ORDER 13. CRUCIFEILE. 231 



minute, sessile. Common in streams and springy places throughout the country. 

 Aspects various ; st varying from filiform to thick' and fleshy. Lfts. few or many, 

 regular or not, lobed, toothed, angled or entire, always obtuse, terminal one gen- 

 erally 3-lobed. Pods always torulous and straight (except in (3) about 1' loDg. 

 Mar. Jn. 



/?. VIBGINICA Hook. Slender and delicate ; Ifts. 1 or 2-toothed ; pods filiform, 

 incurved. Grows on rocks and sandy shores. 



2 C. pratensis L. CUCKOO FLOWER. St. ascending, simple ; Ivs. pinnately 7 15- 

 foliate, Ifts. petiolate, subentire, lower ones suborbicular, upper linear-lanceolate ; 

 sty. distinct. Ij. Swamps, N". Y. to Arc., Am. Whole plant smooth. St. round, 

 striate, 10 16' high. Lvs. few, 1^ 2' long, including the petiole. Lfts. small 

 or minute, regular. Fls. largo (6 3" broad), few. in a terminal raceme. Pet. 

 white or rose-color. Siliques nearly 1' in length, erect. Apr., May. 



3 C. rhomboidea DC. Sts. simple, erect or ascending, tuberiferous at base; 

 siliques linear-lameolate. If. Wet woods and meadows, 9ommon. Glabrous, 

 8 14' high. Tubers 1 to several, roundish, white, bearing one or several stems. 

 Radical leaves roundish, long-stalked, somewhat cordate, entire; stem Ivs. 

 oblong or rhomboidal, angular-subdentat3, tho upper lanceolate, sessile. Ra- 

 cemes one or two, with white, showy, flowers. Styles 1" long ; stigmas capitate. 

 Apr. Jn. 



{3. PURPURE.A. Torr. Slender, erect, few-leaved and purple-flowered. Cleve- 

 land, 0., &c. May. 



4 C. rotundifolia MX. Sis. decumbent, branching, finally stoloniferous ; Ivs. all 

 petiolate; siliques linear-subulate; rt. fibrous. 74 Cool springs and rivulets in 

 Mts., Penn. to Car. (Buckley). Prostrate stems or runners 1 2f in length. Lvs. 

 roundish, subcordate angular, the- lower 3-lobed or ternate, with the terminal 

 1ft. much the largest. Fls. smaller than in N"o. 3, white. May, Jn. 



5 C. bellidifolia L. Lvs. smooth, orbicular-ovate, nearly entire, petiolate; 

 cauline entire or 3-lobed; siliques erect. 1[ A minute species, on the summits of 

 the White Mts. (Storrs), &c. ; also, Arc.. Am. to Cal. Stem H 3' high. Lvs. 

 mostly radical, broadly oval or ovate, \' long, on petioles as long as the stems. 

 Fascicles corymbous, each of 3 or 4 white flowers. Pet. oval, obtuse, about twice 

 as long as the calyx. Jl. 



6 C. spatulata MX. Lvs. hirsute, the radical spatulate, petiolate ; cauline 

 sessile, siliques spreading '. (D Mts. of Car. and Ga. Sts. decumbent, slender, 

 6 8' long. Lvs. about 1' in length, the lower entire, obtuse ; the upper some- 

 what toothed, narrow. Rac. several, loose, with filiform, spreading, distant 

 pedicels. Fls. white. Pods straight, 1' loag. Apr. 



7. ARABIS, L. ROCK CRESS. (Name from Arabia, the native coun- 

 try of some of the species.) Sepals mostly erect ; silique linear corn- 

 pressed; valves each with one or three longitudinal veins, seeds in a 

 single row in each cell, mostly margined, cotyledons accurnbent or 

 oblique. Fls. white. 



* Leaves (all or at least the radical) pinnatifM Nos. 1, 2. 



* Loaves all undivided, toothed or entire, often clasping, (a) 



n S.liqties short (6 12") and straight. Seeds not winged Nos. 8, 4. 



a Siliques longer (12"), straight or curved. Seeds not winged < Nos. 5. 6. 



a Siiiques long (3'), curved, pendant. Seeds winged boa. 7, 8. 



1 A. Ludoviciana Meyer. All the Ivs. pinnatiftd or pinnate, smoothish; st. 

 branched at base; siliques and pedicels ascending; sds. bordered. CD N. Car. 

 and Ky. (Curtis) to (Macon) Ga. Sts. 610' high, slender. Leaves 12' long, 

 at first rosulate, of 69 pairs of oblong, few-toothed leaflets, rachis slightly 

 winged. Pods 7 10" by 1", valves veiny. Fls. minute, white. Mar., Apr. 



2 A. lyrata L. Upper Ivs. smooth, linear, entire ; radical Ivs. lyrately pinnatifi^, 

 often pilous: st. branched at base; pedicels spreading; siliques erect, seeds hot 

 bordered,-^) On rocky hills, Can. and Wis. to Va. Sts. declined at base, 612' 

 high. Root-lvs. numerous, rosulate, 13' long, i as wide, petiolate, pinnatifid or 

 sinuate-dentate, upper ones sublinear and stfbentire. Fls. middle size (3" long) 



