Phaius baolocensis, Nong & Chen & Zhang, 2012

Nong, Van Duy, Chen, Tao & Zhang, Dianxiang, 2012, Phaius baolocensis sp. nov. (Orchidaceae), a new species endemic to the southern highlands of Vietnam, Adansonia (3) 34 (2), pp. 251-255 : 252-254

Phaius baolocensis

N.V.Duy, T.Chen & D.X.Zhang, sp. nov. ( Figs 1; 2)

Species nova habitu Phaii tankervilleae (Banks ex L’Hér.) Blume similis, sed floribus viridiflavis, labiis interne flavis, apicis 2-lobatis et columnis candidis differt.

TYPUS. — Vietnam. Lam Dong Prov., Bao Loc District, 3.I.2011, VTN 710 (holo-, VTN!; iso-, IBSC!, SZG!). DISTRIBUTION, HABITAT AND PHENOLOGY. — This endemic species is only known from the type locality Bao Loc District, Lam Dong Province, Vietnam. It grows on wet mossy ground above shale, sandstone and granite under closed evergreen broad-leaved primitive forest, in shaded and damp places in forests, at forest margins, along valleys, or by the stream with high humidity; 800-1200 m a.s.l. Flowers December to March (in cultivation).

ETYMOLOGY. — The specific epithet refers to the type locality, Bao Loc , Lam Dong Province, Vietnam .

DESCRIPTION

Herbs, terrestrial, erect, 60-80 cm tall. Pseudobulb conic, ovoid, or subglobose, 7-8 cm long, 3-4 cm in diameter. Leaves 2-5, in the upper part of the pseudobulb; blade green, elliptic-lanceolate, 45-70 × 5-8 cm, glabrous, apex acute, with veins 3(-5) prominent clearly; petiole 15-20 cm long. Inflorescences produced from base of pseudo-

B C

A

D

G

E F

G, H

H

I

bulb or axils of leaves, exceeding height of leaves, 60-100 cm tall, sparsely 10-15 flowered, glabrous; floral bracts usually caducous, lanceolate, 5-6.5 × 1.5-2.3 cm, glabrous. Flowers nutant, widely opening, large, 9-10 cm in diameter; pedicel and ovary 4-4.5 cm long, glabrous; sepals and petals white outside, yellowish green inside. Dorsal sepal, oblong-lanceolate, 5-5.5 × 1.8-1.9 cm, glabrous, apex acuminate; lateral sepals narrowly elliptic 5.5-6 × c. 1.7 cm, acute. Petals narrowly elliptic 4.5-5 × c. 1.5 cm; lip light yellow toward base with white stripes, white in middle and light yellow at margin toward entance inside, 4-4.5 × c. 2.5 cm, broadly obovate, shallowly 3-lobed; lateral lobes nearly semicircular, c. 1.8 × 0.8 cm, and convolute, margin undulate and whitish yellow; mid-lobe longitudinally oblong, puberulent in the middle inside, margin undulate and striate, apex bilobated; spur slightly curved, yellowish white, subcylindric, 0.5-0.8 × c. 0.2 cm, apex slightly unequally bilobed. Column spotlessly white, 2-2.4 × c. 0.4 cm, puberulent ventrally; rostellum membraniform, trianglar. Anther cap white, hemispheric, attenuate at the front, c. 4-5 mm wide; pollinia ovate, attenuate into the short stalk, slightly unequal in size, 1.2- 1.8 × 0.8-1.2 mm.

REMARKS

The new species Phaius baolocensis sp. nov. is very similar to Phaius tankervilleae (Banks ex L’Hér.) Blume and Phaius australis var. bernaysii (F. Muller ex Bernays) Nicholls in morphological characters of pseudobulb, leaves and flower. However, it differs by having rachis sparsely, lateral sepal narrow elliptic, petal narrow eliptic, lip apex bilobated, spur subcylindric and short ( Table 1).