Disporum scabridum Sarapan & Hodk., 2024

Sarapan, A., Chamchumroon, V., Hodkinson, T. R. & Suwanphakdee, C., 2024, Taxonomic revision of Disporum (Colchicaceae) from Thailand including four new species, Blumea 69 (2), pp. 139-160 : 159

publication ID

https://doi.org/10.3767/blumea.2024.69.02.04

persistent identifier

https://treatment.plazi.org/id/03D31809-FF84-9C2D-3A3F-FB94FAD6FA7A

treatment provided by

Felipe

scientific name

Disporum scabridum Sarapan & Hodk.
status

sp. nov.

6. Disporum scabridum Sarapan & Hodk. , sp. nov. — Fig. 3 View Fig , 4 View Fig , 5 View Fig , 13 View Fig , 14 View Fig ; Map 1

Disporum scabridum differs from D. calcaratum in its flowers that are tubulate to campanulate with a deep purple red apex (vs campanulate with pink or pale pink apex in D. calcaratum ); the basal tepal and spur are densely scabrous (vs glabrous in D. calcaratum ). — Type: A. Sarapan 8 (holo BKF!; iso BK!, BKF!, K!, KKU!, QBG!), Thailand, Phitsanulok province, Nakhon Thai district,Phu Hin Rong Kla National Park, Mhan Daeng Waterfall, 7 July 2021.

Etymology. The specific epithet refers to the densely scabrous spur that is characteristic of the species.

Perennial erect herbs. Rhizomes short, vertical or horizontal. Aerial stems 45–100 cm long; the lower part 68–73 cm long, green; the upper 20– 50 cm long with 2 ridges; simple or usually distally 2–3-branched; internode 1–20 cm long. Cataphylls 4–5, 4–5.5 by 0.6–1.2 cm, reddish brown. Leaves: lamina lanceolate, elliptic or ovate, 11–16 by 0.3–0.5 cm, upper surface glabrous, base obtuse, margin dentate, involute, dark purple, apex acuminate, veins 3–8; petiole absent or short, 2–10 mm long, green. Inflorescences umbellate, 3–7 flowers; peduncle 4–10 mm long, green. Flowers tubulate to campanulate, 12– 20 mm long; pedicel 4 – 20 mm long, green with purple at proximal and distal ends. Tepals lanceolate to obovate, 2–2.2 by 0.4–0.6 cm, 1–3 keels with papillae, dark red to light pure red or deep red with a slight tinge of purple, base densely scabrous on both sides, margin dentate, apex dark dull red. Spurs straight or recurved with a ridge, 5–7 mm long, cylindrical or funnel shaped, densely scabrous, dark red; ridges membranous, densely scabrous or papillose, dark dull red. Stamens 12–14 mm long; filament 8–12 mm long, white or green, densely papillate; anther basifixed, yellow. Ovaries oblong or obovate to oblong, 12 –14 by 2– 3 mm; style 6 –10 mm long, dark purplish red, papillose. Fruits globose, 4–6 by 3–7 mm, green and black when ripening. Seeds 2 – 4, subglobose or triangular, light brown to brown, rough surface when dried.

Distribution — Endemic to Thailand (Pitsanulok: Phu Hin Rong Kla National Park).

Habitat & Ecology — In open areas and along roadsides of mix deciduous or evergreen forests at 1000–1800 m elevation. Flowering: June to July; fruiting: July to November.

Preliminary IUCN conservation status — A conservation status of Vulnerable (VUD1) is proposed. Disporum scabridum is endemic to Thailand and is known only from one small population where a few individuals were observed. The species might occur in other areas in the Phu Hin Rong Kla National Park. Further exploration is needed.

Anatomical characters — Upper stem: two ridges. Petiole V-shaped with ridges. Leaves: upper epidermal cells above costal and intercostal zones ( Fig. 3j View Fig ) with smooth cuticles ( Fig. 4b View Fig ); lower epidermal cells of costal and intercostal zones with smooth cuticles; margin involute ( Fig. 3h View Fig ); anticlinal walls of adaxial epidermis sinuate ( Fig. 4l View Fig ).

Pollen morphological characters — For polar and equatorial views see Fig. 5u, v View Fig . Pollen in equatorial view with bilateral symmetry, spheroidal (P/E = 1.02–1.10 µm), medium-sized (39–41 by 37–39 µm). Aperture 2-porate ( Fig. 5w View Fig ). Exine 2 –3 ± 0.48 µm thick; ornamentation rugulate with granulate surface ( Fig. 5x View Fig ).

Note — Morphologically, Disporum scabridum is similar to

D. calcaratum ; the differences are shown in Table 5.

Kingdom

Plantae

Phylum

Tracheophyta

Class

Liliopsida

Order

Liliales

Family

Colchicaceae

Genus

Disporum

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