DENTARIA. XIII. CRUCIFERjE. 167 



6. A. DENTATA. Torr. & Gray. 



Plant somewhat scabrous ; radical Ivs. obovate, petiolate, unequally and 

 sharply dentate ; cauline ones oblong, amplexicaul ; pet. minute, spatulate, as 

 long as the sepals ; slig. subsessile ; silique short.- River banks, Western 

 States ! Stem slender, ascending, 1 2f high. Petals white, with a purplish 

 tinge. Siliques 1' in length. Apr. 



16. CARDAMlNE. 



Gr. KapSia, heirt, Ja/zoo), to strengthen ; from its stomachic properties. 



Calyx a little spreading silique linear, with flat, veinless valvep, 

 narrower than the dissepiment, and often opening elastically ; stigma 

 entire ; seeds not margined, with a slender funiculus, 0=. Mostly %. 

 Fls white. 



1. C. HiRsfjTA. (C. Pennsylvania. MuJd.') Pennsylvanian Cardamine. 

 Lvs. pinnate or lyrately pinnatifid ; Ifts. entire, or sparingly repand-den- 



ticulate, those of the radical leaves oval-oblong, of the cauline linear-oblong, 

 the terminal one longest, about 3-lobed ; pet. oblong-cuneate ; siliques erect, 

 with a very short style. or Tj. A variable plant common in wet places 

 throughout Ihe U. S. Stem 8 16' high, mostly smooth. Leaflets 2 5 pairs, 

 4 12" long, smoothish. Fls. small. Siliques about 1' long, 12 18 seeded. Jn. 



2. C. VIRGINIC/A. (C. hirsuta. 0. Hook.) Virginian Cardamine. 



Lvs. lyrately pinnate ; Ifts. with a single tooth on one or both sides ; pet. 

 nearly twice as long as the calyx ; roc. strictly erect ; slig. sessile ; silique long, 

 incurved, erect. (g) A small and delicate species, much resembling the last, 

 but probably distinct. Found on dry hill-sides, Vt. Ct. to Ky. and Mo. Stem 

 4 8' high, slender, leafy. Leaflets 2 4 pairs with a trilobate odd one, oval, 

 L 2" in length, those of the upper leaves 35" long, but very narrow. Petals 

 small. Siliques filiform, 1' long. Jn. 



3. C. PRATENSIS. Field Cardamine. 



St. erect or decumbent, simple ; Ivs. pinnately 7 15-foliate ; Ifts. petio- 

 late, subentire, lower ones suborbicular, upper linear-lanceolate ; sty. distinct. 

 % Swamps, N. Y. to Arctic Am. Whole plant smooth. Stem round, striate, 

 10 16' high. Leaves few, li 2' long including the petiole. Leaflets of the 

 root-leaves 1 3" diam., of the cauline 3 6" by f". Flowers large, few, in a 

 terminal raceme. Petals white or rose-color. Siliques nearly 1' in length, 

 erect. Apr. May. 



4. C. ROTUNDIFOLIA. Michx. (C. rhomboidea. DC. Arabis. Pers. 

 Glabrous or somewhat hairy ; Ivs. entire or repand-toothed, radical ones 

 orbicular-ovate, on long petioles, cauline oval or oblong-lanceolate, petiolate 

 below, sessile above, dentate. 1\. Another variable species with rather large, 

 white or reddish flowers. Stems 6 12' high, angular or striate, mostly erect. 

 Leaves of root 10 18" diam., on petioles 24' long. Racemes about 3' long, 

 12 20-flowered. Petals 2 4 times as long as the calyx. Siliques spreading, 

 612" long. Apr. May. 



a. T. & G. Rt. mostly tuberiferous ; st. erect ; lower stem Ivs. rhomboid-oval ; 

 pet. large. Wet meadows, Conn. Vt. Dr. Robbins. 



/?. T. &. G. Rt. mostly fibrous ; st. decumbent, branching ; Ivs. all petio- 

 late ; pet. smaller, purplish. Shaded springs and rivulets, N. Y. 

 4. C. BELLIDIFOLIA. (C. rotundifolia. Bw. not Michx.} 

 DCS. smooth, radical ones orbicular-ovate, nearly entire, petiolate ; cau- 

 line ones entire or 3-lobed ; siliques erect. A minute species on the summits of 

 the White Mts. Abel Starrs! &c., also Arc. Am. to Calif. Stem 1J 3' high. 

 Leaves mostly radical, broadly oval or ovate, \' long, on petioles as long as 

 .he stems. Fascicles corymbose, each of 3 or 4 white flowers. Petals oval, 

 obtuse, about twice as long as the calyx. Jl. 



17. DENTARIA.. 



Lat dens, a tooth ; from the tooth-like projections of the rhizoma. 



Sepals converging ; silique lanceolate, with flat, veinless, revolute 

 15 



