5. Calanthe clavata Lindley, Gen. Sp. Orchid. Pl. 251. 1833.
棒距虾脊兰 bang ju xia ji lan
Alismorkis clavata (Lindley) Kuntze; Calanthe clavata var. malipoensis Z. H. Tsi.
Plants ca. 40 cm tall. Rhizome stout, ca. 1 cm in diam., with scalelike sheaths and thick roots on nodes. Pseudobulbs very small, completely enclosed in sheaths. Leaves 2 or 3, basal, well developed at anthesis, not deciduous; blade narrowly elliptic, 50-65 × 4-10 cm, apex acute; petiole-like base 8-12 cm, articulate, conduplicate, enclosed by tubular sheaths and forming a pseudostem ca. 13 cm. Scapes 1 or 2, arising from base of pseudobulb, erect, to 40 cm, 7-13 mm in diam., with several scattered tubular sheaths; rachis 6-8 cm, densely many flowered; floral bracts caducous, lanceolate, 1-3.5 cm, membranous, glabrous. Flowers yellow; pedicel and ovary ca. 15 mm, glabrous. Dorsal sepal elliptic, ca. 12 × 5-6 mm, 5-veined, apex acute; lateral sepals suboblong, ca. 12 × 4-5 mm, 5-veined, apex aristate. Petals obovate-elliptic to elliptic, ca. 10 × 5 mm, 5-veined, apex acute; lip adnate to entire length of column wings, 6-8 × 4-5 mm, 3-lobed; lateral lobes erect, auriculate or subovate-triangular, 2-3 mm, ca. 7 mm across their apices; mid-lobe orbicular, ca. 4 × 5-5.5 mm, apex truncate and emarginate; disk with 2 triangular lamellae at base; spur straight, clavate, ca. 9 × 3.5 mm. Column ca. 7 mm, thick, dilated at apex; rostellum triangular, ca. 0.8 mm, unlobed; pollinia subclavate or narrowly obovoid, subequal in size, ca. 1.2 mm, with short caudicles; viscidium subcordate, thick. Fl. Nov-Dec. 2n = 40.
Dense forests, rocky places along valleys; 800-1300 m. Fujian, S Guangdong, S Guangxi, Hainan, Taiwan, SE Xizang, S and SE Yunnan [NE India, Myanmar, N Thailand, N Vietnam].