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 1 . E. coulteri. 



Leaves twice pinnatifid; stems sparingly glandular, not densely 



leafy 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 coulteri 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; Alaraogordo; Carlsbad; Dayton; Guadalupe 

 Mountains. Plains and hills, in the Lower and Upper Sonoran zones. 



2. Eschenbachia tenuisecta (A. Gray) Woot. & Standi. Contr. U. S. Nat. Herb. 16: 



1S6. 1913. 

 Conyza coulteri tenuisecta A. Gray, Syn. Fl. I 2 : 221. 1884. 

 Type locality: 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. canadt n$e. 



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. 180S. 



IIorseweed. 

 Erigeron canadensis L. Sp. PI. 863. 1753. 

 Type locality: "Canada, Virginia." 



Range: Throughout temperate North America, a common weed in cultivated fields 

 and waste ground; also in Asia. 

 \ i sw Mexico: Common throughout the State. 



2. LeptUon integiifolium Woot. & Standi. Contr. U. S. .Nat. Serb. 16: 183. 1913. 

 Type locality: Weal Fork of the Gila, Mogollon Mountains, New Mexico. Type 



collected l>y Metcalfe (no. 610). 



Ranch: Mountains of New Mexico. 



Nku Mexico: Wert Pork of the Gila; Mineral Creek; White Mountains; Bart Las 

 Vegas. Transil ion Zone. 

 52570°— II 43 



