110 CRUCIFER.^. Di-aha. 



41. — Greenland and jierJiaps also (the original specimens) from tlie western coast of 

 Baffin's Bay. Many of the specimens from Greenland and SjMtzbergeu that have been 

 referred to it appear to belong, some to D. alpina and others to D. hirta. ■ 



* * Caulescent; stems few- or many-leaved: leaves entire or few-toothed. 



■i-r Flowers yellow. 



++ Lower leaves often an inch long or more. 



D. hyperborea, Dks^v. More or less ])ubcscent with very .^hort brandling hairs; camlex 

 .stout, siniiile ; steins simple or branched, (lccunil)ent, a span high or less : leaves oblanccolate, 

 coarselv toothed, 1 to 4 inches long including the broadly winged petiole ; the cauline some-* 

 times obloug-obovate : flowers in a broad corymb : pods broadly elliptical to narrowly ob- 

 long and obtuse (var. spatulata, Gray), 3 to 9 lines long, usually glabrous, on spreading 

 pedicels 3 to 6 lines long; style half line long.— Jour. Bot. iii. 172 (1814). Ali/ssum 

 liiiperlmreum, L. Spec. ii. 6.^)1. D. (jraudis, Langsd. in DC. Syst. ii. 355; Deless. Ic. Sel. 

 ii. 14, t. 47. Cochlcaria spathiilata & C. siliijuosa, Schlecht. in DC. Syst. ii. 369. C. seplen- 

 triimtills DC. Prodr. i. 174, not Schleciit. — Alaska, from Sitka to the Aleutian Islands and 

 St. Paul's Island. 



D. chrysantha, Watson. Cespitose ; the caudex much-branched ; stems 1 to 5 inches 

 hitjh. t;labr(nis or loosely pubescent: leaves deep green, very narrowly oblanceolate ; the 

 few cauline linear to lanceolate, rarely few-toothed, glabrous or sparingly ciliate or somewhat 

 pubescent, -J to 2 inches long: flowers bright yellow becoming whitish : calyx somewhat 

 villous : pods glabrous, oblong to oblong-lanceolate, 3 to 6 lines long: pedicels usually short, 

 1 to 5 lines long : style slender, about half line long. — Proc. Am. Acad. xvii. 364. — IligJi 

 peaks of Colorado, frequent ; peak south of Apache Pass, Arizona, Lcmuwn. 



D. Streptocdrpa, Gray. Thinly villous with long spreading simple or branched hairs : 

 caudcK simple or sparingly branched ; stems erect, simple or strictly branched, an inch to a 

 si)au liigh : leaves oblanceolate, or the cauline oblong or lanceolate, acute, rarely slightly 

 toothed, ciliate and more or less villous, 3 to 18 lines long: calyx glabrous or somewhat 

 ■villous : pods lanceolate, acute or acuminate, usually twisted, glabrous or often pubescent on 

 the margin, 3 to 6 lines long, on pedicels half as long; style slender, a line long. — Am. 

 Jour Sci. ser. 2, xxxiii. 242. — Mountains of Colorado and New Mexico; Huachuca and 

 Santa Rita Mountains, Arizona, Lemmon, Pringle, a stellate-pubescent and but slightly 

 villous form, nearly approaching the following. 



D. aurea Vahl. Pubescent throughout with short stellate hairs and occasionally somewhat 

 pilose : caudex simple or sparingly branched ; stems usually rather stout, erect, usually 

 branched from the base upward, leafy, 2 to 15 inches high: leaves oblanceolate or the cauline 

 lanceolate, usuallv narrow, frequently ciliate at base, i to 2 inches long : calyx more or less 

 pubescent: petals bright yellow to nearly white: pods lanceolate to linear, acute, pubescent 

 (rarely glabrous), often twisted, 3 to 6 lines long, on pedicels half as long; style half line 

 long or less. — Vahl in Hornem. Fors. fEc. Plantel. ed. 2, 599 ; Fl. Dan. t. 1460 ; Hook. Bot. 

 Mag. t. 2934. — In the Rocky Mountains from Mt. Selwyn, Brit. America, to New Mexico 

 and Utah; Arizona, Santa Rita Mountains, Prinf/Ie, Mt. Graham and Mt. Agassiz, Lemmou, 

 the last with glabrous pods ; Mignon Island, Gulf of St. Lawrence, Linden. A form with 

 ovate pods has been collected in the Uinta Mountains, Utah, Walson, and in the Sawatch, 

 Bmnilef/ee. (Greenland.) 



Var. stylosa, Gray, 1. c. 243. Styles very slender, a line long. — Near Santa Fe'. New 

 Mexico, Findler. Doubtful specimens collected by Bi;/elow near Albuquerque, New Mexico, 

 and bv Rothrork in Sauoita Valley, Arizona, have some of the cauline leaves broad and 

 ovate. 



++ ++ Leaves small, half inch long or less. 



D. aureola, Watso\. Rather densely stellate-pubescent throughout ; caudex simple or 

 branched ; stems short, simple, 4 inches high or less : leaves oblanceolate ; the cauline oblong, 

 obtuse, entire, half inch long: raceme dense in flower and frnit: calyx glabrous: pods 

 broadly oblong, obtuse, pubescent, not twisted, 4 to 5 lines long, on spreading; pedicels 2 or 

 3 lines lonf^ ; style short (half line long), stout. — Bot. Calif, ii. 430. — Lassen's Peak, Calif., 

 Lemmon, Mrs. Austin. 



D. corrugata, Watsox, 1. c Pubescent throughout with loose branching hairs : caudex 



