Rocky Mountain Flora 251 



Draba sobolifera sp. nov. 



A low cespitose perennial, but the leafy stolons often some- 

 what elongated : basal leaves oblanceolate, obtuse or spatulate, 

 1—2 cm. long and 3—4 mm. wide, sparingly stellate-villous, thick 

 with indistinct midrib : peduncles ^^-6 cm. long, stout, rather 

 many-flowered : petals yellow, obovate, about 4 mm. long, more 

 than twice as long as the rounded sepals : pedicels in fruit y-S 

 mm. long : pod ovate, about 6 mm. long, 3—4 mm. wide, finely 

 stellate : style about 5 mm. long. 



This species is related to D. vctitrosa and D. alpiiia. From 

 the former it differs in the longer leaves and the finer and sparser 

 pubescence ; from the latter in the more elongated stems, the 

 shorter and stellate pod and the shorter styles. It grows at an 

 altitude of about 2500 m. 



Utah : Marysvale, above timber line, 1894, Marats E. Jones, 

 Sc/j;6 (type), jSgje and jSpja.c (all in U. S. Nat. Herb.). 



Draba argyrea sp. nov. 



A cespitose tufted perennial, with underground horizontal 

 stems ; basal leaves obovate, 3-7 mm. long, in dense rosettes, 

 densely and finely stellate, almost silvery ; midvein indistinct : pe- 

 duncles slender, 3—5 cm. long, naked, few-flowered : petals yellow, 

 3 mm. long, obovate, about twice as long as the ovate sepals : pedi- 

 cels in fruit 5—8 mm. long: pods lanceolate, 6—7 mm. long, 2.5— 

 3 mm. wide, minutely stellate : style about i mm. long. 



This species resembles somewhat D. oligospcrnin in general 

 habit and flowers, but the leaves are shorter and broader, more 

 decidedly stellate and without the strong midrib, and the pod is 

 longer. It also reminds one of D. voitrosa but is a more delicate 

 plant with finer pubescence and longer pods. The type grew at an 

 altitude of about 3000 m. 



Idaho : Rock crevices, Sawtooth Mountains, head of Fettit 

 Lake, July, 1895, L. F. Henderson, 353S (type in U. S. Nat. 

 Herb.). 



Draba uncinalis sp. nov. 



Small cespitose and pulvinate perennial : flowering stems scapi- 

 form, 2-3 cm. high, sparingly stellate, leafless ; basal leaves in 

 dense tufts, thick, rounded obovate, 3—4 mm. long, sparingly stellate, 

 with indistinct midrib : inflorescence corymbiform, few-flowered ; 

 pedicels in fruit 4—5 mm. long : pod ovate, 3-4 mm. long and 3 

 mm. wide, glabrous or nearly so : style about 0.5 mm. long. 



