666 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Type Locatity: Valley of the Rio Grande, 60 or 70 miles below El Paso, Texas. 
Ranae: Western Texas to southern New Mexico. 
New Mexico: Along the Rio Grande; Carlsbad; Tucumcari. Dry hills and plains, 
in the Lower Sonoran Zone. 
3. Isocoma heterophylla (A. Gray) Greene, Erythea 2: 111. 1894. 
Linosyris heterophylla A. Gray, Pl. Wright. 1: 95. 1852. 
Linosyris hirtella A. Gray, loc. cit. 
TyrE Locauity: Valley of the Pecos, western Texas. 
Rance: Western Texas to Arizona and southward. 
New Mexico: Carrizo Mountains; Bueyeros; Socorro; Sabinal; Laguna; Horace; 
Albuquerque; Mesilla Valley; White Sands; White Mountains; Roswell. Dry plains 
and low hills, in the Lower and Upper Sonoran zones. 
21. CHRYSOMA Nutt. 
Low densely branched shrub, 60 cm. high or Jess, with linear-acerose rigid resinous- 
punctate crowded leaves and very numerous small heads of bright yellow flowers in 
dense cymose clusters; bracts of the involucre appressed, in 2 or 3 series, subulate- 
linear, acute; rays 3 to 6; disk flowers 10 or 12; achenes slender, villous, with fine and 
soft capillary pappus. 
1. Chrysoma laricifolia (A. Gray) Greene, Erythea 3: 11. 1895. 
Aplopappus laricifolius A. Gray, Pl. Wright. 2: 80. 1853. 
Type Locauity: Mountains at Guadalupe Pass, New Mexico. 
Rance: Western Texas to southern Arizona. 
New Mexico: Burro Mountains; Bear Mountains; Redrock; Florida Mountains; 
Animas Mountains; Organ Mountains; Dona Ana Mountains. Dry, rocky hills and 
canyons, in the Lower and Upper Sonoran zones. 
This is one of the handsomest plants of the southwestern foothills. When in full 
flower it is a solid mass of golden yellow. It is especially effective because of its 
densely branched crown and the very numerous dark green leaves. 
22. OLIGONEURON Small. 
Coarse perennial with numerous basal and many broad, serrate or entire, thick cau- 
line leaves; heads comparatively large, compactly corymbose or cymose; involucral 
bracts broad, longitudinally striate; achenes turgid, 12 to 15-nerved, glabrous, 
1. Oligoneuron canescens Rydb. Bull. Torrey Club 31: 652. 1905. 
Type LocaLity: Buffalo, Wyoming. 
Ran@eE: Montana and Nebraska to Colorado and New Mexico. 
New Mexico: Beulah; Chama; Sierra Grande; Hermits Peak; Raton Mountains; 
Johnsons Mesa; Baldy; Sacramento Mountains. Mountains, in the Transition Zone. 
23. STENOTUS Nutt. 
A low scapose cespitose perennial from a thick woody caudex; leaves mostly basal, 
linear-oblanceolate; heads large, 12 to 15 mm. broad, radiate; bracts thin, oblong, 
obtuse; achenes oblong-turbinate, villous; pappus white, of numerous unequal sca- 
brous bristles. | 
1. Stenotus armerioides Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 335. 1841. 
Aplopappus armerioides A. Gray, Syn. Fl. 1°: 182. 1884. 
Type Locauity: ‘Toward the sources of the Platte, in the Rocky Mountain range, 
on shelving rocks.”’ 
Ran@eE: British America to Colorado and New Mexico. 
New Mexico: Fort Wingate; hills 10 miles north of Santa Fe. Dry hills and plains, 
in the Upper Sonoran Zone. 
