CRUCiFER.E lo'J 



Plate 57. 



LEAVENWORTHIA, Torr. 



Siliqua oblonga, comprasso-plana, valvis, enerviis. Semi- 

 na uniseriata, plana, alata. Embryo recta! — Herba? pusillas, 

 foliis omnibus radicalibus lyratis, scapis nudis 1 - 8-floris. 



Leavenworthia, Torr. in Ann. Lye. Nnt. Hist. New York, 3. p. . s ? i !j 

 Torr. & Gray, Fl. N. Am. 1. p. 89. Endl. Gen. 4862. 



Calyx equal at the base ; the sepals nearly erect. Petals 

 spatulate-cuneiform, emarginate or truncate, spreading, much 

 longer than the calyx, tapering gradually into a short claw. 

 Stamens strongly tetradynamous : filaments filiform, tooth- 

 less : anthers linear-oblong. Ovary linear, tipped with a 

 short style, and a capitate stigma. Ovules several in each 

 cell, alternately inserted on each placenta, pendulous on free 

 funiculi. 



Silio^ue oblong-linear or oblong, compressed, often some- 

 what torulose, two-valved ; the valves nearly flat, minutely 

 veiny, destitute of a midnerve : partition thin, marked with 

 a midnerve, the areola? oblong-linear, straight and transverse. 

 Seeds 4 or 5 in each cell, forming a single series, pendulous 

 on slender free funiculi, orbicular, flat, with a broad winged 

 margin, often overlapping each other. Embryo small in pro- 

 portion to the size of the seed, straight ! or with the orbicu- 

 lar flat cotyledons slightly inclined accumbently ; the radi- 

 cle short and thick, straight, obliquely ascending 011 the 

 side remote from the placenta. 



Herbs of small size, chiefly acaulescent ; with biennial 

 or annual roots, lyrate-pinnatifid radical leaves and one- 

 flowered radical peduncles, or 3 - 8-flowered scapes which 

 often bear a single leaf below. Pedicels elongated. Petals 

 yellow. 



10* 



