Calea strigosa V.R.Bueno, Prata-Silveira & Bentes, 2025

Bueno, Vinícius R., Bentes, Marina Soares, Ramos, Renato, Zavatin, Danilo A. & Prata-Silveira, Ananda, 2025, Three new species of Calea (Asteraceae, Neurolaeneae) from the sky islands of the Espinhaço Range, Phytotaxa 689 (2), pp. 185-203 : 193-196

Calea strigosa V.R.Bueno, Prata-Silveira & Bentes , sp. nov.

Type:— BRAZIL. Minas Gerais: Rio Pardo de Minas, Parque Estadual de Serra Nova e Talhado , trilha em direção à casa de apoio, 15°38’50”S, 42°44’22”W, 27 August 2019 (fl., fr.), V. S. Miranda 543 (holotype: VIES!; isotype MCCA!). ( Figs. 6 , 7 )

Diagnosis: — Calea strigosa is morphologically similar to C. sessilifolia , but can be individualized by being 0.4–1.0 m tall (vs. 0.1–0.25 m), base subcordate (vs. rounded), abaxial surface strigose of leaves and two outermost series (vs. without tector trichomes), involucre 6-seriate (vs. 5-seriate), ray floret corolla 14–15.1 mm long (vs. 10.9–11.9 mm), and disc floret corolla 6.3–7.1 mm long (vs. 4.3–5.8 mm).

Shrubby or herb habit, erect, slightly branched or unbranched, 0.4–1.0 m tall. Stems castaneous, cylindrical, non-striate, densely strigose to strigose, sometimes strigose, internodes 1.25–7.04 (–9.41–12.39) cm long. Leaves decussate, petiole 0.2–0.8 mm long or sessile; blades 0.82–2.66 × 0.58–2.03 cm, ovate or elliptic, often very wide ovate to wide ovate, sometimes orbiculate to suborbiculate, base subcordate, apex obtuse, sometimes acuminate, venation acrodromous basal, margin serrate, 1–6 teeth, 0.3–0.7 mm long, from the middle to apex leaf, rarely along the leaf, revolute; abaxial surface strigose, sometimes strigillose, veins densely strigose to strigose, sometimes strigillose, densely glandular-foveolate, adaxial surface strigose, sometimes sparsely strigose, densely glandular-foveolate; chartaceous, green, concolorous or slightly discolorous. Capitulescence cymose, axis 0–12.4 cm long, branching to 2 nd order ramifications, rarely 3 nd order, 2–4 secondary stems, sometimes monocephalous; peduncle 1.87–5.68 (–7.02) cm long, sparsely pilose to densely pilose, often glandular-punctate. Capitulum heterogamous, radiate, involucrum wide cylindrical or campanulate 9.5–14.5 × 9.7–13.7 mm, 6-seriate; two outermost series of phyllaries foliaceous, green, margin entire, green, strigose, sparsely glandular-punctate, first series blade 4–4.7 × 3.3–3.6 mm, suborbiculate to wide elliptic, apex obtuse, rarely acuminate, apically revolute, 1–3-striate; second series blade 4.8–5 × 4.2–4.6 mm, suborbiculate to orbiculate, apex obtuse, rarely acuminate, flat or rarely apically revolute, 8–10-striate; innermost series of phyllaries scarious, greenish to pale yellow, glabrous, margin entire, green, flat, third series blade 5.4–6.3 × 3.8–4.3 mm, ovate, apex rounded, 8–10-striate; fourth series blade 7.7–8.6 × 4.6–5.2 mm, ovate, apex rounded, 14–15- striate; fifth series blade 9.3–9.8 × 4.2–4.9 mm, oblong, apex rounded, sometimes obtuse, margin ciliate to sparsely ciliate, 9–14-striate; sixth series blade 9.2–10 × 2–3 mm, narrow elliptic, apex obtuse, 5–6-striate. Receptacle convex, holopaleaceous, paleae 8.4–11.2 × 2.4–3 mm, narrow oblong to narrow oblanceolate, concave, apex acuminate, yellow. Ray florets 8–10, pistillate, corolla liguliform, 14–15.1 mm long, tube 4.2–4.5 mm long, limb 9.8–10.6 × 2.8–2.9 mm, narrow oblong, apex 3-lobulate, 5 veins, yellow, abaxial surface glandular-punctate, adaxial surface glabrous; style arms 1.4–1.5 mm long, yellow. Disc florets 25–30, bisexual, corolla tubulose, 6.3–7.1 mm long, tube 2.1–2.8 mm long, lobes 0.7–1.6 mm long, yellow, sparsely glandular-punctate; anthers 2.8–3.3 mm long, apical anther appendages ovate, yellow; style arms 1.4–1.5 mm long, linear, yellow. Cypselae 3.2–4.1 mm long, black with golden angles, prismatics, ray cypselae 3-angled, disc cypselae 4-angled, glabrous to pilose, ribs pilose to densely pilose; pappus 9–12 scales, monotypic, polylength, free, uniseriate, shorter scales 1.7–2.8 mm long, medium scales 2.6–3.6 mm long, longer scales 3.3–4 mm long, linear, sometimes lanceolate, apex acuminate, margins entire, erose.

Etymology: — The epithet “strigosa ” refers to the strigose indument of the stems, abaxial leaf surface, and outer involucral phyllaries of the new species.

Distribution, habitat and phenology: — Calea strigosa , like C. riopardensis , is endemic to the municipality of Rio Pardo de Minas, Minas Gerais, Brazil ( Fig. 7 ). Calea strigosa grows in campo rupestre areas ( Miola et al. 2021) associated with sandy soils and rock outcrops in elevations around 1300–1350 m a.s.l.. The specimens were collected in August with florets and fruits.

Conservation Status: — Calea strigosa is indicated as Vulnerable ( VU), due to the same aspects shown for C. riopardensis .

Paratypes: — BRAZIL. Minas Gerais: Rio Pardo de Minas, Parque Estadual de Serra Nova e Talhado , trilha principal, 27 August 2019 (fl., fr.), Q. S. Moraes 345 ( MCCA3649 ; VIES045481 ) ; Minas Gerais: Rio Pardo de Minas, Parque Estadual de Serra Nova e Talhado , trilha em direção à casa de apoio, 15°38’50”S, 42°44’22”W, 27 August 2019 (fl., fr.), P. H. D. Barros 374 ( VIES045400 ) ; Minas Gerais: Rio Pardo de Minas, Parque Estadual de Serra Nova e Talhado , trilha em direção à casa de apoio, 15°38’50”S, 42°44’22”W, 27 August 2019 (fl., fr.), V. S. Miranda 543 ( MCCA3563 ; VIES045395 ) ;

Selected material examined from another species of Calea sickii group: — Calea diamantinensis . BRAZIL. Minas Gerais: Diamantina, estrada Diamantina para Conselheiro Mata, km 187, 18°16’29”S, 43°42’46”W, 24 September 2008, (fl., fr.), R. Romero, A. I. M. R. Machado, D. J. P. Gonçalves, F. S. Freitas & P. N. Soares 8164 ( HUFU 00060301). Calea grazielae . BRAZIL. Minas Gerais: Santana do Riacho, Serra do Cipó, km 108 da rodovia MG 010, 19°17’04.0”S, 43°35’18.0”W, 31 May 2007, (fl., fr.), M. A. Pena 310 ( ICN 00054335). Calea intermedia . BRAZIL. Minas Gerais: Várzea da Palma, Serra do Cabral, Agroindustrial Serra do Cabral, 20 May 2001, (fl., fr.), G. Hatschbach 72253 ( HUFU 00043681). Calea irwinii . BRAZIL. Goiás: Alto Paraíso de Goiás, 10 km W de Alto Paraíso, 24 March 1974, (fl., fr.), H. Irwin 25002 ( US 00131343). Calea repanda . BRAZIL. Minas Gerais: Rio Pardo de Minas, Serra Nova, sítio 25,15°38’03.0” S 42°42’51.0”W, 23 July 2017, (fl., fr.), A. C. Sevilha 7016 ( CEN 00104193). Calea sessilifolia . BRAZIL. Minas Gerais: Diamantina, Guinda , campo limpo úmido após a mineração Maracanã, 18°17’53”S, 43°44’09”W, 14 December 2023, (fl., fr.), J. Ordones, C. A. F. Ferreira Jr., T. Otoni & L. Brandão 2886 ( BHZB 00003527). Calea sickii . BRAZIL. Distrito Federal: Brasília, reserva do Jardim Botânico, Morro do Cristo, 15°55’05.0”S, 47°53’33.0”W, 14 March 2019, (fl., fr.), V. R. Bueno, A. C. A. Soares & P. O. Rosa 104 ( ICN 00054521).

Figures

FIGURE 6. Calea strigosa sp. nov. (Neurolaeneae,Asteraceae).A. Flowering branch. B. Leaf with pauciserrate margins, adaxial surface. C. Capitulum with ray florets removed to show involucre, paleae and disc floret arrangements. D. Phyllary of the first series. E. Phyllary of the second series. F. Phyllary of the third series. G. Phyllary of the fourth series. H. Phyllary of the fifth series. I. Phyllary of the sixth series. J. Ray floret with pappus removed to show the tube floret. K. Disc floret with pappus removed to show the tube floret. L. Cypsela with polylength pappus scales.A–L drawn from V. S. Miranda 543 (VIES); A–L: millimeter scale. Illustration by Débora Dalzotto.

FIGURE 7. Calea strigosa sp. nov. (Neurolaeneae, Asteraceae) A. Plant in the habitat. B. Capitulum magnification. Image autorship: V.S.Miranda.