702 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



1. Cosmos parviflorus (Jacq.) H. B. K. Nov. Gen. & Sp. 4: 241. 1820. 



Coreopsis parviflora Jacq. PI. Hort. Schonbr. 3: 65. pi. 374- 1798. 



Cosmos bipinnatus parviflorus A. Gray, PI. Wright. 2: 90. 1853. 



Type locality: Not known. 



Range: Western Texas to southern Arizona and southward. 



New Mexico: Santa Fe and Las Vegas mountains; Las Huertas Canyon; Laguna 

 Blanca; Gallinas Mountains; Fort Bayard; Mogollon Mountains; Hop Canyon; Han- 

 over Mountain; San Luis Mountains; Organ Mountains; Gray; White Mountains. 

 Meadows and along streams, in the Upper Sonoran and Transition zones. 



64. THELESPERMA Less. 



Slender annual or usually perennial, strong-scented, glabrous herbs, with opposite, 

 finely dissected leaves and long-pedunculate, radiate or discoid heads of yellow 

 flowers; inner bracts united to form a cup, the outer shorter and narrow, connate at 

 the base with the inner; rays, when present, about 8, bright yellow; achenes tend' 

 or slightly obcompressed, narrowly oblong to linear, neither margined nor beaked, 

 crowned with a pair of stout persistent awns, or pappus sometimes wanting. 



KEY TO THE SPECIES. 



Rays present. 



Leaf segments linear-filiform, 1 mm. wide or less; leaves scat- 

 tered along the stems 1 . T. trifidum. 



Leaf segments linear or broader, 2 mm. wide or more; leaves 



clustered at the base of the stems 2. T. subnudum. 



Rays wanting. 



Lobes of disk corollas lanceolate; peduncles much shorter 

 than the leafy stems; leaves scattered along the stems; 

 heads about 10 mm. broad 3. T. gracile. 



Lobes of disk corollas ovate; peduncles much exceeding. the 

 leafy stems; leaves crowded at base of stems; heads 6 

 mm. wide or less 4. T. longipes. 



Thelesperma ambiguum and T. subsimplicifolium have been reported from New 

 Mexico, but the specimens apparently are referable to T. trifidum. 



1. Thelesperma trifidum (Poir.) Britten, Trans. N. Y. Acad. 9: 182. 1890. 

 Coreopsis trifida Poir. in Lam. Encycl. Suppl. 2: 253. 1811. 

 Cosmidiumfilifolium Torr. & Gray, Fl. N. Amor. 2: 350. 1842. 

 Thelesperma filifolium A. Gray, Journ. Bot. Kew Misc. 1: 252. 1849. 

 Thelesperma formosum Greene, Pittonia 5: 56. 1902. 



Type locality: North America. 



Range: Nebraska and Colorado to New Mexico and western Texas. 



New Mexico: Pecos; between Santa Fe and Canyoncito; Socorro; Elk Canyon; 

 Gallinas Mountains; Nara Visa. Plains and low hills, in the Upper Sonoran Zone. 



The type of T. formosum is Heller's 3747, collected between Santa Fe and Canyon- 

 cito. 



2. Thelesperma subnudum A. Gray, Proc.Amer. Acad. 10: 72. 1875. Navaho tea. 

 Type locality: St. George, southern Utah. 



Range: Utah and Colorado to New Mexico and Arizona. 



New Mexico: Carrizo Mountains (Standley 7307). Dry plains and rocky hills, in 

 the Upper Sonoran Zone. 



3. Thelesperma gracile (Torr.) A. Gray, Journ. Bot. Rew Misc. 1: 253. 1849. 

 Bidens gracilis Torr. Ann. Lye. N. Y. 2: 215. 1827. 



Type locality: "On the Canadian ?," New Mexico or Colorado. 

 Range: Nebraska and Colorado to western Texas and Arizona. 

 New Mexico: Common throughout the State. Plains and low hills, in the Upper 

 Sonoran Zone. 



