戟形虾脊兰 ji xing xia ji lan

Calanthe trulliformis King & Pantling var. hastata Finet.

Plants 25-38 cm tall. Rhizome inconspicuous. Pseudobulbs very small, with 3 or 4 sheaths. Leaves 4, well developed and spreading at anthesis, not deciduous, subsessile; blade narrowly lanceolate or narrowly elliptic, 12-16 × 1.5-2 cm, apex acuminate. Scape arising from leaf axil, erect, 24-34 cm, puberulent; rachis 6-12 cm, laxly 3-7-flowered; floral bracts persistent, ovate-lanceolate, 13-15 mm, abaxially slightly puberulent. Flowers nodding, pale yellow and green; pedicel and ovary 15-20 mm, densely puberulent. Dorsal sepal elliptic-lanceolate, ca. 14 × 5 mm, abaxially puberulent, 5-veined, apex acuminate; lateral sepals ovate-lanceolate, oblique, ca. 14 × 4.5 mm, abaxially puberulent, 5-veined, apex acuminate. Petals linear, ca. 12 × 2 mm, glabrous, 3-veined, apex acuminate; lip adnate to entire length of column wings, yellow, orange-brown at base, subovate-triangular, 3-lobed; lateral lobes ovate, ca. 5.5 × 4 mm, ca. 8 mm across their apices, apex obtuse; mid-lobe suboblong, ca. 6 × 4.5 mm, apex acute; disk with 3 lamellae, central one extending almost to apex of mid-lobe; spur cylindric, 4-5 mm, outside puberulent, apex obtuse. Column ca. 5 mm, thick, dilated toward apex; rostellum 2-lobed; lobes ca. 1.2 mm; pollinia narrowly obovoid, ca. 14 mm; viscidium suborbicular. Fl. Jun. 2n = 38, 40.

Forests; ca. 2600 m. SE Xizang [Japan].