TETRADYNAMIA SIL1QUOSA. 395 



HAB. Pastures, &c. March Oct. ; 'item 612 in. high; JL. 

 small, corymb, wh, . 



289. DRABA. Whitlow-grass. 



D. arabisans : stem leafy, somewhat branched, subpubescent ; leaves 

 lanceolate, acutely dentate ; silicic linear, smooth, longer than the 

 pedicel. 



ELAB. Rocks, $ ; silicle elongated, acuminate, contorted. 



290. LEPIDIUM. Pepper-wort. 



L. virginicum : leaves linear-lanceolate, incisely serrate, smooth ; 

 flowers with 2 4 stamens ; silicle orbicular, emarginate ; stem branch- 

 ed above. 



HAB. Sandy fields. June Oct. <v> ; a foot high, panic, above ; Jl. 

 minute, wh. 



SILiaUOSA. 



291. DENT ARIA. Tooth-wort. 



D. diphylla : stem 2-leaved ; leaflets ternate, subovate, unequally and 



incisely dentate ; root dentate. 

 HAB. Woods. May, 1\. ; stem 68 in. high ; leafl. large, flowers 



yellowish. 



y* 292. CARDAMINE. Lady's smock. 



C. pennsylvanica : smooth, branched ; leaves pinnate, often sublyrate ; 

 leaflets roundish-oblong-obtuse, angularly toothed ; stem erect ; pe- 

 tals oblong-linear. 



HAB. Wet places. May July, Tj.; stem 8 12 in. high; term, 

 leafl large ; si.l. erect. 



b. gracilis : stem slender, weak ; leaves with few and narrow seg- 

 ments. 



HAB. Wet woods. July, 1\. ; stem subdecumb. 4 6 in. long ; ft. 

 minute, wh. 



293. ARABIS. Wall-cress. 



A. sagitta: leaves subdentate, rough, with the pubescence often 

 branched ; radical ones ovate or oblong, attenuated into a petiole ; 

 of the stem lanceolate, sagittate-cordate ; pedicels as long as the ca- 

 lyx ; siliques straight and erect. 



HAB. Hills. June, <v) J* ; stem 1J ft. high, simp., straight ; Jl. 

 small, wh. 



A. tka&anw, ; leaves hairy, mibdentate; radical ones oblong, petiolate ; 



