extreme is exemplified in B. oiantham, with its ovoid- 

 campanulate or subglobose corolla. Between the two 

 limits an almost unbroken series of intermediate con- 

 ditions may be met with. In the species figured the 

 structure of the corona is peculiar : the lobes are in two 

 series, but unite to form a cupule apparently composed 

 of five broad 3-lobed - segments. What appear to be the 

 lateral lobes of each segment really represent the con- 

 stituents of a 10-lobed outer corona, while the five 

 intermediate lobes represent the inner corona, the 

 members of which are opposite to and closely applied to 

 the back of the corresponding anthers. The ten lateral 

 lobes are contiguous in pairs which alternate with the 

 intermediate lobes, and may thus owe their origin to 

 fission of five outer corona-lobes alternate with the five 

 inner ones. 



Description.—//^ ; tuber flat, about 2 in. across ; 

 stem erect, simple or sparingly branched, pubescent. 

 Leaves lanceolate, elliptic-lanceolate or elliptic-oblanceo- 

 late, acute, |-2 in. long, nearly § in. wide, short-petioled, 

 minutely ciliate, more or less pubescent. Flowers soli- 

 tary, nodding or horizontal. Calyx 5-lobed ; segments 

 lanceolate or ovate-lanceolate, acute, I in. long, sparingly 

 pubescent. Corolla ovoid-campanula'te, shortly 5-lobed, 

 glabrous outside, greenish-yellow with dark purple spots ; 

 tube sometimes nearly 1 in. long, usually shorter, 1 in. 

 wide, beset inside with long white or dark purple hairs ; 

 lobes 5, deltoid, acute, about J, in. long and wide, long- 

 cihate. Corona of 5 segments united in a cupule, each 

 segment 3-lobed, the 10 lateral lobes representing an 

 outer series deltoid obtuse, the 5 intermediate lobes 

 representing an inner series adpressed to the backs of, 

 and not longer than, the anthers. . 



Fig. 1, bud ; 2, corolla in longitudinal section ; 3, a single corolla-lobe J 

 4 , corona and gynostegium ; 5, pollen-masses :~all enlarged except 2, which is 

 oj natural size. * * 



