Leavenworthia. CRUCIFERiE. 89 



10. PHCENICAULIS. mat. mss. 



" Calyx colored, nearly equal at the base, much shorter than the entire un- 

 guioulate petals. Silique ensiform, acuminate, flat, not opening elastically ; the 

 cells about 3-seeded ; valves with a prominent central nerve. Seeds large, 

 in a single series, not margined; funiculi flat, short, dilated and slightly 

 adnate towards the base. [Cotyledons flat; the radicle not apphed to their 

 edge, but lying a little to one side.]— A low perennial herbaceous plant, with 

 a thick ascending caudex. Scapes slender. Leaves entire, densely and 

 stellately toracntose. Flowers in simple corymbose racemes, j)urple. Si- 

 liqucs diverging horizontally." 



P. cheiranthoides (Nutt. ! mss.) 



" High hills to the east of Wallawallah River, and on rocks on the upper 

 part of the Oregon. — Stem partly subterranean and descendinjr to a con- 

 siderable depth. Leaves oblong-lanceolate, entire ; the base attenuated into a 

 long petiole which is dilated and sheathing at its insertion. Scapes 4-6 

 inches long, with a few small sessile and partly clasping leaves. Sepals ob- 

 long, obtuse, bright purple on the margin. Petals purple, oblong-oval, the 

 claws as long as the calyx. Stamens about as long as the calyx. Stigrna 

 nearly sessile, somewhat capitate. Pedicels of the flowers erect, of the fruit 

 divaricate. Siliques straight 1-li inch long, obtuse at the base, tapering to a 

 long point: valves obscurely reticulated : [septum opaque, with a distinct sin- 

 gle or double longitudinal nerve : areolae very tortuous, reticulated.] Seeds 

 oval, smooth, distant, nearly as broad as the septum. — Allied to Parrya ma- 

 crocarpa ; but differing in the cuspidate siliques, the few seeds in a single 

 series, without the loose epidermis." Nutt. — The cotyledons are not truly 

 accumbent ; but the radicle is applied to the back of one of them, not far 

 from the edge. 



11. LEAVENWORTHIA. Torr. in aim. lye. New- York, 3. />. 87. t. 5. 



Calyx somewhat erect, equal at the base. Petals equal, cuneiform, trun- 

 cate or emarginate. Filaments distinct, toothless. Silique sessile, oblong- 

 linear, compressed, somewhat inflated and contracted between the seeds; 

 valves indistinctly nerved. Style distinct, or ahnost none. Stigma minutely 

 bidentate. Seeds in a single series, flattened, with a broad winged margin : 

 funicuU free. Embryo nearly straight! or with the radicle slightly be^t 

 towards the edge of the cotyledons : radicle very s'ho'rt,' conical, poinding 

 obliquely upward : cotyledons orbicular. Septum l-nerycd, minutely reticu- 

 lated ; the areolae transversely linear-oblong. — Annual herbaceous plants. 

 Leaves lyrately pinnatifid. Flowers in loose scapoid racemes, or solitary on 

 long subradical peduncles, yellow. 



1. L. aurea (Torr.) : style distinct ; embryo nearly straight. Toi-r. I. c. 

 Cardamine uniflora, Leavenworth, in Sill. jour. 7. p. 63, (not of Michx.) 



Wet places, near Fort Tdwson, Arkansas; also in Texas, and in Jef- 

 ferson County, Alabairia, Dr:. Leavenworth! — Root straight, descending. 

 Plant 2-6 inches high. Stem at first short and simple, but at leiigth branch- 

 ing from the base ; the branches ascending. Leaves mostly radical ; pinna- 

 tifid, somewhat fleshy ; segments 2-4 pairs, roundish-oblong, obtusely tooth- 



12 



