I. OBERONIA, Lindl. 



Tufted epiphytes, never pseudobulbous; stem compressed; 



1. distichous, equitant, ensiform oblong or linear, fleshy, veins 



obscure, bases often confluent with the stem or ped. ; fl. very 



minute, densely crowded in elongate cylindric myuriform 



spikes, or spiciform racemes, which are usually curved or 



decurved in fl., more erect afterwards, sometimes in whorled 



fascicles, resupinate ; ov. short, not twisted ; perianth widely 



spreading, sep. subequal, broadly ovate (except O, Scyllcs) ; 



pet. narrower; lip superior, sessile on the base of the very 



short column, often shorter than the sep. ; anther terminal, 



incumbent; pollinia 4, waxy, cohering in pairs. — Sp. 50 or 60 ; 



45 in Fl. B. Ind. 



The most minute flowered of Asiatic genera of Orchids, requiring a 

 rather high magnifying power to determine the characters of the flowers. 



Sep. subequal. 



Pet. oblong or linear-oblong. 

 Bracts not longer than the fl, 

 Fl. not conspicuously whorled. 



Lip subreniform, shorter than the sep 

 Lip 3-lobed, longer than the sep. 

 Fl. conspicuously whorled 

 Bracts longer than the fl. . 

 Pet. linear. 



Lip quadrate, entire, or obscurely lobed 

 Lip 3-lobed. 

 Side lobes of lip linear, recurved . 

 Side lobes of lip broad, spreading. 



Lip hardly longer than the sep. . . 7. 



Lip longer than the sep. . , .8. 



Lateral seji. large, orbicular, dorsal lanceolate . 9. 



I. O. truncata, Lindl. Fol. Orchid.., Ober. 3 (1859). 

 Trim. Syst. Cat. 87. Thw. Enum. 296. C. P. 3913. 

 Fl. B. Ind. V. 677. 



Stem very short; 1. 3-4 by \-\ in., narrowly ensiform, sub- 

 acute, straight or subfalcate; ped. adnatc to the upper leaf, 



O. TRUNCATA. 

 O. RECURVA. 



O. Thwaitesii. 



O. longibracteata. 



O. zeylanica. 



5- 



6. O. tenuis. 



forcipata. 

 Wightiana. 



SCYLLjB. 



