Disporum phuhinrongklaensis Sarapan & Chamch., 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-FF9F-9C2D-3A3F-FC26FDADFBE5 |
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treatment provided by |
Felipe |
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scientific name |
Disporum phuhinrongklaensis Sarapan & Chamch. |
| status |
sp. nov. |
5. Disporum phuhinrongklaensis Sarapan & Chamch. , sp. nov. — Fig. 4 View Fig , 5 View Fig , 11 View Fig , 12 View Fig ; Map 1
Disporum phuhinrongklaensis differs from D. calcaratum in its flowers that are rotate and white and green at the apex (vs campanulate and pink or dark purplish red in D. calcaratum ); the ridge of the spur is glabrous (vs papillose in D. calcaratum ); the filaments and style are white (vs pink or purple in D. calcaratum ). — Type: A. Sarapan 40 (holo BKF!; iso BK!, BKF!, K!, KKU!, QBG!), Thailand, Pitsanulok province, Nakhon Thai district, Phu Hin Rong Kla National Park, 2 June 2021.
Etymology. The specific epithet refers to Phu Hin Rong Kla National Park,
Phitsanulok province, where the type specimens were collected .
Perennial erect herbs. Rhizomes short, vertical or horizontal. Aerial stems 40–105 cm long; the lower part 27–57 cm long, green; the upper part 8–54 cm long with 3 ridges, distally 2–6 branched; internodes 3–17 cm long. Cataphylls 2–4, 2.5– 6.5 by 0.4–2 cm, green or pale green. Leaves: lamina narrow-lanceolate to ovate, 6–11 by 1–5 cm, upper surface glabrous, base obtuse, margin dentate, revolute, apex acuminate, veins 4 – 9; petiole absent or short, 1–3 mm long, green. Inflorescences umbellate, 3–8 flowers; peduncle 2–30 mm long, green with purple at proximal and distal ends. Flowers rotate, 10– 20 mm long; pedicel 10 –30 mm long, green with purple at proximal and distal ends. Tepals oblong to narrow-ovate or obovate, 1.4–2 by 0.4–1 cm, keels 1–3, with papillae, white, base glabrous, margin entire, apex green. Spurs straight or recurved with a ridge, 5– 9 mm long, cylindrical or funnel shaped, glabrous, white; ridge membranous, glabrous, white. Stamens 10–15 mm long; filament 7–12 mm long, white, papillose; anther basifixed, yellow. Ovaries obovate or oblong, 8–12 by 2–3 mm, green; style 2–8 mm long, white, glabrous. Fruits globose to oblong, 4–10 by 4–8 mm, green and black when ripening. Seeds 2 – 3, subglobose, brown or light brown, rugose when dried.
Distribution — Endemic in Thailand (Chiang Mai: Si Lanna National Park, Phitsanulok: Phu Hin Rong Kla National Park).
Habitat & Ecology — In open areas or along roadsides of mixed deciduous and evergreen forests at 800–1200 m elevation. Flowering: May to June; fruiting: July to December.
Preliminary IUCN conservation status — A conservation status of Vulnerable (VUD2) is proposed. Disporum phuhinrongklaensis is endemic to Thailand and is known from two localities, each with a small population where a few individuals were observed. The species might occur in other areas in the Phu Hin Rong Kla National Park and Si Lanna National Park. Further exploration is needed.
Anatomical characters — Upper stem: three ridges. Petiole V-shaped with ridges. Leaves: upper epidermal cells above costal zone with echinate cuticles and intercostal zone with smooth cuticles ( Fig. 4a View Fig ); lower epidermal cells of costal zone with echinate cuticles ( Fig. 4f View Fig ) and intercostal zone with smooth cuticles; margin revolute; anticlinal walls of adaxial epidermis sinuate ( Fig. 4k View Fig ).
Pollen morphological characters — For polar and equatorial views see Fig. 5q, r View Fig .
Pollen in equatorial view with bilateral symmetry, subspheroidal (P/E = 1.20–1.32 µm), medium-sized (35–37 by 28–30 µm). Aperture monosulcate ( Fig. 5s View Fig ). Exine 1–3 ± 0.53 µm thick; ornamentation rugulate with granulate surface ( Fig. 5t View Fig ).
Note — Disporum phuhinrongklaensis is similar to D. calcaratum as they share a long and straight spur. However, they differ in a number of respects, see Table 4.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.