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. "Wriglltii, 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 pluriserlal, soft, elongating in fruit, fulvous or purplish, four 

 times the length of the scabrous-glandular 8 to 10-nerved akene. PI. 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,//wrt oblong to linear-lanceolate, sparingly toothed, rarely entire : heads 

 or glomendes 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: akeues 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-nerved from near the base, 3 or 4 and the larger 5 or 6 inches 

 long : heads mostly 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, Gaertn. 



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

 and aggregated in terminal foliose-involu crate glomerules. 



1. E. prolifera, Nutt. Rather stout: stem often a span hi<;h, 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. ANTENNAE- 1 A, Gajrtn. EVERLASTING. 



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. 



