Rydberg : Studies on the Rocky Mountain Flora 240 



Draba brachystylis sp. nov. 



Perennial with a taproot : stems several, decumbent or ascend- 

 ing with divergent branches, 1-1.5 dm. high, hirsute: basal leaves 

 oblanceolate or spatulate, 1.5—2 cm. long, hirsute with branched 

 hairs ; stem leaves few, oblong or lanceolate, sessile : pedicels 

 short, in fruit 2—5 mm. long, spreading: pod oblong, finely stellate, 

 8—12 mm. long, ascending: style very short, almost obsolete. 



The type sheet of this species is labeled Draba Carolina var. 

 micrantha, but the plant evidently is a perennial and nearest related 

 to D. streptocarpa ; but differs in the divergently branched stem, 

 stellate pod and the almost obsolete style. It grows at an altitude 

 of about 3000 m. 



Utah: Alta, Wasatch Mts., 1879, J/ E. Jones, 135 J (type 

 in herb. N. Y. Bot. Gard.). 



Draba decumbens sp. nov. 



Perennial with a taproot, a short cespitose caudex and a large 

 rosette of basal leaves : stems decumbent, 1—2 dm. high, sparingly 

 pubescent, few-leaved ; basal leaves broadly spatulate, entire, 2-4 

 cm. long, finely grayish stellate, rather thick ; stem leaves ovate 

 to ovate-lanceolate, sessile, entire, 1-2 cm. long : calyx sparingly 

 villous ; petals pale yellow, about 4 mm. long : pedicels very 

 short, in fruit 2—4 mm. long : pod oblong, 8—15 mm. long, densely 

 pubescent, usually twisted : style about i mm. long. 



This is a member of the D. aurca group, and distinguished 

 from all the North American species by its decumbent stems, large, 

 thickish entire basal leaves. 



Colorado: Gray's Peak, 1895, Rydberg {\.y^& in herb. N. Y. 

 Bot. Gard.). 



Draba Macouniana sp. nov. 



Annual, almost scapose : stems ascending or decumbent, less 

 than I dm. high, glabrous and shining ; basal leaves numerous, 

 broadly spatulate or obov^ate, 5—10 mm. long, finely stellate, rather 

 thick ; stem leaf usually one, oval, obtuse, 5 mm. long : petioles in 

 fruit spreading, 6—8 mm. long: petals white, less than 3 mm. long : 

 pod oblong-linear, erect, about i cm. long and 2 mm. wide : style 

 obsolete. 



This species is nearest related to D. crassifolia, but differs in 

 the whiter flowers, and the broad and short basal leaves, which 

 are finely stellate, not hirsute ciliate. The type grew at an alti- 

 tude of about 2000 m. 



