OF ARTS AND SCIENCES. 259 



very short and thick. — On the White Mountains of Mono County, 

 California, at 13,000 feet altitude ( W. H. Shockley, July, 1886). 



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



-»- Flowers yellow. 

 ++ Lower leaves often an inch long or more. 



21. D. hyperkorea, Desv. Pubescence of very short brandling hairs : 

 caudex stout, simple : leaves coarsely toothed, oblanceolate, or the cauline 

 oblong-obovate : corymb broad : pods obtuse, broadly elliptical to narrowly 

 oblong, usually glabrous, on spreading pedicels; style short. — Alaska, from 

 Sitka to the Aleutian and St. Paul's Islands. 



22. D. chrysantha, Watson. Caudex much branched ; stems glabrous or 

 loosely pubescent : leaves deep green, very narrowly oblanceolate to linear, 

 rarely few-toothed, usually glabrous or sparingly ciliate : pods glabrous, oblong 

 to oblong-lanceolate, on usually short pedicels ; style short, slender. — Proc. 

 Am. Acad. 17. 361. High peaks of Colorado and Arizona. 



23. D. streptocarpa, Gray. Thinly villous with long simple or branched 

 hairs ; caudex simple or sparingly branched : leaves oblanceolate to (the cauline) 

 oblong or lanceolate, rarely toothed, ciliate and villous : pods lanceolate, usually 

 twisted, glabrous or pubescent on the margin, exceeding the ascending pedi- 

 cels ; style slender. — Am. Journ. Sci. 2 ser. 33. 242. Mountains of Colorado 

 and New Mexico ; an Arizona form approaches the next. 



24. D. adrea, Vahl. Pubescent throughout with short stellate hairs, occa- 

 sionally subpilose : leaves usually narrow, frequently ciliate at base : pods 

 lanceolate to linear, acute, rarely glabrous ; style short and stout, — otherwise 

 like the last, — Greenland ; Rocky Mountains, from British America to New 

 Mexico and Arizona ; Mignon Island, Gulf of St. Lawrence. A form with 

 ovate pods occurs in Utah and Colorado. 



Var. stylosa, Gray. Style very slender, a line long. — New Mexico {Fend- 

 ler). A doubtful form from New Mexico and Arizona has broad ovate and 

 entire cauline leaves. 



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



25. D. aureola, Watson. Eather densely stellate-pubescent throughout; 

 caudex simple or branched ; stem stout, simple : leaves numerous, oblanceolate, 

 obtuse, entire, the cauline oblong : raceme short and dense ; calyx glabrous ; 

 pods broadly oblong, obtuse, pubescent, flat, on short spreading pedicels ; style 

 short and stout. — Bot. Calif. 2. 430. Lassen's Peak, California. 



26. D. corrugata, Watson, 1. c. Pubescent throughout with loose branch- 

 ing hairs ; stems branching from the base, very leafy : leaves entire, oblong- 

 oblanceolate : calyx pubescent : pods lanceolate to broadly oblong, acute or 

 obtuse, much corrugated and twisted ; style long, attenuate to a minute stigma. 

 — San Bernardino Mountains, California. 



•»- -t- Flowers white. 



•m- Stems simple or sparingly branched. 



= Cauline leaves usually several to many. 



27. D. incana, Linn. Stellate-pubescent throughout, usually loosely ; caudex 

 often simple : leaves few-toothed or entire, oblanceolate or the cauline Ianceo- 



