Vol. 32 



BULLETIN 



No. 3 



OF THE 



TORREY BOTANICAL CLUB 



MARCH, 1905 



Studies on the Rocky Mountain flora — XIV 



Per Axel Rydberg 



c/ 



Macliaeranthera Fremontii sp. no v. 



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 ^21 (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 J/, spectabilis, but that species 

 has entire leav^es and longer green tips to the bracts. It is also 

 related to M. glabrdla and M. ramosa, from which species it dif- 

 fers in the reflexed-squarrose bracts. 



Colorado: Ouray, 1901, Uiiderivood & Selby pja (type), 

 20^, 2o^Sj 201 and 202. 



[The Bulletin for February (32 : 57-122,//. j. 4) was issued 22 Mr 1905.] 



123 



