94 University of California Publications in Botany. [ VOL - 3 



shorter than the style and the pappus, white: pappus simple, 

 sordid and becoming ferruginous. 



A wayside weed recently introduced from the tropics: San 

 Diego, Jul. 1, 1895, Miss Stokes : Redlands, Sept. 1905, Reed, no. 

 806, and Greata; Pasadena, Grant, Grinnell, etc. 14 In all these 

 collections, except the first, the pappus is dull white, but other- 

 wise they agree in every detail with typical E. limfolius. It is 

 probable that the pappus colors with age. 



25. CONYZA. 



Herbs, or rarely shrubs, with alternate leaves and rather small 

 heads mostly in cymes or racemes. Bracts of the involucre in 

 two or more rows, often with membranaceous margins. Recep- 

 tacle naked. Pistillate flowers in two or more outer circles; 

 their corollas slender, dull white or yellowish, much shorter than 

 the style, with notched or obscurely ligulate border. Perfect 

 flowers central, mostly fertile. Achenes small, compressed. 

 Pappus usually a single series of bristles. 



1. C. Coulter! Gray, Proc. Am. Acad. vii. 355 (1868). 



Two to 10 dm. high: stems erect from an annual root, her- 

 baceous and leafy throughout, branching above into an oblong 

 panicle of numerous heads : herbage viscidly pubescent or short- 

 hirsute with many-jointed hairs : leaves thin, the lower oblanceo- 

 late in outline (often 1 dm. long), the main cauline varying to 

 narrowly oblong and closely sessile by a broad base (2 to 5 cm. 

 long), all thin and coarsely toothed : involucre 3 mm. (whole head 

 about 5 mm.) high; bracts linear-acuminate, the inner ones 

 scarious, the outer obscurely white-margined: pistillate flowers 

 numerous, their nearly white corollas only one-half as long as 

 the style and with obscurely toothed summit: perfect flowers 5 

 to 8 : achenes elliptic-oblong, minutely pubescent : pappus dull 

 white, soft, much exceeding the involucre. 



Lower and Upper Sonoran zones, in moist soil at low altitudes, 

 from the San Joaquin Valley and Southern California to Mexico ; 

 rare in our district: Santa Cruz Island, ace. to Greene; 15 Santa 



14 Now reported also from Eiverside and Old San Bernardino by Parish, 

 Muhlenbergia iii. 61 (1907). 



is Bull. Calif. Acad. ii. 401 (1887). 



