162 CRUCIFER.E. Arabis. 



A. Canadensis, L. (Sickle-pod.) Stems erect, tall, solitary, simple or rarely branched 

 above, spariugly hirsute near the base with forked hairs : radical leaves soon disappearing, 

 obovate or oblong, petiolate, 1 to 3 inches long, sometimes lyrate or runcinate; cauline 

 narrowly oblauceolate (widest above the middle), acute or acuminate, sessile, remotely 

 toothed or the ujiper entire, somewhat pubescent with short simple or branched hairs : 

 flowers spreading or pendulous in a soon open raceme : pedicels and calyx pubescent : petals 

 white, narrow, '2 lines long, twice longer than the sepals : pods pendulous, falcate, 2 to 3 

 inches long by 1^ lines wide, beaked by a short thick style or stigma nearly sessile ; valves 

 1-uerved and veined ; seeds with a broad orbicular wing. — Spec. ii. 6G5 ; Deless. Ic. Sel. ii. 

 9, t. 28. A. falcata, Michx. Fl. ii. 31. — From New England to Ontario and Minnesota and 

 southward to Georgia and Texas ; fl. June. 



* * * Eadical leaves dentate (sometimes nearly entire in A. hiisnta, rarely lyrately pin- 

 natifid in A. Icevigata) ; the cauline more or less auriculately lobed at ba.«e (except in 

 A. Iceviijata, var. Burkii). 



A. laevigata, Poir. Glabrous throughout and glaucous, usually tall, simple or often 

 branched above : radical leaves spatulate and toothed to lyrately pinnatifid ; cauline oblong- 

 lanceolate to linear ; the lowest usually petioled and sometimes piuuatifid ; the rest sessile 

 and toothed or entire, 1 to 6 inches long: flowers on ascending or somewhat spreading 

 pedicels: petals narrow, white or purplish, 2 to 4 lines long, half longer than the sepals 

 pods loosely spreading on pedicels 2 to 5 lines long, straight or often recurved, 2 to 4 inches 

 long by two thirds line broad, beaked by a usually very short stout style or the stigma 

 sessile; valves thin, faintly 1-nerved; seeds elliptical, winged. — Suppl. i. 411 (as leviyaUt). 

 A. heterophyUa, Nutt. in Torr. & Gray, Fl. i. 81. Turritis Iceriqata, Muhl. in Willd. Spec, 

 iii. 543. — Quebec and Ontario to Minnesota and southward to N. Carolina, Tennessee, and 

 Arkansas. 



Var. Burkii, Porter. Leaves narrower; the cauline linear to linear-lanceolate, 

 entire, scarcely or not at all auricled at the base: flowers smaller: petals about equalling 

 the sepals. — Bull. Torr. Club, xvii. 15. — Dry hills, Centr. & S. I'ennsylvania ; i first coll. by 

 /. Burk, 1852. 



A.* atrorubens, Suksdukf. Erect, l to 3 feet high, scabrous-pubescent upon the oblau- 

 ceolate obtuse dentate basal leaves : stem and broadly lanceolate or ovate-oblong cauline 

 leaves quite glabrous and somewhat glaucous : pedicels and calyx puberulent : flowers rather 

 large, very dark- purple, almost black, about 4 lines in length : pods at first ascending 

 or almost erect but soon widely arciuite-spreading, 3 to 5 inches long, a little over a line 

 broad; seeds uuiseriate. — Suksdorf in Greene, Erythea, i. 223. — Rocky ground on moun- 

 tain summits, Klikitat Co., Washington, Suksdorf; and earlier in the Simcoe Mts., J. Howell. 



A. patens, Sclliv. Biennial, 1 to 2 feet high : .stems erect, simple or branched, pubescent 

 throughout with spreading mostly simple hairs, or very rarely with some fine stellate hairs, 

 or rarely glabrous above : radical leaves ovate and petiolate to oblanceolate ; cauline lanceo- 

 late, .sessile with clasping auriculate base, acutish to short-acuminate, mostly somewhat 

 serrate, I to 2^ inches long : petals white, 3 to 4 inches long, twice longer than the sepals : 

 flowers on spreading pedicels : pods spreading, 1^ to 3 inches long by one half to two thirds 

 line wide, attenuate to a slender style ; valves faintly 1-nerved to the middle ; fruiting pedi- 

 cels 4 to 12 lines long; seeds oblong, narrowly Avinged at the lower end. — Am. Jour. Sci. 

 Ixii. 49; Gray, Gen. 111. i. 142, t. 58. — Pennsylvania and Ohio to N. Alabama. 



A. hirsuta, Scop. Biennial, m^re or less hirsute, at least at the base, with spreading simple 

 or forked hairs (rarely stellate upon the leaves): stems erect, solitary or several from a 

 branching caudex, simple or strictly branched, 1 to 3 feet liigh, pubescent, rarely nearly 

 glabrous: radical leaves oblanceol.ate, including the winged petioles an inch or two long; 

 the cauline ses.sile, lanceolate or oblong to linear, more or less erect, coarsely toothed or 

 nearly all entire, even the uppermost more or less hairy or ciliate, cordate or auricled at 

 base: petals greenish white, \\ to 3 lines long : pods strictly erect on slender pedicels, very 

 narrow, 1 to 2 inches long, half line broad ; style vorv short and stout or the stigma nearly 

 sessile; valves faintly nerved below the middle and more or less veined ; seeds suborl)icular, 

 very narrowly margined. — Fl. Carn. ed. 2, ii. 30. ^1. sar/iltata, vars. y & S, DC. Syst. ii. 222. 



1 Also at Roanoke, Va., ace. to Small & Heller, Mem. Torr. Club, iii. pt. 1, 1, 22. 



