46 CRUCIFERjE. ARABIS. 



STKKPTAXTHUS. 



A. ColumMana Macoun Cat. Canada PI. ii, 304. Winter annual: al- 

 most smooth or pubescent below with branching hairs : lower leaves 

 slightly toothed and tapering into a petiole ; cauline sessile and often clasp- 

 ing : flowers white :'pods exactly sickle- shaped, 3-4 inches long. Common 

 on the lower slopes of mountains, northern Washington to Brit. Columbia. 



A. eanescens T. & G. Fl. i, 83. Finely stellate-pubescent throughout : 

 stems one to several from a perennial or biennial root, 2-8 inches high ; 

 simple or branched : lower leaves linear-oblanceolate, an inch long or less ; 

 cauline leaves linear, clasping but hardly auriculate: flowers small 2 lines 

 or less long, pale: pods pendulous, pubescent or glab rate, 1-1 % inches 

 long by less than a line broad, on pedicels 1-3 lines long; valves 1 -nerved 

 to the middle: seeds small, orbicular, winged, in 1 or 2 rows. On dry 

 plains, Blue Mountains and Harney valley Oregon, to the Rocky 

 Mountains and Brit. Columbia. 



A. arcnata Gray Proc. Am. Acad. vi, 187 (?). More or less stellate- 

 pubescent or hirsute : stems erect, 6 inches to 2 feet or more high from a 

 perennial woody caudex, simple or branched ; lower leaves spatulate, entire 

 or denticulate acute, 1-2 inches long; cauline oblong-lanceolate, sagit- 

 tate and clasping at base &-12 lines long or more ; racemes rather few-flow- 

 ered; flowers pale nodding; petals 3-4 lines long, white or purple, twice as 

 long as the sepals: pods 1-4 inches long by aline or more broad erect 

 and slightly curved or spreading and strongly falcate. On rocky ridges 

 and dry plains, eastern Oregon and Washington to southwestern Oregon. 



A. subpinnatifida Watson Proc. Am. Acad. xx, 353. Canescent with a 

 yury fine and dense stellate pubescence : stems 1 to several from a branch- 

 ing somewhat woody base : lower leaves crowded and persistent, linear- 

 oblanceolate, entire or sparingly toothed, 9-12 ^ines long; upper ones 

 lanceolate, coarsely and subpinnatifidly toothed : flowers pale pink, 3~{> 

 lines long: pods strongly reflexed, on pedicels 2-5 lines long, 1/^-3 inches 

 long, \-\Yz lines broad, more or less attenuate to the short style, pubes- 

 cent, slightly curved; valves 1-nerved to the middle and veined; seeds in 

 one row, as broad as the partition, winged. On dry rocky ridges, south- 

 western Oregon and and adjacent California to northwestern Nevada. 



7 STREPTANTHUS Nutt. Jour. Acad. Philad. v, 134, t. 7 . 



Caulescent branching herbs with entire or toothed, or rarely 

 pinnatifid leaves and purple white or yellowish flowers. Sepals 

 o^a-te or oblong usually colored, equal at base (rarely one or both 

 pair saccate J, commonly comiivent. Petals often without a di- 

 latt d blade, more or less twisted or undulate ; the claw chan- 

 ireled. Stamens 6, the longer pair often connate below. Anthers 

 more or less elongated, sagittate at base. Pods sessile upon the 

 'enlarged receptacle, oblong to narrowly linear compressed to sub- 

 terete : valves 1-nerved; partition hyaline: stigma simple. Seeds 

 flat, margined or winged. Cotyledons accumbent. Ours all of 



EUKLISIA T. & G. Fl. i, 67. Petals narrow, the blade but 

 little if any broader than the claw, undulate crisped. Calyx 

 closed or with spreading tips. 



S. orbicnlatus Greene Fl. Francis. 258. Glabrous and glacous : stems 

 erect from an annual or biennial root, 6-18 inches high, diffusely branched 

 from the base: lowest leaves round obovate, very qbtuse or even truncate, 

 crenately or more remotely and repandly toothed, abruptly narrowed to a 

 petiole 'ta lorg as the bfade: middle cauline obovate-spatulate, auricled 

 and clasping ; uppermost orbicular, mostly entire, obtuse, sepals purple, 



