ORCHIDACEAE - China

EPIDENDROIDEAE 349Plants 20–60 cm tall. Stems nearly clustered, erect, terete,slightly swollen at base, cylindric, 15–50 cm, 3–5(–8) mm indiam., many noded, with internodes enclosed in leaf sheaths.Leaves many, alternate along stem, sessile, linear or narrowlylanceolate, 10–20 × 0.3–0.6 cm, apex acuminate. Inflorescences1 or 2, subterminal, 10–15 cm, many flowered, with densegrayish white cottony hairs; floral bracts ovate-lanceolate orsubtriangular, 5–6 mm, abaxially (sometimes only at base) withgrayish white cottony hairs, acuminate. Flowers yellowishgreen; pedicel and ovary 2–3 mm, densely grayish white cottony.Sepals densely grayish white cottony abaxially; dorsalsepal ovate-elliptic, ca. 3 × 1 mm, obtuse; lateral sepals ±obliquely triangular, ca. 3 × 2.5 mm, obtuse; mentum ca. 2 mm.Petals oblong, ca. 3 × 1.5 mm, glabrous, broadly obtuse; lipsubflabellate in outline, base shortly clawed, distally 3-lobed;lateral lobes subovate-triangular; mid-lobe ± reniform, ca. 1.5 ×2.5 mm; disk with a white, somewhat dumbell-shaped projectionfrom base to near apex and 2 smaller projections on bothbasal sides; dumbell-shaped projections ca. 1 mm, globoseproximally and ellipsoid-cuneate distally. Column less than 1mm, foot ca. 2 mm. Capsule cylindric, ca. 1 cm × nearly 1.5mm, with grayish white cottony hairs. Fl. Apr–Jun. 2n = 38 +0–4B.Epiphytic on trees in forests; ca. 800 m. S Yunnan [Bhutan, Cambodia,NE India, Laos, Myanmar, Nepal, Thailand, Vietnam].123. CYLINDROLOBUS Blume, Fl. Javae Praef. vi. 1828.柱 兰 属 zhu lan shuChen Xinqi ( 陈 心 启 Chen Sing-chi), Luo Yibo ( 罗 毅 波 ); Jeffrey J. WoodCeratium Blume, Bijdr. 342. 1825, not Schrank (1793), nor Albertini & Schweinitz (1805).Herbs, epiphytic or rarely terrestrial. Stems elongate, slender, usually not pseudobulbous, but in some species a few terminalinternodes sometimes slightly swollen, with leaves along entire length, except for a few nodes at base where persistent leaf sheathsare found, or with only a few leaves toward apex. Leaves alternate, conduplicate, linear-oblanceolate, narrowly elliptic, or narrowlyovate, leathery, articulate to a sheathing leaf base tightly enveloping stem. Inflorescences lateral on many nodes or arising fromterminal node of stem, usually short and slender, only 1- or a few flowered; peduncle usually very much reduced; floral bracts few,spirally arranged, in some species conspicuous, brightly colored, fleshy. Flowers mostly white or cream-colored, sometimes ochreyellow,medium-sized, glabrous or sparsely stellate-hairy on abaxial surface of sepals; pedicel and ovary glabrous. Dorsal sepal free,often recurved; lateral sepals oblique at base, forming with column foot a blunt, oblique mentum. Petals free, smaller than sepals; lip3-lobed, hinged to column foot, curved, adorned with a papillose, subglobose callus and papillose keels, or only with laminate keels;lateral lobes erect, enclosing column; mid-lobe in most species smaller than lateral lobes. Column short, foot shorter than or ca. aslong as column proper; pollinia 8, rectangular, arranged in a series of pairs, 1 large and 1 small, posterior 4 much smaller.About 30 species: SW China, Indochina, Indonesia, Malaysia, Myanmar, Philippines, Thailand; three species (one endemic) in China.1a. Stems slender, terete, not fleshy, 1–2 mm in diam.; lip ca. 3.5 mm .......................................................................... 1. C. tenuicaulis1b. Stems stout, clavate, fleshy, 2–6 mm in diam.; lip nearly 1 cm.2a. Lip yellow ................................................................................................................................................................ 2. C. cristatus2b. Lip lateral lobes with purple edges, mid-lobe with lighter purple edges and patch .......................................... 3. C. marginatus1. Cylindrolobus tenuicaulis (S. C. Chen & Z. H. Tsi) S. C.Chen & J. J. Wood, comb. nov.细 茎 柱 兰 xi jing zhu lanBasionym: Eria tenuicaulis S. C. Chen & Z. H. Tsi,Guihaia 15: 109. 1995 [“tennicaulis”]; E. gracilicaulis S. C.Chen & Z. H. Tsi (1988), not Kraenzlin (1910).Rhizome often slightly flexuous. Stem ± flexuous, terete,1–2 mm in diam., noded, usually with 3 or 4 leaves at apex.Leaves oblong or lanceolate-oblong, 4–5 × 0.6–1 cm, apex acuminate;petiole 2–4 cm, articulate. Inflorescence arising fromaxil of apical leaf or a lower node, 5–6 mm, 2- or rarely 1-flowered; floral bracts broadly elliptic, cuspidate-acuminate.Flowers small, 4–5 mm in diam., glabrous; pedicel and ovaryca. 3 mm, glabrous. Dorsal sepal oblong-ovate or suboblong, 3–3.5 × ca. 1.2 mm, acute; lateral sepals broadly triangular-ovate,oblique, ca. 4 × 2 mm, subacute. Petals subovate, slightlyshorter than dorsal sepal, acute; lip subovate in outline, ca. 3.5mm, base subcuneate, 3-lobed; lateral lobes ca. 1.5 mm, ovate;mid-lobe subquadrate, ca. 1 × 1 mm, crisped and apiculate, witha central suborbicular lamella ca. 0.5 mm high; disk with 2suborbicular lamellae ca. 0.6 mm high. Column slightly arcuate,ca. 1.7 mm, apex slightly enlarged; foot ca. 1.5 mm. Fl.Apr.● Epiphytic on tree trunks in evergreen forests; 1500–2200 m. SEXizang.2. Cylindrolobus cristatus (Rolfe) S. C. Chen & J. J. Wood,comb. nov.鸡 冠 柱 兰 ji guan zhu lanBasionym: Eria cristata Rolfe, Bull. Misc. Inform. Kew1892: 139. 1892.Pseudobulbs terete, sometimes clavate at apex, 9–11 cm,3–6 mm in diam. Leaves 3 or 4, lanceolate, 6–8.5 × 1–1.4 cm,acute. Inflorescences subterminal, 2-flowered; rachis whitetomentose; floral bracts yellowish green, oblong-ovate, recurved,1.2–1.3 × 0.8–0.9 cm, obtuse. Flowers white; lip yellow,somewhat darker on disk and margins of lateral lobes;pedicel and ovary ca. 1.5 cm, white tomentose. Dorsal sepalovate-lanceolate, 13–14 × 6–7 mm, subacute; lateral sepalstriangular-ovate, carinate, ca. 15 × 7–8 mm, base oblique. Petals