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LOÀI

Tên Khoa học: Dendrobium draconis Reichb.f.
Tên tiếng Anh:
Tên tiếng Việt: Nhất điểm hồng
Tên khác:

MÔ TẢ CHUNG

Typus. — Myanmar. Moulmein, Parish 131, 132b, Herb. Reichen-bach 32379 (holo-, W).

Habitat, phenology and conservation status.

Epiphyte  on tall trees in primary and secondary dry lowland evergreen and  semi-deciduous forests and woodlands, often on thin ferralitic  soils. 200-1000 m. Fl. January-May.

Rare.

Expected IUCN Red  List status - EN.

Distribution.

Cambodia (Kampong Speu, Kampong Thom,  Steung Treng), Laos (Attopeu, Champasak, Savannakhet, Vientiane

Vietnam (Da Nang, Dak Lak, Khanh Hoa, Lam Dong). NE India,  Myanmar, Thailand.

Description

Stems cylindrical to narrowly fusiform, (10)15-40(50) cm  long, 0.8-1.5 cm in diameter, of many nodes. Leaves ovate  to oblong narrowly ovate, 5-10 cm long, 1.5-2.5 cm wide.  Inflorescences 1-4(5), each with 1-3(5) flowers. Pedicel and  ovary 2.5-3.5 cm long. Flowers tangerine fragrant, widely  opening, 4-6 cm across, white, disc and base of the lip bright  red, sometimes adaxially yellow. Sepals and petals narrowly  ovate, acute 2.5-3.5 cm long, 0.6-1 cm wide; petals slightly  wider; mentum narrowly conical to cylindrical, spur-like,  curved, 2-2.5 cm long, 2-4 mm in diameter. Lip narrowly  ovate, 3-lobed, slightly shorter than sepals, 1.4-1.6 cm wide;  side lobes small, half circular, as long as column; median lobe  narrowly ovate to ovate, acute to acuminate, much longer  than side lobes, strongly undulate and irregularly denticulate  along margin; disc with 3-5 low indistinct verruculose keels.  Column white, 7-9 mm tall (Fig. 1H).

Remark

In the past, it was the most common species of the section all  over southern Indochina. Presently it has become endangered  in all countries of the region due to wide deforestation and  degradation of its native habitats at low elevations

ẢNH

Dendrobium draconis - Leonid et al. on ADANSONIA 2016 38 (2).jpg at www.BotanyVN.com

Ảnh 1. Dendrobium draconis - Leonid et al. on ADANSONIA 2016 38 (2).jpg

 

PHÂN LOẠI KHOA HỌC
Giới: Thực vật
Ngành: Magnoliophyta
Lớp: Liliopsida
Bộ: Orchidales
Họ: Orchidaceae
Chi: Dendrobium

CHỈ SỐ

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