688 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Stems with few erect branches, green; 
heads less than 15 mm. broad; 
leaves with numerous salient teeth.10. M. centaureoides, 
Stems with numerous, mostly spreading 
branches; heads more than 15 mm. 
broad; leaves with few, never 
salient teeth.................. -----ll. M., bigelovii. 
Plants glandular only on the bracts, or also spar- 
ingly on the peduncles, then only finely 
glandular. 
Leaves linear, very acute, entire............. 12. M. angustifolia, 
Leaves oblong to obovate, toothed, mostly 
obtuse. 
Basal leaves rounded-spatulate, the cau- 
line ones obovate, tapering to the 
base...........22.2..-.2222+2----..13. M. amplifolia. 
Basal leaves oblanceolate, acute, the 
cauline ones oblong to elliptic or 
lanceolate, not noticeably tapering 
to the base...........22...... .-...14. M. aquifolia. 
1. Machaeranthera tanacetifolia (H. B. K.) Nees, Gen. Sp. Aster. 224. 1832. 
Aster tanacetifolius H. B. K. Nov. Gen. & Sp. 4: 95. 1820. 
Dieteria coronoprfolia Nutt. Trans. Amer. Phil. Soc. n. ser. 7: 302. 1841. 
Machaeranthera coronopifolia A. Nels. Bot. Gaz. 87: 268. 1904. 
TYPE LocALITY: Mexico. 
Rance: Wyoming and Nebraska to Arizona and western Texas and southward. 
New Mexico: Throughout the State at lower altitudes. Sandy soil, in the Lower 
and Upper Sonoran zones, 
2. Machaeranthera tagetina Greene, Pittonia 4: 71. 1899. 
Machaeranthera tanacetifolia humilis A. Gray, Pl. Wright. 2:74. 1853. 
Machaeranthera humilis Standley, Muhlenbergia 5: 48. 1909. 
TYPE Locality: Arizona. 
Rance: Southwestern New Mexico and southern Arizona. 
New Mexico: Near Ojo de Gavilan (Wright 1151). Lower Sonoran Zone. 
3. Machaeranthera pygmaea (A. Gray) Woot. & Standl. Contr. U. 8. Nat. Herb. 
16: 189. 1913. 
Macheranthera tanacetifolia pygmaea A. Gray, Pl. Wright. 2: 74. 1853. 
Aster tanacetifolius pygmaeus A. Gray, Syn. F1. 17: 206. 1884. 
Tyre Locauity: ‘“‘Dry, stony hills, valley of the Salado, Chihuahua, and near 
El Paso.’”’ 
RanaGeE: Western Texas to southern Arizona and northern Mexico. 
New Mexico: A single specimen seen, without definite locality. 
4. Machaeranthera parviflora A. Gray, Pl. Wright. 1: 90. 1852. 
Aster parviflorus A. Gray in Brewer & Wats. Bot. Calif. 1: 322. 1876. 
Type Locauity: Along the Rio Grande, western Texas. 
Rance: Western Texas to southern Arizona. 
New Mexico: Farmington; Cedar Hill; Albuquerque; Mesilla Valley; White 
Sands; Alamogosdo. Sandy soil of plains, in the Lower and Upper Sonoran zones. 
5. Machaeranthera cichoriacea Greene, Leaflets 1: 148. 1905. 
TYPE Locality: Canyon of Deer Run, southern Colorado. 
Rance: Southern Colorado and northern New Mexico. 
New Mexico: Zuni; Shiprock; Carrizo Mountains; Cedar Hill; Farmington; Chama, 
Dry plains, in the Upper Sonoran Zone. 
