ORCHIDACEAE 165 
both locally known as “dapo tigre,” that is, tiger orchid: with green leaves 
and medium, straw-colored or yellowish flowers with purplish markings, 
P. luddemanniana Reichb. f., and with green leaves and small pink 
flowers, P. equestris (Schauer) Reichb. f. Vanda, with elongated 2-ranked 
_ leaves and recemose flowers, V. sanderiana Reichb. f., from Mindanao with 
very large purplish flowers about 8 cm in diameter, and V. lamellata Lindl. 
(Fl. Filip. pl. 465), with white and purple flowers about 4.5 cm in diameter. 
Aerides, represented by A. quinquevulnerum Lindl. (FI. Filip. pl. 409), 
with showy racemes of very fragrant flowers, each perianth-segment and 
the lip with a large purple spot. Rhynchostylis, with R. retusa (L.) 
Blume, simulating the preceding in habit and appearance, but with odorless 
flowers, and occasional species of Paphiopedium (Cypridiwm), as well as 
less desirable species of such genera as Pholidota, Eria, Grammatophyllum 
(Fl. Filip. pl. 276), Cymbidium, Renanthera, pepe Trichoglottis (FI. 
Filip. pl. 848.), etc. 
1. Terrestrial, saprophytic, white and colorless or brownish plants. 
1. Didymoplexis 
1. Terrestial herbs with green leaves. 
2. Leaves plicate; flowers few, in nodding racemes, the scapes from 
(EES E Cl Salat se oa, Id Ses SO Oe a 2. Geodorum 
2. Leaves not plicate; flowers numerous in erect spikes or racemes ter- 
PS RNRES RTECS MEAS" COIN pe nS rt Nn cnach ccnsawinn eer conse 3. Habenaria 
1. Elongated epiphytic plants with distichous leaves. 
2. Leaves not equitant. 
SEEMS Obs MALCKENeG Ab, DNC, BSC: ccs ones censaeceed--= 4. Cleisostoma 
8: Stems much thickened at the base......... cae el rt eee 5. Dendrobium 
aE AINA cee tan) ccs: ory Ake chee an pte ~~ =< Teeentiar cer 6. Oberonia 
1. DIDYMOPLEXIS Griffith 
A slender, leafless, white or brown saprophyte from thickened tuberous 
roots, the scape slender, erect, with few racemosely arranged flowers, the 
pedicels much elongated in fruit. Flowérs small, the dorsal sepal connate 
with the petals forming a 38-fid upper lip, the lateral ones connate into an 
entire or 2-fid lower lip forming a small projection at the foot of the col- 
umn, Lip inserted on the short column-foot, short, broad, included. Col- 
umn elongated, narrow, narrowly 2-winged above, 2-toothed; stigma broad; 
anther broadly ovate. (Greek “twin” and “a knitting,” in allusion to the 
connate sepals and petals.) 
A monotypic genus, by some anthers reduced to Gastrodia R. Br. 
1. D. pailens Griff. 
A slender, white or brown, leafless saprophyte growing about clumps 
of bamboo, 6 to 20 cm high, the tuberous roots 1 to 3 cm long, up to 1 cm 
in diameter. Flowers white or flesh-colored, few, in lax racemes, the 
bracts much shorter than the pedicels. Ovary about as long as the ped- 
icel which becomes greatly elongated in fruit. Lip fan-shaped, cuneate 
at the base. Sepals and petals adherent, forming a tubular perianth, 6 to 
pot long. Column about 4 mm long, half-rounded below, narrowly winged 
above. 
About clumps of bamboo, occasional, fl. June-July; of local occurrence 
in the Philippines. India to Formosa, southward to Malaya. 
