[From the BULLETIN OF THE Tokri v Bo'J \m< ai Cum:, 31 : 555-575. Oct , 1904.] 



Studies on the Rocky Mountain flora — XII. 



Per Axel Rydberg 



Draba coloradensis sp. nov. 



Annual, leafy below, often branched, 5—10 cm. high ; leaves 

 obovate, entire, 1—2 cm. long, 0.5-1 cm. wide, subsessile, coarsely 

 hirsute, hairs often branched but not truly stellate ; peduncles 

 5 cm. or in fruit often 10 cm. long; raceme short and corymbi- 

 form at first, more elongated in fruit ; sepals oval or oblong, ob- 

 tuse, 1. 5-1.75 mm. long ; petals white, 3-3.5 mm. long, spatulate, 

 emarginate ; fruiting pedicels 4-5 cm. long, divergent ; pods linear- 

 oblong, 10—12 mm. long and nearly 2 mm. wide, hirsute; style 

 none. 



This species belongs to the D. caroliniana group. From that 

 species it differs in the hirsute pods, stouter habit and larger 

 leaves ; from D. micrantha in the large petals, the larger leaves 

 and the more elongated raceme in fruit ; and from D. enncifolia in 

 the entire leaves and the larger pods. It grows on river flats, dry 

 hills and plains at an altitude of about 1500 m. 



Colorado: Fort Collins, river flats, lower Armstrong, 1897, 

 collector not given (type) ; plains near Denver, 1870, E. L.Greene ; 

 Mancos, 1891, Alice Eashvood. 



Draba streptocarpa Grayana var. nov. 



Low and densely cespitose, almost pulvinate ; flowering stems 

 1-3 cm. high, almost scapose ; stem-leaves few and reduced ; even 

 the basal leaves much smaller than in the type. 



It grows at an altitude of 3600-4000 m. 



Colorado: Gray's Peak, Aug. 1895, P. A. Rydberg (type); 

 same locality, 1892, C. S? Crandall j 1 ; mountain west of Como, 

 1895, Crandall & Cowan 41. 



Smelowskia lineariloba sp. nov. 



Densely cespitose ; caudex densely covered by the bases of 

 the dead leaves ; leaves 2-5 cm. long, pinnately divided to the 

 midrib into linear acute divisions, finely stellate and the petioles 

 ciliate ; stems about 1 cm. high, few-leaved ; inflorescence at first 



555 



