TO TETRADTNAMIA. SILTQUOSA. 



natifid; slliques pedunculate, slender and spreading, most*- 

 ly scabrous. Hab. Not unconamon on 'he banks of the 

 Ohio, from Le Tari's rapids doM'nwards. Obs. Hool pe- 

 rennial. Stem 2 or 3 feel high, simple or branched, smooth, 

 angular and grooved. Leaves ovate-lanceola'.e, sessile, re- 

 mote, sharply and unequally toothed, tliin and membra- 

 naceous, the under side minutely scabrous, lower stem 

 leaves amplexicaule and pinnatifid only towards Uie at- 

 tenuated base; (aDout 3 inches lorag, and 1 wide.) Ra- 

 ceiiie mostly terminal and simple, occasionally axillary. 

 Peduncle very distinct, m the fruit half an inch long. Ra- 

 chis, peduncle and silique usually scabrous. Calix ovate, 

 a litt.e purpiisli, leavt s membranaceous on the margin, 

 sr.orter than the claws ot t!ie petals, 2 of them distinctly 

 gibbous at the base. Petals obiusely obovate, entire, pale 

 purple, small. Anthers revoluie. btigma a little dilated 

 at the base, lobes connivent. Silique rather compressed, 

 torulose, near 2 inches long, and about the thickness of an 

 ordinary sowing thread, shortl) rostrate, eui'ved upwards 

 in a line with the peduncle. 



A genus of about 20 species, with the above exception, 

 exclusively indigenous to tiie south of Eui-ope, and Nor- 

 thern Africa. 



464. ARAJBIS. i. (Wall- Cress.) 



« Silique linear (mostly compressed) crowned 

 with tliC subsessile stigma; valves venose or 

 nerved. Seeds disposed in a single series. 

 Cotyledones acciimbent. Calix QvecV 11. Brown. 

 Hort. Kew. 4. p. t04. 



Species. 1. A. ulpina. 2. tJiallana. 3. reptans. 4. 

 lyiata. Perennial. Stem and upper entire linear leaves 

 smooth and glaucous; radical leaves lyrate, often pilose; 

 peduncle spreading, silique erect and compressed. 5. stria- 

 ta. Q.^canadcnsis. A.fukata. M^ch. 7. pendidu? Leaves sa- 

 gittate oblong, ampiexicaule, entire and smooth; silique 

 a icipltal, linear, pendulous. Was. Near Fort Mandan on 

 the banks of the Missouri. Stem nearly simple, spike 

 very long. Calix and corolla erect. 8. rhonboidea, A. 

 bullosa, Muhlenberg. Cardaniine votu7idifolia? Mich. Obs. 

 Radical leaves roundish, upon long petioles, proceeding 

 irom the bulb or tuber, cauline subsessile, rhomboid-ovate, 

 sparingly and incisely toothed; flowers very much like 

 those of Curdamine pratensis, but white; siliques divaricate. 

 Upon very long peduncles, linear, very smooth, flat, and 



