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Tên Khoa học: Hoya tamdaoensis Rodda & T.B.Tran
Tên tiếng Anh:
Tên tiếng Việt: Cẩm cù tam đảo
Tên khác:


Lithophytic climber with white exudate in all vegetative parts, glabrous, except young stems sparsely pubescent with retrorse hairs. Stems slender, internodes (5—)8—12(—15) cm x 1.5-3 mm, dark green to brownish purple; adventitious root sparsely produced along the stem. Leaves wine-red when young; petiole recurved, held at an almost right angle to the lamina, 0.8-2 cm x 1.5—2.5 mm, dark green to brownish purple; lamina oblong-lanceolate, (4-)5-10 x (1.5—)2—3 cm, base attenuate-rounded, apex caudate, margin entire, reflexed in older leaves; venation pinnate, secondary veins in 4-7 pairs, borne at 70o-90o to midrib, anastomosing, tertiary venation reticulate, dark green above, glossy with occasional grey spots, midrib depressed above, raised underneath, lighter green with a slightly darker midrib and edge underneath; colleters one at each lamina base, triangular, 0.8-1 X 0.8-1 mm. Inflorescence pseudo-umbellate, convex; peduncle 3-10 cm X 1.8-2.5 mm diam., dark green to purplish brown, glabrous. Flowers (4-)10-15 per inflorescence; pedicel 2-2.5 cm X 0.8-1.2 mm diam., light green, glabrous. Calyx lobes broadly triangular, 1.5-2 X 1-1.5 mm wide, light green with purple spots, glabrous; basal colleter one per calyx lobe sinus, ovate to triangular, 1.5-2 X 1-1.2 mm, apex rounded. Corolla rotate, flat, 1.8-2.2 cm diam., tube 5-6 mm long, thickly pubescent inside, glabrous outside, lobes broadly triangular, 6-8 X 5.5-7 mm, white, margin recurved, apex acute, revolute, thickly pubescent inside with glabrous apex, glabrous outside. Corona staminal, 9-10 mm diam., 4-5 mm high, lobes ovate, 3.5-4.5 X 2.3-2.6 mm, concave above, underneath sulcate with inrolled margins, outer process apex rounded, inner process acuminate. Anthers ovate, ca. 1.3 X 1.2 mm, with apical round membranaceous appendage exceeding the style-head by 0.5-0.7 mm. Pollinia clavate, 650-750 X 270-320 ^m, narrowing towards the base, apex truncate, sterile edge all along the outer edge of the pollinium; corpusculum rhomboid, 300-400 X 180-220 ^m, apex acute; caudicle broad, spathulate, hyaline, ca. 150 X 100 ^m at the widest. Style-head 5-angled in cross section, with 5 lobes alternating with the stamens, style-head apex round, ca. 1 mm long, 2-2.5 mm broad at the base. Ovaries 2, ovate, 1.5-2 mm X ca. 1 mm wide at the base, light green, apex narrow. Fruit and seed not seen.

The new species is named after the collection locality, Tam Đảo National Park, Vietnam.

Distribution and ecology:

Only known from the type locality in Tam Đảo National Park, Vietnam. Hoya tamdaoensis was found growing epilithically on limestone covered by moss in evergreen lower montane forest


Hoya tamdaoensis Rodda et T.B.Tran.jpg at

Ảnh 1. Hoya tamdaoensis Rodda et T.B.Tran.jpg


Hoya tamdaoensis Rodda.jpg at

Ảnh 2. Hoya tamdaoensis Rodda.jpg


Giới: Thực vật
Ngành: Magnoliophyta
Lớp: Magnoliopsida
Bộ: Gentianales
Họ: Asclepiadaceae
Chi: Hoya


BVN - BotanyVN - Botany Research and Development Group of Vietnam
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