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 /?) about 1' long. 

 Mar. — Jn. 



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

 huurved. — Grows on rocks and sandy shores. 



2 C. pratensis L. Cuckoo Flower. St. ascending, simple ; Ivs. pinnately 1 — 15- 

 foliate, If Is. peliolale, subentire, lower ones suborbicular, upper linear-lanceolate • 

 sty. distinct. — If 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. large (6 — 3" broa 1). 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, iuberiferous at base; 

 siliques linear-lanceolate. — 1( Wet wood-? and meadows, common. Glabrous, 

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

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

 oblong or rhomboidal, angular-subdentate, the upper lanceolate, sessile. Ra- 

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

 Apr. — Jn. 



(S. purpurea Torr. Slender, erect, few-leaved and purple-flowered. — Cleve- 

 land, 0., &c. May. 



4 C. rotuiidifolia Mx. Sl3. decumbent, branching, finally stoloniferous ; lvs. all 

 petiolate; siliques linear -subulate ; rt. fibrous — If 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 

 lft. much the largest. Fls. smaller than in No. 3, white. May, Jn. 



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

 cauline entire or 3-lobed; siliques erect. — 2/ A minute species, on the summits of 

 the White Mts. (Storrs), &c. ; also, Arc, Am. to Cal. Stem 1^ — 3' high. Lvs. 

 mostly radical, broadly oval or ovate, J' 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. — CD 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. Pod3 straight, 1' long. Apr. 



7. ARABIS, L. Rock Cress. (Name from Arabia, the native coun- 

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

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

 6ingle row in each cell, mostly margined, cotyledons accumbent or 

 oblique. — Fls. white. 



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



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



a Siliques short (6—12") and straight. Seeds not winged Nos. 3, 4. 



a Siliques longer (1 — 2'), straight or curved. Seeds not winged Nos. 5. 6. 



a Siliques long (3'), curved, pendant. Seeds winged I\os. 7, 8. 



1 A- Imdoviciana Meyer. All the lvs. pinnatifid or pinnate, smooihish; st. 

 branched at base ; siliques and pedicels ascending ; sds. bordered. — (D N. Car. 



. and Ky. (Curtis) to (Macon) Ga. Sts. 6—10' high, slender. Leaves 1—2' long, 

 at first rosulate, of 6—9 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 lvs. smooth, linear, entire ; radical lvs. lyrately pinnatifid, 

 often pilous; st. branched at base; pedicels spreading; siliques erect, seeds not 

 bordered.—® On rocky hills, Can. and Wis. to Va. Sts. declined at base, 6 — 12' 

 high. Root-lvs. numerous, rosulate, 1 — 3' long, i as wide, petiolate, pinnatifid or 

 einuate-dentate, upper ones subliaear and subentire. Fls. middle size (3" long). 



