注：名称已修订，正名是：牛角兰 Ceratostylis caespitosa

 Ceratostylis hainanensis Z. H. Tsi, Acta Phytotax. Sin. 33: 582. 1995.牛角兰 niu jiao lan

Ceratostylis caespitosa (Rolfe) Tang & F. T. Wang, Acta Phytotax. Sin. 1: 87. 1951, not L. O. Williams (1938); Eria caespitosa Rolfe; Trichotosia caespitosa (Rolfe) Kraenzlin.

Plants epiphytic or lithophytic. Rhizome short. Stems clustered, ca. 1 cm, unbranched; basal sheaths reddish brown, ovate-lanceolate or ovate, 5-10 mm. Leaf blade shortly petiolate, linear-oblanceolate, 30-60 × 2.5-4(-5) mm, articulate, unequally bilobed or sometimes ± unlobed. Inflorescence terminal, usually 1-flowered; floral bracts persistent, ca. 1 mm, scarious, amplexicaul at base. Flowers fragrant, white, with purplish stripes near base; peduncle and pedicel 4-5 mm. Dorsal sepal elliptic-oblong, 4-5 × ca. 2 mm, subacute; lateral sepals ± broadly oblong, 6-7 × ca. 3 mm; mentum ca. 2 mm. Petals lanceolate-oblong, 3.5-4 × ca. 1.5 mm, obtuse; lip ± broadly elliptic-rhombic, 5-6 × 3.5-4 mm, inconspicuously 3-lobed; lateral lobes subelliptic; mid-lobe broadly cordate-ovate, fleshy; disk with 2 longitudinal lamellae; lamellae fleshy, villous at base. Column very short, foot distinct. Capsule subellipsoid, 5-6 × 2.5-3.5 mm. Fl. and fr. May-Jun.

● Epiphytic on trees in forests, lithophytic on rocks along streams; 700-1000 m. Hainan.