78 TETRADYNAMIA, SIBIQUOSA. 
natifid; siliques pedunculate, slender and spreading, most- 
ly scabrous. Has. Not uncommon on the benks of the 
Ohio, from Le Yari’s rapids downwards. Oss. Koot pe- 
rennial. Stem 2 or 3 feet high, simple or branched, smovths 
“angular and grooved. Leaves ovate-lanceolate, sessile, re« 
mote, sharply and unequally toothed, thin and membra- 
naceous, the under side minutely scabraus, lower stem 
leaves amplexicaule and pinnatitid only towards the at- 
tenuated base; (about 3 inches loag, and 1 wide.) Ra- 
ceme mosily terminal and simple, occasionally axillary. 
Peduncle very distinct, in the fruit halfan inch long. Ra- 
chis, peduncle and silique usually scabrous. Calix ovate, 
a little purplish, leaves membranaceous on the margin, 
shorter than the claws of the petals, 2 of them distinct'y 
gibbous at the base. Petals obiusely obovate, entire, pale 
purple, small. Anthers revolute. Stigma a little dilated 
at the base, lobes conniyent. Silique rather compressed, 
torulose, near 2 inches long, and about the thickness of an 
erdinary sowing thread, shortly rostrate, curved upwards 
in a line with the peduncle. ; 
A genus of about 20 pariney with pnd above ag 
exclusively indigenous to the south of Europe, or- 
464. ARABIS. ZL. (Wall-Cress.) 
___ Silique linear (mostly compressed) crowned 
. with the subsessile stigma; valves venose or 
nerved, Seeds disposed in a single series. 
~ Cotyledones accumbent. Calix erect.” R. Brown. 
Hort.. Kew. 4, Pp. 104. 
Srecies. 1. A. alpina. 2. thaliana. 3. reptans. 4. 
iyrata. Perennial. Stem and upper entire linear leaves 
smooth and glaucous; radical leaves lyrate, often pilose; 
peduncle spreading, silique erect and compressed. 5. stric~ 
ta. Gjconad nsis. A. falcata. Mich. 7. pendula? Leaves sa- 
§ittate oblong, amplexicaule, entire and smooth; silique 
_ > @cipital, linear, pendulous. Has. Near Fort Mandan on: 
» oie bunks, of the Missouri. Stem nearly simple, spike _ 
a =e. Calix and corolla erect. 8.. Sains, A 
Radical leaves iendioh, upon long petioles, proceeding 
from the buth or tuber, cauline subsessile, rhomboid-ovate, 
and incisely toothed; flowers very much like 
Cardamine pratensis, but white; siliques divaricate, 
upon very long soleaacn: Goser, very smooth, flat, and 
= 
gee RR 
