[From the Bulletin of the Tokkey Hktanical Club, 32 : 123-138 1905. 



Studies on the Rocky Mountain flora — XIV New yorjc 



Per Axel Rydberg 



BOTANICAL 

 QARI>EN 



Machaeranthera Fremontii sp. nov. 



Biennial with thick taproot ; stems several, glandular-hispid 

 and somewhat puberulent, 4—5 dm. high, branched ; basal leaves 

 oblanceolate, petioled, glandular-hispid and scabrous, sharply den- 

 tate ; upper leaves sessile, linear or lanceolate ; heads over i cm. 

 high ; bracts linear-lanceolate, cinereous, acuminate, well imbri- 

 cated ; herbaceous tip short, lanceolate, only slightly squarrose ; 

 rays purple, 8—10 mm. long; achenes densely strigose ; pappus 

 brownish or reddish. 



It grows in black soil of river bottoms. 



Colorado: "Platte Waters," 1844, Fremont 421 (type in 

 herb. Columbia Univ.). 



Machaeranthera Selbyi sp. nov. 



Biennial ; stem reddish, branched above, glabrous below, pu- 

 berulent or minutely strigose above, only slightly glandular in the 

 inflorescence ; lower leaves linear-oblanceolate to oblanceolate, 

 petioled, glabrous or rarely slightly puberulent, dentate and ciliate on 

 the margin ; upper leaves linear ; inflorescence branched and open ; 

 heads about i cm. high ; bracts in many series, well imbricated ; 

 glandular green tips small, lanceolate, strongly reflexed-squarrose ; 

 achenes minutely strigose. 



This is perhaps nearest related to M. spcctabilis, but that species 

 has entire leaves and longer green tips to the bracts. It is also 

 related to M. glabrclla and M. ranwsa, from which species it dif- 

 fers in the reflexed-squarrose bracts. 



Colorado: Ouray, 1901, Underwood &" Selby gja (type), 

 204, 20^s, 201 and 202. 



123 



