Ordbk 13.— CRUCIFER^ 231 



minute, sessile. — @ Common in streams and springy places throughout the conntry. 

 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. 



/3. ViRGimoA Hook. Slender and delicate ; lfts. 1 or 2-toothed ; pods filiform, 

 mcurved. — Grows on rocks and sandy shores. 



2 C. prat^nsis L. Cuckoo Plowbk. St. ascending, simple ; his. pinnatdy 1 — 15- 

 foliate, lfts. petiolate, subeniire, lower ones suborbicular, upper linear-lanceolate ; 

 sly. distinct. — ~H Swamps, N. Y. to Arc, Am. Wholo plant smooth. St. round' 

 striate, 10 — 16' higli. Lvs. few, IJ — 2' long, including the petiole. Lfts. small 

 or minute, regular. Pis. large (6^8" broad), few, in a, tormiual raceme. Pet 

 white or rose-color. Siliques naarly 1' in length, ereo^. Apr., May. 



3 C. rhomboJdea DO. Sts. simple, erect or ascending, tuberiferous at base; 

 siliques linear-lanceolate. — 2f Wet woods and meadows, common. Glabrous, 

 8 — 14' high. Tubera 1 to several, roundish, wliito, bearing one or several stems. 

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

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

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

 Apr. — Jn. 



/?. PUEPUREA Torr. Slender, erect, few-leaved and purple-flowered. — Cleve- 

 land, 0., &c. May. 



4 C rotundifolia Mx. Sts. decumbent, branching, finally stoloniferous ; lvs. all 

 petiolate ; siliques linear-subulate ; rt. fibrous. — 11 Cool springs and rivulets in 

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

 roundish, suboordate angular, the lower 3-lobod or ternate, with the terminal 

 1ft. much the largest. Pis. smaller than in So. 3, white. May, Jn. 



5 0. bellidifdlia 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, Are., Am. to Cal. Stem 1 J — 3' high. Lva 

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

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

 as long as the calyx. Jl. 



6 C spatrulata Mx. Lais, hirsute, the radical spatulate, petiolate ; caulino 

 sessile, siliques spreading. — (I) Mts. of Car. and &a. 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. Pis. white. Pods 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 

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

 oblique. — Fls. white. 



* Leaves (all or at least the radical) pinnatiftd ...'. Nob. 1, 2. 



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



a Biliques short (6 — 12'0 and straight. Seeds not winged Nos. 3, 4. 



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



a Siliques long (3'), curved, pendant. Seeds winged Nos. 7, 8. 



1 A. Iiudoviciana 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 rasulate, of 6—9 pairs of oblong, few-toothed leaflets, rachis slightly 

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



2 A. lyr^ta 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 Ta. Sts. declined at base, 6 — 12' 

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

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



I 



