108 CRUCIFERtE. Draba. 



usually simple, but sometimes a little branching from the base : pubescence 

 simple or forked. Flowers very small, yellow: petals about twice as long as 

 the calyx. Silicle 4 lines long, rather obtuse : stigma sessile. — Hooker's 

 reference to Nuttall's Genera is a mistake, as Nuttall has no D. lutea. Not 

 very distinct from the next species. 



25. D. nemoralis (Ehrh.) : pubescent; stem branched; leaves oval; 

 cauline ones lanceolate, toothed ; silicles oblong-elliptical, pubescent, nearly 

 30-seeded, one-third the length of the pedicels. Hook. — DC.prodr. l.p. 171; 

 Hook ! fl. Bor.-Am. 1. p. 55. 



a. flowers yellow ; petals nearly entire. Hook. I. c. 



fi. flowers nearly white ; petals emarginate. Hook. I. c. 



N. W. Coast and Subarctic America ! P. Plains of the Rocky Mountains, 

 Nuttall ; Fort Gratiot, Michigan, Dr. Pitcher ! — Stem slender, 3-4 inches 

 high, pubescent below, glabrous above. Leaves hirsute. Flowers minute. 

 Pedicels very long. Petals emarginate, longer than the hairy calyx. — Our 

 specimens from Dr. Pitcher have glabrous fruit. 



26. D. muralis (Linn.): pubescent; stem branching, leafy; leaves 

 broadly ovate ; cauline ones cordate, somewhat clasping, strongly toothed ; 

 silicles oblong-elliptical (glabrous, DC.)., about 16-seeded,a little shorter than 

 the pedicels (flowers white). Hook. — Eng. hot. t. 192 ; DC. prodr. 1. p. Ill ; 

 Hook.fi. Bor.-Am. 1. p. 56. 



About Montreal. Petals entire or notched, upon the same plant. Hook. 

 — The last three species are in much confusion, which we have not the 

 means of clearing up, and we have therefore very closely followed Hooker, 

 who, however, is far from being satisfied with his own account of them. 



27. D. cuneifolia (Nutt.): hirsute-pubescent; stem branching below; 

 leaves sparingly toothed ; radical ones spatulate-oblong ; cauline ones few, 

 oblong-ovate, somewhat attenuate at the base; racemes rather elongated in 

 fruit ; silicles oblong-lanceolate, minutely hispid, twice as long as the pedi- 

 cels ; petals (white) emarginate. — Niitt. ! mss. in herb. Hook. 



Grassy places around St. Louis, Missouri; also in Arkansas and West 

 Florida, Nuttall ! Kentucky, Short ! March- April. — Very pubescent , the 

 hairs branching. Plant 3-8 inches high ; the lower part only clothed with 

 leaves, slender. Radical leaves an inch and a half long, and three-fourths of 

 an inch broad. Flowers rather large : petals nearly three times as long as 

 the calyx. Silicles 6-7 lines long, minutely hispid, especially on the margin, 

 diverging horizontaUy ; cells about 15-seeded : style none. 



28. D. platycarpa: canescently hirsute with branching hairs; stem 

 branching below, the branches leafy ; leaves remotely toothed ; radical ones 

 obovate ; cauline oblong, closely sessile ; racemes elongated in fruit ; silicles 

 obovate-oblong, minutely hispid, shorter than the pedicels ; petals (white) 

 emarginate. 



Texas, Drummond! — Stem 3-8 inches high, divergingly branched below. 

 Leaves about an inch long, with 2-3 distinct teeth on each side. Petals 

 broadly obovate ; the claw short : limb deeply emarginate. Silicles on spread- 

 ing pedicels, 3-4 lines long and nearly 2 lines broad, very obtuse ; cells 25- 

 30-seeded. 



29. D. hrachycarpa (Nutt. mss.) : minutely pubescent, simple or branch- 

 ed ; radical leaves roundish-ovate, petioled, cauline oblong or linear, minutely 

 (about 2-) toothed, or entire; racemes many -flowered, strict, elongated in 

 fruit (flowers Avhile) ; silicles oval, glabrous, about the length of the pedi- 

 cels; cells 5-6-seeded ; style very short; petals entire. — Alyssum bidentatum, 

 Nutt. ! in herb. Hook. 



fi. fastigiata (Nutt. mss.) : more pubescent ; stem mostly simple ; radical 

 leaves mostly 4-toothed ; silicles pubescent. 



