ORCHIDACEAE - China

EPIDENDROIDEAE 3712a. Inflorescences subumbellate, almost sessile, 2–6-flowered; lip disk with 2 purplish red spots ...................... 14. D. chrysanthum2b. Inflorescences racemose or 1-flowered.3a. Stems often with thickened middle and distal internodes, sometimes fusiform or slightly clavate; liprounded.4a. Lip with 1 transversely lunate deep purple spot, margin compoundly fimbriate ......................................... 47. D. fimbriatum4b. Lip with 2 chestnut spots, margin slightly erose ................................................................................................ 48. D. gibsonii3b. Stems cylindric, of even width, never swollen.5a. Inflorescences on leafy stems; lip golden yellow; peduncle perpendicular to stem; petals goldenyellow, entire.6a. Inflorescence 2–7-flowered; lip ± reniform-rounded, with 2 purple spots ............................................ 37. D. hookerianum6b. Inflorescence 1- or 2-flowered; lip rounded, without purple spots.7a. Flowers solitary in leaf axil, waxy when dry; lip ovate-rhombic, without any stripes ........................... 41. D. lohohense7b. Inflorescences 1- or 2-flowered, very rarely solitary, racemose or subumbellate; flowers notwaxy when dry ................................................................................................................................................ 51. D. henryi5b. Inflorescences on leafless stems.8a. Floral bracts cymbiform, 15–30 mm; peduncle sheaths 5–20 mm.9a. Stem clavate; inflorescences stiffly arching, to 7-flowered; lip with a central maroon spot ................. 45. D. denneanum9b. Stem linear; inflorescences erect, 1 or 2(or 3)-flowered; lip uniformly yellow with purplish linestoward base.10a. Inflorescence ca. 1 cm; floral bracts membranous, white, 12–13 mm ............................................... 44. D. chryseum10b. Inflorescence ca. 6 cm; floral bracts thickly papery, pale purplish, 15–20 mm ............................. 46. D. jiajiangense8b. Floral bracts ovate, 2–5 mm; peduncle 3–10 mm.11a. Flowers creamy yellow or pale yellow; lip ovate-lanceolate, margin entire .................................. 13. D. heterocarpum11b. Flowers golden yellow; lip relatively wider, margin erose, undulate, or long fimbriate.12a. Lip subreniform, with purplish red stripes near base, margin erose or undulate.13a. Stem ± compressed fusiform, 8–15 × ca. 1.5 cm; lip margin undulate; inflorescencesalways 1 per node ............................................................................................................................. 49. D. capillipes13b. Stem cylindric, 50–100 × 0.3–0.6 cm; lip margin erose; inflorescences often 2 per node ........... 50. D. dixanthum12b. Lip suborbicular or ovate-triangular, uniformly golden yellow, margin with branched fimbriae.14a. Petal margin densely long ciliate; lip suborbicular, margin with short branched fimbriae .......... 6. D. harveyanum14b. Petal margin entire; lip ovate-triangular, strongly plumose with long branched fimbriaeespecially along apical margin .................................................................................................... 5. D. brymerianumKey 31a. Stem nodes and internodes swollen, at least on branches, sometimes moniliform.2a. Stems slender, multi-branched, nodes and internodes swollen and moniliform; leaves less than 5 mm wide,distal on branches ..................................................................................................................................................... 15. D. falconeri2b. Stems often stout, unbranched; leaves more than 5 mm wide.3a. Peduncle with sheaths 2–3 cm; flowers white, stained purplish red at apex; lip retuse, disk yellow with2 dark purple spots ............................................................................................................................................ 16. D. wardianum3b. Peduncle at base with sheaths 3–6 cm; flowers not as above.4a. Floral bracts ovate, 5–6 mm; inflorescences subterminal from a leafy stem; flowers white with roseatetips; lip disk golden yellow below middle, with several purplish red stripes at base on either side;individual internodes swollen and obconic ................................................................................................. 19. D. findlayanum4b. Floral bracts broadly ovate, 7–10 mm; inflorescences on leafless stems; flowers white with palepurple or purplish red tips.5a. Stem nodes ± swollen, but not moniliform; lip disk at center with a pale yellow lunate spot, bothsides of base with several purplish red stripes ..................................................................................... 17. D. gratiosissimum5b. Nodes and internodes swollen, moniliform; lip disk below middle with golden yellow spot, basewithout purplish red stripes .......................................................................................................................... 18. D. pendulum1b. Stem nodes and internodes not swollen.6a. Stem often narrow in lower part, wider distally; leaf apex unequally bilobed.7a. Lip broadly ovate, much larger than petals .............................................................................................................. 28. D. nobile7b. Lip broadly oblong, ca. as large as petals or smaller ...................................................................................... 29. D. linawianum6b. Stem usually evenly cylindric, becoming narrower distally.8a. Sheaths on internodes with green and white stripes; flowers pale purplish red; lip suborbicular, palepurplish red above middle, golden yellow below middle ................................................................................ 26. D. crepidatum8b. Sheaths on internodes without green and white stripes.9a. Sepals and petals uniformly purple or purplish red.