Hall. Compositae of Southern California. 93 



hispid pubescence: leaves linear, 1 to 2 cm. long, or the lower 

 somewhat longer and linear-spatulate, the uppermost reduced: 

 heads solitary, terminating slender peduncles: rays numerous, 

 filiform, 6 mm. long, violet or purplish (or white?) : inner pappus 

 of scanty slender bristles, the outer of much shorter subulate 

 squamellae. 



Lower California, Brandegee; Laguna, San Diego Co., Cleve- 

 land; San Bernardino Mts., where common ; Chuckawalla Bench, 

 Colorado Desert, Hall & Great a, no. 5881; near Palm Springs, 

 Oilman; Swartout Canon, San Antonio Mts. ; north to Washing- 

 ton and east to Nebraska. 



13. E. Canadensis L., Sp. PL 863 (1753). Leptilon Cana- 

 dense Britton, Illus. Fl. iii. 391 (1898). HORSEWEED. 



Stem simple, erect, 6 to 25 dm. high: herbage hispid with 

 scattered hairs or nearly glabrous: leaves linear to lanceolate, 

 the lowest spatulate or narrowed to a petiole, 5 to 7 or 8 cm. 

 long, mostly entire but the lower often acutely toothed or lobed : 

 heads small, very numerous in a sometimes dense terminal 

 panicle: involucre 4 mm. high, either perfectly glabrous or the 

 outer bracts sparsely pubescent : ray-flowers numerous, their lig- 

 ules white, shorter than or scarcely exceeding the pappus : pappus 

 simple. 



An indigenous weed, very common in waste places and cul- 

 tivated fields, flowering in late summer and autumn. Widely 

 distributed in the Old World, where it has become naturalized, 

 and in South America. With us the stems often grow to a height 

 of 25 dm. and become 1 cm. in diameter at the base in a single 

 season and much larger specimens are to be expected from the 

 irrigated portions of the Desert Area. The root is rarely bien- 

 nial. 



14. E. linifolius Willd., Spec. iii. 1955 (1810). 



Rather strict, 2 to 7 dm. high from an annual or biennial root : 

 herbage somewhat hispid, also scabrous with a minute appressed 

 pubescence : leaves narrowly spatulate to linear, 3 to 10 cm. long 

 (the upper gradually shorter), all but the lower entire: heads 

 rather few, in a loose panicle: involucre 4 or 5 mm. high; its 

 bracts linear-subulate, all copiously pubescent : ligules very small, 



