COMPOSITE. (COMPOSITE FAMILY.) 175 



inch or two long : involucre 1 or 2 lines high, hirsute with rather soft spread- 

 ing hairs, considerably shorter than the soft pappus : flowers whitish. Proc. 

 Am. Acad. vii. 355. W. Texas and Colorado to Arizona and California. 



16. BACCHARIS, L. 



More or less shrubby : with alternate simple leaves, and the branches striate, 

 bearing small heads of white or yellowish flowers. 



1. B. Wrightii, Gray. Herbaceous from a woody base, very smooth and 

 glabrous, a foot or two high, diffusely branching, sparsely leaved : slender 

 branches terminated by solitary heads : leaves linear, small ; uppermost linear- 

 subulate: involucre campanulate, 4 or 5 lines high; Its bracts lanceolate, gradu- 

 ally acuminate, conspicuously scarious-margined, with a green back : pappus 

 very copious and pluriserial, soft, elongating in fruit, fulvous or purplish, four 

 times the length of the scabrous-glandular 8 to 10-nerved akene. PL Wright, 

 i. 101. W. Texas to S. Colorado and Arizona. 



2. B. salicina, Torr. & Gray. Branching shrubs, 3 to 12 feet high, gla- 

 brous or nearly so, usually viscous, with a resinous exudation: leaves mostly 

 subsessile,//w/z oblong to linear-lanceolate, sparingly toothed, rarely entire : heads 

 or glomerules pedunculate : involucre campanulate, about 3 lines high ; its bracts 

 ovate and acutish : pappus more or less copious, but mostly unisenal, conspicu- 

 ously elongating in fruit, white, soft and flaccid: akenes 10-nerved. Fl. ii. 258. 

 Colorado to Texas. 



3. B. glutinosa, Pers. Stems herbaceous above but woody toward the 

 base, 3 to 10 feet high: branches somewhat striate-angled : leaves elongated-lan- 

 ceolate, serrate with few or several scattered teeth on each side, more or less 

 distinctly 3-uerved from near the base, 3 or 4 and the larger 5 or 6 inches 

 long : heads mostlv 3 lines long, numerous and corymbosely cymose at the summit 

 of comparatively simple stems or branches : involucre stramineous : pappus not 

 very copious, nor flaccid, and elongated hardly at all in fruit: akene 5-nerved. 

 From S. California to S. Colorado and Texas. 



17. EVAX, Gartn. 



Dwarf and depressed annuals, floccose-woolly. In ours the heads are small 

 and aggregated in terminal foliose-involucrate glomerules. 



1. E. prolifera, Nutt. Rather stout: stem often a span high, simple 

 and erect, or with ascending branches from the base, bearing numerous small 

 spatulate leaves and a capituliform glomerule, half an inch in diameter; whence 

 proceed 1 to 3 nearly leafless branches similarly terminated, sometimes again 

 proliferous : fructiferous bracts scarious, oval or oblong, mainly naked ; those 

 embracing staminate flowers more herbaceous and woolly-tipped, of firmer 

 or more herbaceous texture : staminate flowers each on a filiform stipe repre- 

 senting an abortive ovary. Diaperia prolifera, Nutt. Dry ground, Colorado 

 to Dakota and Texas. 



18. ANTENNA HI A, Gartn. EVEBLASTING. 



Mostly low, canescently and often floccosely woolly herbs, with whitish or 

 purplish flowers : bracts of the involucre pearly white, rose-color, or brownish, 

 never yellow. 



