712 CONTEIBUTIONS PROM THE NATIONAL HERBARIUM. 



1. Flourensia cemuaDC. Prodr. 5: 593. 1836. 



Type locality: Monterey, Mexico. 



Range: Western Texas to southern Arizona and southward. 



New Mexico: Las Palomas; Hachita; Lake Valley; mesa west of Organ Mountains; 

 San Andreas Mountains; Tularosa; Pecos Valley near Texas line. Sandy plains and 

 mesas and low hills, in the Lower Sonoran Zone. 



78. ENCELIA Adans. 



Perennial herb, 30 cm. high or more, with linear entire leaves crowded at the base 

 of the slender scapiform monocephalous stems; rays several, yellow; achenes densely 

 villous, the pappus of 2 chaffy awne. 



1. Encelia scaposa A. Gray, Proc. Amer. Acad. 19: 7. 1883. 



Simsia ? scaposa A. Gray, PI. Wright. 2: 98. 1853. 



Type locality: Stony hills between the Mimbres and the Rio Grande, New 

 Mexico. Type collected by Wright in 1851. 



Range: Known only from type locality. 



We have seen no further specimens of this; apparently it is a very rare plant. 



79. HELIANTHELLA Torr. & Gray. 



Perennial herbs with simple or sparingly branched stems, entire scattered sessile 

 leaves, and large heads with yellow rays; bracts in about 2 series, loose, foliaceous; 

 palese embracing the achenes; ray flowers sterile, those of the disk perfect; achenes 

 compressed, slightly winged on one or both margins. 



KEY to the species. 



Disk flowers purple; rays few, scarcely surpassing the disk 1. H. microcephala. 



Disk flowers yellow; rays numerous, much surpassing the disk. 

 Disk 2 to 3 cm. broad; leaves lanceolate, thin, not strongly 



reticulate, very acute 2. H. quinquenervis. 



Disk less than 2 cm. wide; leaves oblanceolate or narrower, 



thick, strongly reticulate-veined, obtuse or nearly so. 3. H. parryi. 



1. Helianthella microcephala A. Gray, Proc. Amer. Acad. 19: 10. 1883. 

 Encelia microcephala A. Gray, Proc. Amer. Acad. 8: 657. 1873. 



Type locality: "Sierra Abayo, New Mexico?" Type collected by Newberry in 

 1859. 



Range: Utah and Colorado to northern Arizona and New Mexico. 



New Mexico: Carrizo Mountains {Standley 7350). Dry rocky hills, in the Ii'pper 

 Sonoran Zone. 



2. Helianthella quinquenervis (Hook.) A. Gray, Proc. Amer. Acad. 19: 10. 1883. 

 Helianthus quinquenervis Hook. Lond. Journ. Bot. 6: 247. 1847. 



Helianthella majuscula Greene, Leaflets 1:148. 1905. 



Type locality: "Stony ridges, hills of Upper Platte." 



Range: Idaho and South Dakota to Colorado and New Mexico. 



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

 West Fork of the Gila; Black Range; White and Sacramento mountains. Meadows 

 and thickets, in the Transition and Canadian zones. 



The type of //. majuscula was collected in the Black Range (Metcalfe 1435). 



3. Helianthella parryi A. Gray, Proc. Acad. Phila. 1863: 65. 1864. 

 Type locality: Middle Park, near the foot of Pikes Peak, Colorado. 

 Range: Colorado, New Mexico, and Arizona. 



New Mexico: Santa Fe and Las Vegas mountains; Baldy; mountains west of 

 Grants; Vermejo Park. High mountains, in the Canadian and Hudsonian zones. 



