250 TETRADYNAMIA.-SILIQUOSA. 



HAB. Moist rocks. May— June. U. Stem 5—8 

 in. high ; leajl. small, subpubes. ; fl. uh. 



5. C ? teres : leaves sublyrate-pinnatifid ; segment? 



oval-oblong ; the terminal ones somewhat 3-lobed ; 

 siliques short, erect, terete. 

 HAB. Wet places. June — July. tt . 



6. C. hirsuta: leaves pinnate, hairy; leaflets of the 



radical ones roundish, petiolate ; those of the 

 upper ones oblong, subsessile ; petals oblong ; 

 siliques erect. 

 HAB. Pennsylvania. May. ®. 



419. ARABIS. Wali-Cress. Cruciferce. 



1. A. sagittata: leaves subdlntate, rough, with the 



pubescence often branched ; radical ones ovate or 

 oblong, attenuated into a petiole ; of the stem lan- 

 ceolate, sagittate-cordate ; pedicels as long as the 

 calyx ; siliques straight ;.nd erect. 

 HAB. Hills. June. $. Stem 1£ ft. high, simp. , 

 straight ; Ji. small, wk. 



2. A. thaliana : leaves hairy, subdentate ; radical 



ones oblong, petiolate ; stem branched, hairy at 

 the base, siliques ascending ; pedicels much longer 

 than the calyx. 

 HAB. Dry hills. April— May. ©. Stem 2—4 

 in. high, erect; siliq. slend. 



3. A. lyrata: stem and upper leaves smooth and glau- 



cous ; radical leaves lyrate-pinnatifid, often pi- 

 lose ; stem branched at the base ; pedicels spread' 

 ing ; silique erect. 

 HAB. Rocky hills. April— July. £. Stem 8— 

 12 in. high ; caul. leav. lin. ; Ji. large. 

 1. A. laevigata: stem leaves linear, oblong, sagittate, 

 smooth ; the lower ones subdentate ; radical ones 

 obovate ; pedicels erect ; siliques very narrow 

 and long, at length pendulous. 

 HAB. Rocky hills. May. U. Stem 2 ft. high: 

 siL 2\ in. long ; root nerved. 



4. A. canadensis: stem leaves sessile, oblong-lanceo- 



late, narrow at the base, pubescent, pedicles pu- 

 bescent, reflexed in the fruit ; siliques pendulous, 

 sub-falcate, nerved. 



