WOOTON AND*STANDLEY—FLORA OF NEW MEXICO. 671 
New Mexico: Tunitcha Mountains; Cedar Hill; Dulce; Chama; Sandia Moun- 
tains; Santa Fe and Las Vegas mountains; Johnsons Mesa; Middle Fork of the Gila; 
Kingston; Burro Mountains; Water Canyon; San Luis Mountains; Organ Mountains; 
White and Sacramento mountains. Open slopes and in thickets, chiefly in the 
Transition Zone. 
29. PETRADORIA Greene. 
Low tufted perennials with mostly basal narrow rigid sharp-pointed leaves and 
small heads of yellow flowers in corymbs; heads narrowly oblong, 5 to 8-flowered, 
with 1 to 3 short rays; bracts much imbricated, firm, broad, slightly carinate, with 
small green tips; achenes compressed, 5-nerved, with short rigid pappus. 
KEY TO THE SPECIES, 
Basal leaves linear-oblanceolate, with 3 or more nerves, long, usually 
more than half as long as the stems; plants usually 20 cm, high 
OF MOPC....-.-----.e eee eee eee 1. P. pumila. 
Leaves all linear, 1-nerved, short, less than half as long ¢ as the stems, 
more numerous; plants lower wee eee ee eee eee eee eee eee 2. P. graminea. 
1. Petradoria pumila (Torr. & Gray) Greene, Erythea 3: 13. 1895. 
Solidago pumila Torr. & Gray, Fl. N. Amer. 2: 210. 1840. 
Type Locauity: ‘‘In open situations, on shelving rocks toward the western declivity 
of the Rocky Mountains.” 
Rance: Wyoming and Nevada to Colorado and New Mexico. 
New Mexico: Abiquiu; Pecos River; Rio Zuni; Farmington; Carrizo Mountains. 
Dry hills and plains, in the Upper Sonoran Zone. 
2. Petradoria graminea Woot. & Standl. Contr. U. 8. Nat. Herb. 16: 183. 1913. 
Type Locatity: Northwestern New Mexico. Type collected by C. C. Marsh (mo. 
209). 
Rance: Northwestern New Mexico. 
New Mexico: Gallup; Tunitcha Mountains. Plains and low hills, in the Upper 
Sonoran Zone. . 
30. BACCHARIS L. 
Often viscid shrubs, rarely perennial herbs, with alternate, simple, entire or toothed 
leaves, the branches commonly striate or angled; heads usually small, whitish or 
yellowish, dicecious; involucre of small, much imbricated, mostly acute bracts; recep- 
tacle usually flat and naked; pappus of fertile flowers of numerous bristles in 1 or 
several series, often elongated in fruit. 
KEY TO THE SPECIES. 
Pappus scant, little if at all elongated in fruit, not exceeding the 
styles. 
Bracts with green midribs; leaves linear or- oblong, rather 
obtuse, l-nerved, 4 cm. long or less.........---------- 1. B. bigelovit. 
Bracts yellowish throughout; leaves elongated-lanceolate, 
acute, 3-nerved at the base, 4 to 10 cm. long..........- 2. B. glutinosa, 
Pappus abundant, much elongated in fruit and exceeding the 
styles. 
Pappus in several series; plants 50 cm. high or less, herbaceous 
to the base... 2. 2 2.2. 7. B. wrightit. 
Pappus in a single series; plants usually 1 meter high or more, 
shrubby. 
