WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 673 
31. ESCHENBACHIA Moench. 
Coarse annuals with branched, very leafy stems, small, narrow, toothed, pinnatifid 
or entire, sessile, alternate leaves, and very numerous heads in leafy panicles; heads 
small, campanulate, many-flowered, the flowers whitish, the corollas of the pistillate 
flowers reduced to a short-filiform tube; rays wanting; bracts narrow, in 1 to 3 series; 
achenes small, compressed; pappus a single series of soft capillary bristles. 
KEY TO THE SPECIES. 
Leaves merely serrate or laciniate; stems very glandular, densely 
leafy... 2 elec eee eee eee eee eee cee eee ee eee eens 1. E. coulteri. 
Leaves twice pinnatifid; stems sparingly glandular, not densely 
1 a wee eee eens eee cece eee eeee 2, E. tenuisecta. 
1. Eschenbachia coulteri (A. Gray) Rydb. Bull. Torrey Club 33: 154. 1906. 
Conyza coulteri A. Gray, Proc. Amer. Acad. 7: 355. 1868. 
Conyzella coultert Greene, Fl. Franc. 386. 1897. 
TYPE LOCALITY: Mexico. 
RanGE: Colorado and western Texas to California and southward. 
New Mexico: Garfield; Cienaga Ranch; Plaza Larga; Mangas Springs; Organ Moun- 
tains; south of Tularosa; south of Roswell; Alamogordo; Carlsbad; Dayton; Guadalupe 
Mountains. Plains and hills, in the Lower and Upper Sonoran zones. 
2. Eschenbachia tenuisecta (A. Gray) Woot. & Standl. Contr. U.S. Nat. Herb. 16: 
186. 1913. 
Conyza coulteri tenuisecta A. Gray, Syn. Fl. 17: 221. 1884, 
Type Locauiry: Near Fort Huachuca, southern Arizona, 
RanGE: Southern New Mexico and Arizona, 
New Mexico: Bear Mountains; Mineral Creek; Fort Bayard; Organ Mountains. 
Canyons, in the Upper Sonoran Zone. 
32. LEPTILON Raf. 
Coarse annuals or biennials with simple or branched stems, alternate entire or 
toothed leaves, and numerous paniculate or racemose, small heads of whitish flowers; 
involucre cylindric or campanulate, of numerous small narrow green bracts; rays very 
short, scarcely if at all surpassing the pappus, in several rows; pappus a single series 
of capillary bristles. 
KEY TO THE SPECIES. 
Plants usually a meter high, often taller; leaves mostly linear, 
ciliate; heads less than 5 mm. wide, numerous..........--- 1. L. canadense. 
Plants 50 cm. high or less; leaves oblong to lanceolate, not ciliate; 
heads 6 or 7 mm. wide, few..................------------ 2. L. integrifolium. 
1. Leptilon canadense (L.) Britton in Britt. & Brown, Illustr. Fl. 3:391. 1898. 
HorsEWEED. 
Erigeron canadensis L. Sp. Pl. 863. 1753. 
Typrr Locauity: ‘‘Canada, Virginia.”’ 
RanaE: Throughout temperate North America, a common weed in cultivated fields 
and waste ground; also in Asia. 
New Mexico: Common throughout the State. 
2. Leptilon integrifolium Woot. & Standl. Contr. U. 8. Nat. Herb. 16: 183. 1913. 
TYPE LOCALITY: West Fork of the Gila, Mogollon Mountains, New Mexico. Type 
collected by Metcalfe (no. 610). 
Rance: Mountains of New Mexico. 
New Mexico: West Fork of the Gila; Mineral Creek; White Mountains; East Las 
Vegas. Transition Zone. 
52576°—15——43 
