13. Thrixspermum amplexicaule (Blume) H. G. Reichenbach, Xenia Orchid. 2: 121. 1868.
抱茎白点兰 bao jing bai dian lan
Dendrocolla amplexicaulis Blume, Bijdr. 288. 1825.
Stems slightly compressed trigonous, ca. 35 cm, ca. 2 mm in diam., slender, with many nodes, internodes ca. 2 cm, each node bearing an aerial root. Leaves well spaced, ovate-lanceolate, 2-2.5 × ca. 0.7 cm, thinly textured, base cordate and amplexicaul, apex acute and minutely bilobed. Inflorescence 30-35 cm, more than 10 × as long as leaves, slender, many flowered; floral bracts persistent, distichous, 2-3 mm apart from each other, 3-4 mm. Flowers opening 1 or 2 at a time and lasting a day only, white or lilac-pink, to 3.5 cm in diam., column white; pedicel and ovary 7-8 mm. Sepals ovate, ca. 17 × 11 mm, rather concave, obtuse. Petals slightly shorter and narrower; lip saccate, shorter than petals; lateral lobes erect, small, acute; mid-lobe fleshy, obtuse; sac ca. 6 mm deep, with a small yellow callus inside and a band of orange hairs below it. Column very much flattened, ca. 2.7 mm. Capsule cylindric, 7-8 cm × ca. 5 mm, slender.
Lithophytic on rocks near the sea; sea level to 100 m. E Hainan [India (Andaman Islands), Indonesia, Malaysia, New Guinea, Philippines, Thailand, Vietnam; Pacific islands (Solomon Islands)].