TEUEBINTHAGE^. 261 



five stamens, those wliicli correspond to the intervals of the petals 

 being slightly longer. All have a free filament inserted below an 

 hypogynous annular disk, dilated at the base and tapering at the 

 top, supporting a bilocular, iutrorse anther, dehiscing by two longi- 

 tudinal clefts. The gyuscceum, rudimentary in the male flowers, is 



Bursera (Eiiburscra) gmnmifcra. 



Fig. 260. Male flower (a). 



Fig. 270. Longitudinal 

 section of male flower. 



Fig. 271. Hermaphro- 

 dite flower (s). 



Fig. 273. Longitudinal section 

 of hermaphrodite flower. 



Fig. 272. Diagram of 

 hermaphrodite flower. 



Fig. 274. Hermaphrodite 

 flower without the perianth. 



composed of a fi'ee ovary tapering upwards in a style whose stigma- 

 tiferous apex is dilated and divided into five lobes, superposed 

 like the cells (fig. 266), to the petals. In the internal angle of 

 each cell, the placenta supports two collateral, descendent, anatropous 

 ovules, with micropyle dh-ected upAvards and outwards (fig. 208). The 

 fruit, accompanied at its base by a more or less persistent calyx, is a 

 drupe whose stones, one to six in number, each enclose a descendent 

 seed. The ex-albuminous embryo has thick fleshy cotyledons, 

 several times folded together, and a short superior radicle. B. 

 ohtusifoUa, chosen as the type of the genus Marignia^ is a handsome 

 tree with alternate leaves, stipulate compound imparipianate, with 

 opposite folioles. Its axillary or super-axillary inflorescence is in 

 ramified clusters of biparous cymes in which each flower occupies the 

 axil of a small bract. 



' CoMMEHS. ex. K. in ^««. &. iVn^. sér. 1, ii. Dmnmara G^rtn. Frmt. ii. 100, t. 10.3 (not 

 350.— DC. Frndr. ii. 79.— Endl. ffiw. .5935.— RuMi-ii.). 



