Disporum chiangdaoense Sarapan & Suwanph., 2024
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publication ID |
https://doi.org/10.3767/blumea.2024.69.02.04 |
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persistent identifier |
https://treatment.plazi.org/id/03D31809-FF99-9C35-3970-FB5CFE7BF924 |
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treatment provided by |
Felipe |
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scientific name |
Disporum chiangdaoense Sarapan & Suwanph. |
| status |
sp. nov. |
3. Disporum chiangdaoense Sarapan & Suwanph. , sp. nov. — Fig. 3 View Fig , 4 View Fig , 5 View Fig , 7 View Fig , 8 View Fig ; Map 1
Disporum chiangdaoense differs from D. calcaratum in its perianth that is white and green or cream at apex (vs pink and purple in D. calcaratum ) and the ridge of the spur is glabrous (vs papillose in D. calcaratum ). — Type: A. Sarapan 46 (holo BKF!;iso BK!, BKF!, K!, KKU!, QBG!), Thailand, Chiang Mai province, Chiangdao district, Chiangdao Wildlife Sanctuary , 10 June 2021 .
Etymology. The specific epithet refers to Chiangdao Wildlife Sanctuary,
Chiang Mai Province, where the type specimens were collected .
Perennial erect herbs. Rhizomes horizontal. Aerial stems 15– 94 cm long; the lower part 15–68 cm long, purple; the upper part 7–25 cm long with 4 ridges; simple or distally 2–4 branched; internode 1.5 – 20 cm long. Cataphylls 4 – 6, 1.2–6.5 by 0.5–2.5 cm, light or dark brown. Leaves: lamina narrow-lanceolate to elliptic or ovate, 2–10 by 1–3.5 cm, upper surface glabrous, base obtuse, margin dentate, revolute, dark purple, apex acuminate, veins 5–8; petiole ± absent or very short, 1–3 mm long, green. Inflorescences umbellate, 2–8 flowers; peduncle 1–20 mm long, green with purple at proximal and distal ends. Flowers campanulate, 10– 30 mm long; pedicel 10–25 mm long, green with purple at proximal and distal ends. Tepals oblong to obovate, 1.4–2.3 by 0.5–0.6 cm, 1–3 keeled with papillae, white, base glabrous, margin dentate, apex green or cream. Spurs straight or recurved with a ridge, 5 –10 mm long, cylindrical or funnel-shaped, glabrous, white; ridge membranous, glabrous, white. Stamens 10–13 mm long; filament 4–10 mm long white, papillose; anther basifixed, yellow. Ovaries obovate or oblong, 13–15 by 2 –3 mm, green; style 3–12 mm long, white, glabrous. Fruits globose, 4 – 6 by 3–6 mm, blue or dark blue when ripe. Seeds 2– 4, subglobose or triangular, brown or light brown, surface rough when dried.
Distribution — Endemic to Thailand (Provinces: Mae Hong Son (Mueang District); Chiang Mai (Chiangdao Wildlife Sanctuary)).
Habitat & Ecology — In open areas or along roadsides of evergreen forest at 1200–2000 m elevation. Flowering: June to July; fruiting: August to February.
Preliminary IUCN conservation status — A conservation status of Vulnerable (VUD2) is proposed. Disporum chiangdaoense is endemic to Thailand and was collected from two localities, each with a small population. The species occurs in the Chiang Dao Wildlife Sanctuary that is a protected area and Hmong Microwave Village in Mae Hong Son province. Further exploration is needed.
Anatomical characters — Upper stem: four ridges ( Fig. 3b View Fig ). Petiole U-shaped, without ridges ( Fig. 3e View Fig ). Leaves: upper epidermal cells above costal and intercostal zones with echinate cuticles; lower epidermal cells of costal zone with echinate cuticles ( Fig. 4d View Fig ) and intercostal zone with smooth cuticles; margin revolute; anticlinal walls of adaxial epidermis sinuate ( Fig. 4i View Fig ).
Pollen morphological characters — For polar and equatorial views see Fig. 5i, j View Fig .
Pollen in equatorial view asymmetrical, subspheroidal (P/E = 1.10–1.15 µm), medium-sized (42–44 by 38–40 µm). Aperture triporate ( Fig. 5k View Fig ). Exine 1–3 ± 0.56 µm thick; ornamentation rugulate with perforate surface ( Fig. 5l View Fig ).
Note — Disporum chiangdaoense resembles D. calcaratum ; both have campanulate flowers. However, they differ in several respects.A summary of the differences in morphology, anatomy and pollen morphologies between D. chiangdaoense and D. calcaratum is shown in Table 2.
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