OBCHIDACEAE 165 



both locally known as "dapo tigre," that ii, tiger orchid: with green leaves 

 and medium, straw-colored or yellowish flowers with purplish markings, 

 P. luddemannima Reichb. f., and with green leaves and small pink 

 flowers, P. equestris (Schauer) Eei,chb. f. Vanda, with elongated 2-rank6d 

 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.-Fllip, pi. i65), with white and purple flowers about 4.5 cm in diameter. 

 Aerides, represented by A. quiriquevulnerum Lindl. (Fl. Filip. pi. i09), 

 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 {Cypridium) , as well as 

 less desirable species of such genera as Pholidota, Eria, Grammatophyllum 

 (Fl. Filip. pi. 276), Cymbidium, Renanthera, Stauropsis, Trichoglottis (Fl. 

 Filip. pi. Si8.), etc. 



1. Terrestrial, saprophytic, white and colorle.ss or brownish plants. 



1. Didymoplexia 

 1. Terrestial herbs with, green leaves. 

 2. Leaves plicate; flowers few, in nodding racemes, the scapes trdia 



the rootstock...^ 2. Geodorum 



2. Leaves not plicate; flowers numerous -in erect spikes or racemes ter- 

 minating the leafy stem 3. Eabenaria 



1. Elongated epiphytic plants with distichous leaves. 



2. Leaves not equitant. 



3. Stems not thickened at the base ' 4. Cleisostoma 



3. Stems much thickened at the base .^... 5. Dendrobium 



2. Leaves equitant ...., ^ '-— 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. Flowers small, the dorsal sepal connate 

 with the petals forming a 3-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 br6ad; 

 anther broadly ovate. (Greek "twin" and "a knitting," in. allusion to the 

 connate sepals and petals.) 



A monotypic genus, by some anthers reduced to Gastrodig, R. Br. 



1. D. pallens Griff. 



A slender, white or brown, leafless saprophyl^e growing about clumps 

 of bamboo, 6 to 20 cm high, the tuberous roots 1 to 3 cm long, up to 1cm 

 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 f^an-shaped, cuneate 

 at the base. Sepals and petals adherent, forming ^ tubular perianth, 6 to 

 7 mm 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. 



