WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 707 



71. RTJDBECKIA L. 



Perennial herbs with alternate, simple or divided leaves and large showy heads 

 terminating the stems or branches; ray flowers neutral, those of the disk perfect; 

 bracts foliaceous, spreading, in about 2 series; receptacle conic or elongated; achenes 

 4-angled, prismatic; pappus a coriaceous, often 4-toothed crown. 



KEY TO THE SPECIES. 



Leaves entire or sparingly toothed ; plants hirsute 1 . R. flava. 



Leaves, except the uppermost, 3 to 5-cleft or pinnatifid; plants gla- 

 brous or nearly so 2 . R. laciniata. 



1. Rudbeckia flava Moore, Pittonia 4: 179. 1900. Black-eyed Susan. 

 Type locality: "Near the Big Muddy, Wyoming." 



Range: Wyoming and North Dakota to Colorado and New Mexico. 

 New Mexico: Santa Fe and Las Vegas mountains; Ensenada; Rio Pueblo. Open 

 slopes and meadows, in the Transition Zone. 



2. Rudbeckia laciniata L. Sp. PI. 907. 1753. Cone flower. 

 RudbecJda ampla A. Nels. Bull. Torrey Club 28: 234. 1901. 



Type locality: "Habitat in Vii'ginia, Canada." 



Range: Idaho and Arizona to Quebec and Florida. 



New Mexico: Tunitcha Mountains; Chama; Santa Fe and Las Vegas mountains; 

 Mogollon Mountains; White Mountains. Along streams and in damp thickets, in the 

 Transition and Canadian zones. 



72. GYMNOLOMIA H. B. K. 



Annual or perennial herbs or low shrubs with chiefly opposite leaves and medium- 

 sized pedunculate heads with yellow rays; involucre hemispheric, with numerous 

 bracts in 2 to 4 series; receptacle conic, chaffy; rays flowers neutral; disk flowers 

 numerous, perfect; achenes obovoid, thickish, somewhat compressed laterally or 

 4-angled, rounded at the summit; pappus none, rarely a ring of 2 to 4 laciniate scales. 



KEY to the species. 



Stems shrubby; disk and receptacle low; leaves pinnately parted 1. G. tenui/olia. 



Stems herbaceous; disk and receptacle high; leaves entire or spar- 

 ingly toothed. 

 Pubescence mostly loose and spreading; leaves (linear or nearly 

 so) conspicuously ciliate for almost their whole length; 



bracts ciliate ; annual 2 . G. ciliata. 



Pubescence mostly or all appressed; leaves ciliate only at the 

 base or not at all; bracts canescent, not ciliate; annuals or 

 perennials. 

 Annuals; leaves linear or linear-lanceolate. 



Leaves linear, often involute; heads 7 to 10 mm. 



broad 3. G. annua. 



Leaves lance-linear or oblong-linear, flat; heads about 



12 mm. broad 4. G. longifolia. 



Perennials; leaves narrowly lanceolate or mostly broader. 

 Leaves lanceolate to linear-oblong, several times as 



long as broad 5. G. multiflcra. 



Leaves elliptic-ovate to ovate or elliptic, less than 



twice as long as broad 6. G. brevifolia. 



