712 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
1. Flourensia cernua DC. Prodr. 5: 593. 1836. 
TYPE Locatity: Monterey, Mexico, 
Rance: 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 awns. 
1. Encelia scaposa A. Gray, Proc. Amer. Acad. 19: 7. 1883. 
Simsia ? scaposa A. Gray, Pl. Wright. 2:98. 1853. 
TyPE Locauity: Stony hills between the Mimbres and the Rio Grande, New 
Mexico. Type collected by Wright in 1851. 
Rance: 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; 
pale 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..... 02.02.00 e eee 2. LH. 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 Locaurty: ‘Sierra Abayo, New Mexico?” Type collected by Newberry in 
1859, 
RanGeE: Utah and Colorado to northern Arizona and New Mexico. 
New Mexico: Carrizo Mountains (Standley 7350). Dry rocky hills, in the Upper 
Sonoran Zone. 
2. Helianthella quinquenervis (Hook.) A. Gray, Proc. Amer. Acad. 19: 10. 1883. 
Helianthus quinquenervis Mook. Lond. Journ. Bot. 6: 247, 1847. 
Helianthella majuscula Greene, Leaflets 1: 148. 1905. 
TYPE Locauity: ‘Stony ridges, hills of Upper Platte.”’ 
Rance: 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 7. majuscula was collected in the Black Range (Metcalfe 1435). 
3. Helianthella parryi A. Gray, Proc. Acad. Phila. 1863: 65. 1864. 
TYPE Locauiry: Middle Park, near the foot of Pikes Peak, Colorado. 
RanaeE: 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. 
