332 COMPOSITE. Conyza. 



hirsute, thickly beset with linear entire leaves, or those at the base broader and cut- 

 lobed : leafy panicle generally long and narrow : pappus simple. 



Waste and cultivated grounds, everywhere having the aspect of an introduced weed, common 

 almost all over the world. 



24. CONYZA, Linn. 



Heads many -flowered, heterogauious, but not radiate ; the pistillate flowers in 

 many series and more numerous than the fertile ones, with only a filiform truncate 

 corolla shorter than the style ; the few central flowers tubular and perfect, or some 

 of them infertile. Involucre of narrow numerous scales. Receptacle flat or convex, 

 naked. Style-appendages short. Akenes small, flattened, usually nerved only on 

 the margins. Pappus as in Erigeron, in ours of simple scanty capillary bristles. 

 Mostly tropical or subtropical weeds, with alternate toothed or lobed leaves, and 

 small corymbose or panicled heads of whitish or yellowish flowers. 



1 . C. Coulteri, Gray. Annual (?), somewhat viscidly pubescent, one or two feet 

 high, very leafy to the top : leaves closely sessile, linear-oblong or the lower spatu- 

 late, coarsely toothed or incisely pinnatifid, about an inch long : panicle narrow, 

 virgate : heads very numerous, small, barely 2 lines long : involucre hairy : central 

 perfect flowers 5 to 7. Proc. Am. Acad. vii. 355. C. subdecurrens, Gray, PI. 

 Fendl. &c., not of DC. Erigeron discoidea, Kellogg in Proc. Calif. Acad. v. 55. 



S. E. borders of the State (Coulter, Cooper) ; on the San Joaquin (Kellogg) ; and through Ari- 

 zona to Colorado and Texas. A homely weed. 



25. BACCHARIS, Linn. 



Heads inany-flowered, homogamous, dioecious ; in the sterile plant the flowers 

 seemingly perfect as to style &c., but with abortive ovary ; in the fertile pistillate 

 only. Involucre of dry imbricated scales, destitute of herbaceous tips, the exterior 

 successively shorter. Eeceptacle commonly flat and naked. Corolla of the fertile 

 flowers small and filiform, truncate, wholly destitute of ligule, shorter than the 

 style : in the sterile flowers tubular with a somewhat expanded 5-cleft limb : the 

 style usually 2-cleft at summit, sometimes undivided. Akenes small, several-ribbed. 

 Pappus in the fertile flowers of copious mostly soft and fine capillary bristles ; in 

 the sterile commonly less copious or less elongated, often tortuous and more den- 

 ticulate. Shrubby or sometimes herbaceous plants, ours all glabrous, often gluti- 

 nous, with alternate leaves and small mostly clustered heads of white or yellowish 

 inconspicuous flowers. 



A veiy large genus in South America, a few reaching the United States throughout its southern 

 borders, and extending northward along either coast. 



* Leaves broad, short and obtuse, commonly few-toothed : heads paniculate-glomerate 

 on the very numerous branches : pappus in the fertile flowers at length much exceeding 

 the involucre. 



1. B. pilularis, DC. Shrub J to 4 feet high, glutinous : leaves sessile, obovate 

 or cuneiform, about an inch long, coarsely or sinuately few-toothed, or occasionally 

 entire : heads 2 or 3 or more in a cluster from the axils of the upper leaves, globu- 

 lar, 2 or 3 lines long, the fertile pappus becoming 4 or 5 lines long. B. pilularis 

 & B. consanguinea, DC. 



Common in sandy soil along the whole length of the coast, and reaching Oregon ; flowering in 

 autumn. De Candolle's specific name may relate to the size and form of the flowering heads, or to 

 small globular excrescences, probably galls, which often occur on some branchlets. 



