162 CRUCIFER^E. Arabis. 



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

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

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

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

 toothed or the upper 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 H lines wide, beaked by a short thick style or stigma nearly sessile ; valves 

 1-nerved and veined; seeds with a broad orbicular wing. — Spec. ii. 665 ; 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. 



* * * Radical leaves dentate (sometimes nearly entire in A. hirsnta, rarely lyrately pin- 

 natifid in A. Uevir/ata) ; the cauline more or less auriculately lobed at base (except in 

 A. lievif/ata, var. Burkii). 



A. laevigata, Poir. Glabrous throughout and glaucous, usiially 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 pinnatifid ; 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 levigata). 

 A. /leterophylla, Nutt. in Toir. & Gray, Fl. i. 81. Turritis Icevigata, 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, Ceutr. t& S. Pennsylvania; ^ first coll. by 

 /. Burk, 1852. 



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

 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 arcuate-spreading, 3 to 5 inches long, a little over a line 

 broad; seeds uniseriate. — 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, Sulliv. Biennial, 1 to 2 feet liigh : 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, 1 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",^ winged 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, more 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 high, pubescent, rarely nearly 

 glabrous : radical leaves oblanceolate, including the winged petioles an inch or two long ; 

 the cauline sessile, lanceolate or oblong to linear, more or less erect, coarsely toothed or 

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

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

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

 sessile ; valves faintly nerved below the middle and more or less veined ; seeds suborbicular, 

 very narrowly margined. — Fl. Carn. ed. 2, ii. 30. A. sac/ittata, vars. 7 & 5, DC. Syst. ii. 222. 



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



