taxonID	type	description	language	source
03AD87BFFFEB0C05FF452E2DFC00F934.taxon	materials_examined	Material examined: — Aguascalientes: Calvillo, Jagúey canyon, 3 km E of Piedras Chinas, 1.5 km N of El Zapote de la Labor, 21 ° 58 ’ 46.99 ” N, 102 ° 39 ’ 23.2 ” W, 1969 m, 9 June 2020, E. Ruiz-Sanchez & M. A. García-Martínez 652 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 12 µm length, with axially elongated silica bodies (Fig. 2 B). Cortex with 2 layers of narrow thick-walled cells followed by 3 – 4 layers of thinner-walled rounded cells (5 – 6 layers in total, 70 µm length; Fig. 2 B). Vascular bundles in 8 – 9 alternating cycles (Fig. 2 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 2 C – E). Elliptical central vascular bundles, 488 × 444 μm; two round shaped metaxylem vessels, 98 × 106 µm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 119 × 136 µm; sieve tubes 24 µm × 23 µm (Fig. 2 E). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 70 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 30 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFEB0C02FF452C09FABDFE8E.taxon	materials_examined	Material examined: — MEXICO. Jalisco: San Sebastián del Oeste, Mascota-Puerto Vallarta road, near arch bridge, 20 ° 48 ’ 11 ” N, 104 ° 56 ’ 13 ” W, 725 m, 28 July 2020, E. Ruiz-Sanchez 672 (IBUG!). Culm anatomy description: — Culm solid (Figs. 3 A, B). Epidermis with a layer of rounded lignified cells, 10 µm length, with frequent squared to rectangular silica bodies on top (Fig. 3 C). Cortex with 3 – 4 layers of thick-walled rounded cells, followed by 1 – 2 layers of thinner-walled rounded cells (5 – 6 layers in total, 41 µm length; Fig. 3 C). Vascular bundles in 9 – 10 alternating cycles (Fig. 3 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 3 D – F). Ovate central vascular bundles, 287 × 288 μm; two round shaped metaxylem vessels, 69 × 73 µm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 63 × 75 µm; sieve tubes 19 × 18 µm (Fig. 3 F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 86 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFED0C01FF452C8AFECFFE73.taxon	materials_examined	Material examined: — Oaxaca: Tepelmeme Villa de Morelos, Km 107, Puebla-Oaxaca toll road, Puente Los Otates, 18 ° 1 ’ 53.2 ” N, 97 ° 20 ’ 58.7 ” W, 1961 m, 1 February 2020, E. Ruiz-Sanchez & M. A. García-Martínez 644 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 12 µm length, with frequent silica bodies on top (Fig. 4 C). Cortex with one layer of narrow thick-walled rounded cells followed by 3 – 4 layers of wider thin-walled rounded cells (4 – 5 layers in total, 43 µm wide), the inner ones only with primary walls, chloroplasts and dark staining deposits in some cells (Fig. 4 C). Vascular bundles in 11 – 12 alternating cycles (Fig. 4 A). Peripheral, transitional, and central vascular bundles surrounded by a lignified sclerenchyma sheath defining their contour (Figs. 4 D – F). Cell wall of fiber sheath weakly lignified. Ovate central vascular bundles, 426 × 392 μm; two round shaped metaxylem vessels, 93 × 89 μm, phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 93 × 136 µm; sieve tubes 17 × 21 µm (Fig. 4 F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 49 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 17 µm 2 (Fig. 4 B).	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFEF0C01FF452ACBFE0EFC16.taxon	materials_examined	Material examined: — MEXICO. Veracruz: Emiliano Zapata, 2 km south of Cerro Gordo, 19 ° 25 ’ 17.3 ” N, 96 ° 41 ’ 17.1 ” W, 525 m, 31 January 2020, E. Ruiz-Sanchez & M. A. García-Martínez 643 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 11 µm length, with frequent squared to rectangular silica bodies on top (Fig. 5 C). Cortex with one layer of thick-walled rounded cells followed by 2 – 3 layers of thinner-walled oval to rounded cells (3 – 4 layers in total, 34 µm length; Fig. 5 C). Vascular bundles in 10 – 11 alternating cycles (Fig. 5 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 5 D – F). Elliptical central vascular bundles, 484 × 466 μm; two round shaped metaxylem vessels, 104 × 106 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 66 × 81 µm; sieve tubes 18 µm × 25 µm (Fig. 5 F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 122 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 17 µm 2 (Fig. 5 B).	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFEF0C01FF4528D7FB85FA0E.taxon	materials_examined	Material examined: — MEXICO. Chiapas: Tonalá, La Sepultura, vicinity of Raymundo Flores, 16 ° 1 ’ 57.86 ” N, 93 ° 36 ’ 12.20 ” W, 649 m, 15 February 2022, E. Ruiz-Sanchez et al. 730 (IBUG!). Culm anatomy description: — Culm hollow, the lacuna occupying> 50 % of the total diameter. Epidermis with a layer of axially elongated lignified cells, 14 µm length, with frequent squared to rectangular silica bodies on top (Fig. 6 B). Cortex with 2 layers of narrow thick-walled rounded cells, followed by 3 – 4 layers of wider thinner-walled rounded cells (in total, 5 – 6 layers, 61 µm length; Fig. 6 B). Vascular bundles in 10 – 11 alternating cycles (Fig. 6 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 6 C – E). Cell wall of fiber sheath weakly lignified. Ovate central vascular bundles, 439 × 451 μm; two round shaped metaxylem vessels, 100 × 110 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 91 × 120 µm; sieve tubes 18 × 23 µm (Fig. 6 E). Frequent amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 90 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFEF0C01FF452EDFFE93F822.taxon	materials_examined	Material examined: — MEXICO. Chiapas: Ixtapa, Km 20 toll road Tuxtla Gutiérrez-San Cristóbal de las Casas, 16 ° 41 ’ 53.31 ” N, 92 ° 51 ’ 48.14 ” W, 1300 m, 15 February 2022, E. Ruiz-Sanchez et al. 732 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 12 µm length, with frequent squared to rectangular silica bodies on top (Fig. 7 B). Cortex with 1 – 2 layers of narrow thick-walled rounded cells followed by 4 – 5 layers of wider and thinner-walled rounded cells (6 – 7 layers in total, 73 µm length; Fig. 7 B). Vascular bundles in 11 – 12 alternating cycles (Fig. 7 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 7 C – E). Elliptical central vascular bundles, 556 × 615 μm; two round shaped metaxylem vessels, 119 × 117 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 115 × 195 µm; sieve tubes 20 × 27 µm (Fig. 7 E). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 127 µm 2. Frequent conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 20 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFE20C0AFF452CA3FC6CFE8E.taxon	materials_examined	Material examined: — MEXICO. Chiapas: Motozintla, Km 37 of the Huixtla-Motozintla highway, 15 ° 19 ’ 46.58 ” N, 92 ° 19 ’ 25.72 ” W, 1141 m, 14 February 2022, E. Ruiz-Sanchez et al. 726 (IBUG!). Culm anatomy description: — Culm hollow, the lacuna occupying> 50 % of the total diameter. Epidermis with a layer of axially elongated lignified cells, 12 µm length, with frequent rectangular silica bodies on top (Fig. 8 C). Cortex with 2 layers of narrow thick-walled cells followed by 2 – 3 layers of wider, thinner-walled cells (in total, 4 – 5 layers, 52 µm length; Fig. 8 C). Vascular bundles in 8 – 9 alternating cycles (Fig. 8 A). Peripheral, transitional, and central vascular bundles surrounded by a lignified sclerenchyma sheath defining their contour (Figs. 8 D – F). Cell wall of fiber sheath weakly lignified. Oval central vascular bundles, 462 × 362 μm; two round shaped metaxylem vessels, 89 × 92 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 82 × 104 µm; sieve tubes 18 × 21 µm (Fig. 8 F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 187 µm 2 (Fig. 8 B). Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 6 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFE40C0BFF452A5FFC00FE72.taxon	materials_examined	Material examined: — MEXICO. Querétaro: San Joaquín, along dirt road from Apartadero to San Juan Tetla, 20 ° 58 ’ 56 ” N, 99 ° 29 ’ 28 ” W, 1285 m, 19 February 2022, J. P. Ortíz-Brunel et al. 1395 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 11 µm length, with frequent squared to rectangular silica bodies on top (Fig. 9 B). Cortex with one layer of narrow thick-walled cells followed by 2 – 3 layers of wider thinner-walled rounded cells (in total, 3 – 4 layers, 28 µm length; Fig. 9 B). Vascular bundles in 9 – 10 alternating cycles. Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 9 C – E). Oval central vascular bundles, 275 × 297 μm; two round shaped metaxylem vessels, 77 × 81 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 73 × 97 µm; sieve tubes 20 × 20 µm (Fig. 9 E). Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 26 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFE50C0BFF452ACBFED2FC17.taxon	materials_examined	Material examined: — MEXICO. Michoacán: Morelia, Filtros Viejos, on the banks of the Chiquito river, 19 ° 40 ’ 35.2 ” N, 101 ° 9 ’ 13.7 ” W, 1947 m, 3 February 2020, E. Ruiz-Sanchez & M. A. García-Martínez 649 (IBUG!). Culm anatomy description: — Culm hollow, the lacuna occupying <50 % of the total diameter. Epidermis with a layer of square to rectangular thick-walled cells, 11 µm length, with occasional rectangular silica bodies on top (Fig. 10 C). Cortex with 3 – 4 layers of thick-walled rounded cells, the outer narrower, 27 µm length, with dark staining deposit (Fig. 10 C). Vascular bundles in 5 – 6 alternating cycles (Fig. 10 C). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 10 D – F). Depressed central vascular bundles, 249 × 351 μm; two round shaped metaxylem vessels, 80 × 88 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 56 × 91 µm; sieve tubes 19 × 21 µm (Fig. 10 F). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 78 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 11 µm 2 (Fig. 10 B).	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFE50C0BFF4528D7FDCEFA0F.taxon	materials_examined	Material examined: — MEXICO. Chiapas: Ocozocoautla, El Aguacero waterfall, 16 ° 45 ’ 35.34 ” N, 93 ° 31 ’ 29.32 ” W, 535 m, 15 February 2022, E. Ruiz-Sanchez et al. 731 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 9 µm length, with occasional rectangular silica bodies on top (Fig. 11 C). Cortex with a layer of thick-walled axially elongated cells followed by 2 – 3 layers of wider thinner-walled rounded cells (in total, 3 – 4 layers, 23 µm length; Fig. 11 C). Vascular bundles in 5 – 6 alternating cycles (Fig. 11 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 11 D – F). Central vascular bundles broadly depressed, 180 × 260 µm; two round shaped metaxylem vessels, 63 × 64 µm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 49 × 60 µm, sieve tubes 15 × 14 µm (Fig. 11 F). Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 8 µm 2 (Fig. 11 B). Abundant starch grains in the ground cells (Fig. 11 B).	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFE50C0BFF452EDFFCF0F806.taxon	materials_examined	Material examined: — MEXICO. Colima: Comala, dirt road Campo Cuatro to El Terrero, 19 ° 24 ’ 05 ” N, 103 ° 51 ’ 39 ” W, 1709 m, 25 July 2020, J. P. Ortíz-Brunel et al. 831 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 12 µm length, with frequent squared to rectangular silica bodies on top (Fig. 14 B). Cortex with one layer of narrow thick-walled rounded cells followed by 4 – 5 layers of wider, thinner-walled rounded cells (6 – 7 layers in total, 72 µm length; Fig. 14 B). Vascular bundles in 10 – 11 alternating cycles (Fig. 14 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 14 C – E). Cell wall of fiber sheath weakly lignified. Elliptical central vascular bundles, 468 × 269 μm; two round shaped metaxylem vessels, 77 × 79 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 101 × 106 µm; sieve tubes 17 × 24 µm (Fig. 14 E). Frequent amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 54 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFF90C14FF452BB7FA43FE72.taxon	materials_examined	Material examined: — MEXICO. Hidalgo: Cardonal, Tolantongo-Metztitlán dirt road, 5 km east of the junction to the road that leads to Tolantongo, 20 ° 37 ’ 38.1 ” N, 98 ° 57 ’ 31.3 ” W, 1775 m, 2 February 2020, E. Ruiz-Sanchez & M. A. García-Martínez 647 (IBUG!). Culm anatomy description: — Culm hollow with wide lacuna occupying> 50 % of the total diameter. Epidermis with a layer of axially elongated lignified cells, 15 µm length, with frequent squared to rectangular silica bodies on top (Fig. 15 B). Cortex with 3 – 5 layers of thick-walled rounded cells, the outer layer with slightly narrower cells (48 µm length; Fig. 15 B). Vascular bundles in 9 – 10 alternating cycles. Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 15 C – E). Ovate central vascular bundles, 357 × 353 μm; two round shaped metaxylem vessels, 81 × 87 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 87 × 104 µm; sieve tubes 22 × 21 µm (Fig. 15 A). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 58 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 9 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFFA0C14FF452EFBFB01F807.taxon	materials_examined	Material examined: — MEXICO. Jalisco: Puerto Vallarta, 100 m upstream of Palo María river, 20 ° 33 ’ 4.14 ” N, 105 ° 15 ’ 24.48 ” W, 50 m, 10 December 2021, E. Ruiz-Sanchez 723 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 22 µm length, with frequent squared to rectangular silica bodies on top (Fig. 13 B). Cortex with 3 – 4 layers of strongly thickerwalled rounded cells, 84 µm length (Fig. 13 B). Vascular bundles in 9 – 10 alternating cycles (Fig. 13 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 13 C – E). Elliptical central vascular bundles 445 × 315 μm; two round shaped metaxylem vessels, 118 × 105 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 108 × 104 µm; sieve tubes 16 × 28 µm (Fig. 13 E). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 173 µm 2. Sporadic conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 26 µm 2. We here present a key to Mexican Otatea species based on anatomical cross-section characters.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFFA0C14FF4528F3FF56FA62.taxon	materials_examined	Material examined: — Chiapas: Arriaga, Km 13 toll road Tuxtla-Arriaga, 16 ° 19 ’ 13.50 ” N, 93 ° 51 ’ 22.8 ” W, 564 m, 14 February 2022, E. Ruiz-Sanchez et al. 724 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated thick-walled cells, 17 µm length, with frequent squared to rectangular silica bodies on top (Fig. 12 B). Cortex with a layer of narrow thick-walled rounded cells followed by 2 layers of wider, thinner-walled ovoidal cells (3 layers in total, 27 µm length; Fig. 12 B). Vascular bundles in 10 – 11 alternating cycles (Fig. 12 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 12 C – E). Ovate central vascular bundles, 336 × 331 μm; two round shaped metaxylem vessels, 89 × 98 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 73 × 98 µm; sieve tubes 23 × 21 µm (Fig. 12 E). Scarce amorphous silica bodies embedded along the periphery of vascular bundles occupying cellular spaces covering a mean area of 168 µm 2.	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
03AD87BFFFFA0C14FF452ACBFEEFFC6B.taxon	materials_examined	Material examined: — MEXICO. Oaxaca: Asunción Nochixtlán, Km 190 of the Puebla-Oaxaca highway, 17 ° 23 ’ 9.1 ” N, 97 ° 8 ’ 8.9 ” W 1928 m, 2 February 2020, Ruiz-Sanchez & M. A. García-Martínez 645 (IBUG!). Culm anatomy description: — Culm solid. Epidermis with a layer of axially elongated lignified cells, 12 µm length, with occasional rectangular silica bodies on top (Fig. 16 C). Cortex with one layer of thick-walled cells followed by 2 layers of wider, thinner-walled ovoidal cells (3 layers in total, 30 µm length; Fig. 16 C). Vascular bundles in 5 – 6 alternating cycles (Fig. 16 A). Peripheral, transitional, and central vascular bundles surrounded by a sclerenchyma sheath defining their contour (Figs. 16 D – F). Ovate central vascular bundles, 309 × 304 μm; two round shaped metaxylem vessels, 75 × 83 μm; phloem with sieve tubes and companion cells located between two metaxylem vessels on the upper level, 78 × 98 µm; sieve tubes 19 × 20 µm (Fig. 16 F). Ground parenchyma with abundant starch grains. Frequent conical silica bodies across the ground tissue occupying intercellular spaces covering a mean area of 10 µm 2 (Fig. 16 B).	en	García-Martínez, Miguel A., Terrazas, Teresa, Sánchez, Daniel, Reyes, Pablo Carrillo-, Ruiz-Sanchez, Eduardo (2023): Culm anatomy of the genus Otatea (Poaceae, Bambusoideae, Bambuseae, Guaduinae) as a contribution to Mexican species identification. Phytotaxa 609 (2): 75-102, DOI: 10.11646/phytotaxa.609.2.1, URL: http://dx.doi.org/10.11646/phytotaxa.609.2.1
