iSj 



CRUCII'ERAE. 



Vol. II. 



10. Arabis canadensis I.. SicUlc-pod. 

 i'ig. 2078. 



Arabis canadensis L. Sp. PI. 665. 1753. 



Stem nearly simple, i-3 high, pubescent below, gla- 

 brous above. Basal leaves narrowed into a petiole, 

 blunt but sometimes acutish, dentate or lyrately lobed, 

 2'-7' long; stem-leaves sessile, not clasping, lanceolate 

 or oblong, narrowed at each end, tootlied, or the upper 

 entire, pubescent ; pedicels hairy, ascending and 2"-4" 

 long in flower, spreading or recurved and 4"-6" long in 

 fruit; flowers greenish-white, 2"-3" long; petals twice 

 as long as the calyx; pods 2'-3i' long, iJ"-2" broad, 

 scythe-shaped, pendulous ; seeds in I row in each cell, 

 oblong, wing-margined ; style almost none. 



In woods, Maine, Vermont and Ontario to Georgia, west 

 to Minnesota, Kansas. Arkansas and Texas. Ascends to 

 4200 ft. in North Carolina. June-Aug. 



II. Arabia Drummondii A. Gray. Drum- 

 mond's Rock-cress. Fig. 2079. 



A, Drummondii A, Gray, Proc. Am. Acad. 6: 187. 

 1866. 



Turrilis siricta Graham, Edinb. New Phil. Journ. 

 1829 : 350. Not Arabis striata Huds. 



Biennial, glabrous throughout, or the basal 

 leaves sometimes sparingly pubescent; stem erect, 

 8'-3 tall, slightly glaucous. Basal leaves ob- 

 lanceolate, long-petioled, dentate or entire, those 

 of the stem lanceolate to oblong, erect or nearly 

 so, entire, sessile, sagittate; flowers pink or 

 nearly white, 4'-$" long, their pedicels erect ; 

 fruiting pedicels and pods erect or in age slightly 

 spreading; pods 2-4' long, 4"-i*" wide, rather 

 blunt ; seeds in 2 rows in each cell, winged. 



Clififs and rocky soil. Quebec to Connecticut, On- 

 tario, northern Ohio, Illinois, Michigan. British Co- 

 lumbia. Oregon, south in the Rocky Mountains to 

 Colorado and Utah. May-Aug. 



12. Arabis brachycarpa (T. & G.) Britton. 

 Purple Rock-cress. Fig. 2080. 



Turrilis brachycarpa T. & G. Fl. N. A. i : 79. 1838. 

 A. confinis S. Wats. Proc. Am. Acad. 22: 466. 1887. 

 A. brachycarpa Britton, Mem. Torr. Club 5 : 174. 1894. 



Biennial, somewhat glaucous, generally pur- 

 plish, glabrous except at the base, simple or 

 sparingly branched, i-3 high. Basal leaves 

 stellate-pubescent, obovate or spatulate, l'-3' long, 

 dentate, narrowed into a petiole ; stem-leaves 

 sessile, glabrous, auricled at the base, lanceolate 

 or oblong-linear, about i' long, entire or with a 

 few teeth; pedicels spreading, 3"-s" long in fruit; 

 flowers white or pink, 4" broad ; petals twice the 

 length of the calyx ; pods narrowly linear, nearly 

 straight, l'-4i' long, l" wide or less, spreading 

 or loosely ascending; seeds in 2 rows in each 

 cavity, oblong, wing-margined. 



Sandy or rocky soil, Quebec to Manitoba, Assini- 

 boia. \"ermont. western New York, Illinois, Minne- 

 sota, and in the Rocky Mountains to Colorado. June- 

 July. 



