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Tên Khoa học: Vanilla atropogon Schuit., Aver. & Rybkova
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MÔ TẢ CHUNG

Vanilla atropogon

Epiphytic or lithophytic, creeping or climbing, branching vine to 15 m long. Stem fleshy, 5–9 mm diam., internodes 3.5–9.5 cm long. Roots 1.5 mm diam. Leaves shortly petiolate; petiole c. 7 by 4 mm, with incurved margins; blade narrowly ovate-elliptic, 12–17 by 4.2–4.7 cm, acuminate, carnose; terminal leaf at base of inflorescence much smaller, c. 3.5 cm long. Inflorescence terminal, subsessile, 10–15 cm long, with 10–23 spirally arranged flowers, c. 9 mm apart, opening in succession; rachis slightly flexuose, c. 7 mm diam. Floral bracts oblong, 6–12 mm long, acute, slightly cucullate. Pedicel-with-ovary straight or slightly curved, 3–4 cm long, terete, green, pure white in basal 4 mm. Flowers opening widely, c. 4.5 cm wide, foul-smelling; sepals yellowish green, white at the very base; petals paler green; lip ground colour white tinged pale green, at c. 1.2 mm from the margin with a broad band of irregular, confluent maroon blotches; the very margins finely edged with maroon; in the central part, but not in front of the central callus, with smaller maroon spots and stripes; on either side of the central callus with a series of short, transverse maroon lines; hairs on the mid-lobe maroon in their basal half, pinkish white in their apical half; central callus-like patch of scales whitish grading to pinkish purple towards the lip apex; column and anther whitish. Dorsal sepal narrowly oblong-elliptic, 3.1 × 0.9 cm, concave, carnose, obtuse. Lateral sepals elliptic, 2.8 × 1.1 cm, concave, carnose, obtuse. Petals elliptic, 3.2 × 1.2 cm, outside keeled along the midvein, thinner textured than the sepals, apical margins slightly erose, obtuse. Lip 3-lobed; basal part narrow, adnate to the sides of the column, 1.2 cm long, forming a tubular structure; free part 2.3 × 2.4 cm when flattened; lateral lobes semi-orbicular, 1.0 cm long, margins erose, apex broadly rounded, at the base with numerous, irregular, parallel, low ridges at an acute angle to the median line, between the lobes with an oblong, 5.5 mm long central callus consisting of a patch of numerous pilose-fimbriate, backwards-pointing, imbricate scales; mid-lobe semi-orbicular, 1.3 × 1.5 cm, margins crispate, apex truncate, emarginate, in the centre with a large patch of numerous, c. 4 mmlong, subulate hairs. Column slender, slightly curved towards the apex, 1.7 cm long, glabrous; rostellum truncate, fleshy; clinandrium with erose margins and two short stelidia. Anther hood-shaped, glabrous, 3 × 2.5 mm

ẢNH

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

CHỈ SỐ

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