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Tên Khoa học: Aporosa tetragona Tagane & V. S. Dang
Tên tiếng Anh:
Tên tiếng Việt: Tai nghé hòn bà
Tên khác:

MÔ TẢ CHUNG

Type

VIETNAM. Khanh Hoa Province, Mt. Hon Ba, edge of evergreen forest near stream, 12°06'30.60"N, 108°59'15.70"E, alt. 393 m, 22 November 2014, with female fl. and fr., Toyama H., Tagane S., Dang. V. S., Nagamasu H., Naiki A., Tran H., Yang C. J. V1976 (holotype KYO!, isotypes BKF!, FU!, K, NTU!, P, VNM!, the herbarium of Hon Ba Nature Reserve!).

Description

Small tree, 3 m tall. Twigs glabrous, young branchlets green in vivo, dull yellowish green to pale yellow in sicco, old branchlets light grayish brown. Stipules caducous, not seen. Leaves: petiole 0.8–1.7 cm long, sunken above, rounded below, pulvini distinct, glabrous; blade ovate to elliptic, (6.8–)9–16.5 × 3.9–7.0 cm, length/width ratio 2.0–2.9, chartaceous to subcoriaceus, completely glabrous, dull yellowish green to dull pale yellow above and beneath in sicco, base cuneate to rounded, or shallowly subcordate, basal glands present, margin entire, foliar glands abaxially scattered mostly within the arches of the marginal veins, apex acuminate, acumen up to 2.3 mm long; midrib prominent on both surfaces, or rarely sunken only on the upper surface, secondary veins 10–14 pairs, raised on the lower surface, tertiary veins reticulate, visible on both surfaces of young leaves in sicco, inconspicuous on lower surface of old leaves. Staminate inflorescences not seen. Pistillate inflorescences in axils of leaves near the top of branchlets, solitary, flowers up to 7, rachis 2–5 mm long, densely pubescent; bracts broadly triangular, ca. 1 × 1.1 mm, margin ciliate, very sparsely pubescent outside, glabrous inside. Pistillate flowers (6–)8–10 mm long, (1.8–)2.5–3 mm in diam., sessile, yellowish in vivo, reddish brown in sicco; sepals 4, triangular, 0.8–1.1 × 1.1 mm, glabrous to very sparsely hairy outside, glabrous inside except near base, margin ciliate; ovary obclavate, 5–9 mm long, tetragonal, 2-locular, glabrous outside; ovules 2 per locule; stigmas slightly raised, elongated, ascending from the top of the ovary, stigma bilobed, lobes ca. 0.6–1 mm long, each stigma lobe apically deeply bifid, papillate and hairless above, smooth and very sparsely hairy beneath, style remnant present. Fruits tetragonal ellipsoid with sharp ridges, 21–25 × 7–9 mm, stiped, beaked, fleshy, reddish in vivo, pinkish orange to reddish brown in sicco, glabrous; septae and column pubescent with hairs of 0.4–0.6 mm long. Seeds 2 or 3, ellipsoid, flattened, ca. 9.0 × 5.0 × 3.5–4 mm, covered by fleshy, yellow aril in vivo, yellowish brown in sicco.

Other specimen examined

Vietnam. Khanh Hoa Province, Mt. Hon Ba, in evergreen forest near river, 12°06'33.41"N, 108°59'24.89"E, alt. 367 m, 19 Feb. 2014, with female fl., Toyama et al. V829 (FU!, VNM!, the herbarium of Hon Ba Nature Reserve!).

Phenology

Flowering specimens were collected in July and November; fruiting in November.

Distribution and habitat

This species is currently known only from Hon Ba Nature Reserve, Khanh Hoa Province, South Vietnam. The small populations were found at the edge of humid broad-leaved evergreen forest close to a stream, altitude 200–400 m.

Etymology

The specific epithet tetragona reflects the quadrangular shape of the ovaries in the pistillate flowers and fruits.

Gen Bank accession No

Toya ma et al. V1976: LC050338 (rbcL), LC050339 (matK).

Conservation status

The species is known only from the type locality in Mt. Hon Ba at 200–400 m altitude. It is suggested that Aporosa tetragona should be placed under the IUCN category ‘Critically Endangered’ (CR) (IUCN 2012) because of its limited distribution with an area of occupancy estimated to be less than 10 km2 (criterion B2 a) and a small number of individuals estimated to be less than 250. Recent botanical inventories carried out in this narrow area along stream discovered several new species, including Dillenia tetrapetala Joongku Lee, T. B. Tran & R. K. Choudhary (Choudhary et al. 2012), Goniothalamus flagellistylus Tagane & V. S. Dang (Tagane et al. 2015) and Vanilla atropogon Schuit., Aver. & Rybková (Schuiteman et al. 2012), all of which are rare and endemic to Mt. Hon Ba. Therefore further collection efforts around this area are necessary to accurately understand the flora there and to update the conservation status of the species.

 

ẢNH

Aporosa tetragona - Dang Van Son.jpg at www.BotanyVN.com

Ảnh 1. Aporosa tetragona - Dang Van Son.jpg

 

Aporosa tetragona - PhytoKeys 57 - Tagane and V.S.Dang - 2.jpg at www.BotanyVN.com

Ảnh 2. Aporosa tetragona - PhytoKeys 57 - Tagane and V.S.Dang - 2.jpg

 

aporosa tetragona - PhytoKeys 57 - Tagane and V.S.Dang -1.jpg at www.BotanyVN.com

Ảnh 3. aporosa tetragona - PhytoKeys 57 - Tagane and V.S.Dang -1.jpg

 

PHÂN LOẠI KHOA HỌC
Giới: Thực vật
Ngành: Magnoliophyta
Lớp: Magnoliopsida
Bộ: Malpighiales
Họ: Euphorbiaceae
Chi: Aporosa

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