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152 CXXXVI. ORCHIDElE. [Bromheadia.<br />
long, crowded in a terminal head with ovate bracts imbricate.<br />
Flowers I in. across; pedicels '25 in. long. Sepals lanceolate acute,<br />
yellowish. Petals broader pale yellow. Lip side-lobes ovate<br />
yellowish dotted purple, midlobe yellow, 2 pink spots. Column<br />
thin broad. Hab. Not common. Johor, Tebing Tinggi. Pahang,<br />
Tahan River. Negri Sembilan, Siliau (Williams). Perak, Ipoh.<br />
(Ridley). Distrib. Borneo.<br />
50. POLYSTACHYA, Lind!.<br />
Epiphytes with short pseudobulbs. Leaves lanceolate thinly<br />
coriaceous. Inflorescence terminal erect, stem covered with papery<br />
bracts in the axils of which are one or more racemes or panicles<br />
of small green (or purple or yellow) flowers sub-sessile. Upper<br />
sepals lanceolate, laterals triangular adnate to the column foot.<br />
Petals very narrow. Lip jointed on the column foot clawed<br />
lobes small. Column short broad, foot long. Anther 1- to 2-celled.<br />
Pollinia 4 ovoid with (usually) a broad disc. Capsule small ellipsoid.<br />
Species 100, all tropics. Chiefly African.<br />
All our species are very closely allied and show very little difference from<br />
the BrazllIan P. luteola Lindl.<br />
Llp narrow. side·lobes oblong; midlobe ovate ( I) P. singapnrensis<br />
Lip broad, slde·lobes short. midlobe oblong,<br />
much longer . . . . . . (2) P. penangensis<br />
Lip broad. slde·lobes short; mld-Iobe oblong.<br />
much longer (3) P. siamensis<br />
(I) P. singapurensis Ridl. Journ. Linn. Soc. xxxii. 343; Mat.<br />
i.I46.<br />
Pseudo bulbs globose, '25 in. long. Leaves oblong-Iorate, 2 to<br />
4 in. long, I in. wide. Inflorescence 2 to 6 in. long; rachis of<br />
racemes pubescent. Flowers yellowish green. Bracts ovate acumi·<br />
nate. Sepals bullate. Petals linear-spathulate. Lip narrow thin,<br />
side-lobes falcate linear acute, midlobe longer ovate pulverulent,<br />
spotted pink inside. No rostellum. Hab. Rare. On trees near<br />
the sea. Singapore, Sungei Morai (Ridley).<br />
(2) P. penangensis R1dl.l.c. 344; Mat. i. 146.<br />
Pseudo bulbs conic, I in. long. Inflorescence 5 to 10 in. long.<br />
Racemes branched, I in. long. Flowers greenish yellow. Sepals<br />
and petals acute. Petals spathulate. Lip broad, side-lobes short<br />
ovate, midlobe ovate blunt hardly longer, pubescent yellow with a<br />
brown median line. Capsule'5 in. long, reticulate between tbe<br />
ribs. Hab. Local. Penang Hill at 1800 ft. altitude (Curtis).<br />
(3) P. siamensis Ridl. l.c. 343; Mat. i. 146.<br />
Pseudobulbs '5 to I in. long. Leaves 5 in. long, '5 to I in. wide.<br />
Inflorescence 4 to 12 in. long; rachis pubescent. Flowers larger<br />
and more fleshy than preceding. Bracts ovate subulate. Sepal<br />
upper ovate-Ianceolate, laterals triangular green. Petals narrower,<br />
falcate acute white. Lip obovate broad, mealy, side-lobes small
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