Genus 39. 



THISTLE FAMILY 



1. Baccharis salicina T. & G. Willow Bac- 

 charis. Fig. 4384. 



Baccharis salicina T. & G. Fl. N. A. 2 : 258. 1841. 



A glabrous glutinous much-branched shrub, 3-6 

 high, the branches ascending. Leaves firm, oblong- 

 lanceolate or somewhat oblanceolate, more or less 

 conspicuously 3-nerved, mostly obtuse at the^ apex, 

 narrowed into a cuneate subsessile base, l'-li' long, 

 2 "-6" wide, sparingly repand-dentate, or entire ; 

 heads in peduncled clusters of 1-7, the involucre of 

 both sterile and fertile ones campanulate, 2V-3" 

 high, its bracts ovate or ovate-lanceolate, acute or 

 subacute; pappus usually but a single series of nearly 

 white capillary bristles. 



Western Kansas and eastern Colorado to Texas and 

 New Mexico. May-July. 



2. Baccharis halimifolia L. Groundsel-tree or 

 -bush. Pencil-tree. Fig. 4385. 



Baccharis halimifolia L. Sp. PI. 860. 1753. 



A branching glabrous shrub, 3-io high, the branch- 

 lets angled, sometimes minutely scurfy. Leaves thick, 

 those of the stem and larger branches obovate or del- 

 toid-obovate, obtuse, petioled, coarsely angular-dentate, 

 i'-3' long, -2' wide, those of the branchlets oblanceo- 

 late, short-petioled or sessile, entire, or few-toothed 

 toward the apex ; heads in peduncled clusters of 1-5, 

 those of the sterile plant nearly globose when young, 

 the bracts of the involucre oblong-ovate, obtuse, gluti- 

 nous, appressed, the inner ones of the pistillate heads 

 lanceolate, acute or acutish ; fertile pappus bright white, 

 3"-4" long, of 1-2 series of capillary bristles, much ex- 

 ceeding the involucre. 



Along salt marshes and tidal rivers, extending beyond 

 saline influence, Massachusetts to Florida and Texas. Ba- 

 hamas ; Cuba. The white pappus is very conspicuous in 

 autumn. Cotton-seed tree. Ploughman's-spikenard. Sept- 

 Nov. 



Baccharis glomeruliflora Pers., which has larger heads 

 glomerate in the axils of the upper leaves, is doubtfully re- 

 ported from southern Virginia, but occurs along the coast 

 from North Carolinato Florida, and in Bermuda. 



3. Baccharis neglecta Britton. Linear- 

 leaved Baccharis. Fig. 4386. 



Baccharis neglecta Britton, in Britt. & Brown, 111. FI. 

 3: 394. 1898. 



A much-branched, glabrous or slightly glutinous 

 shrub, 3 high or more, the branches paniculate, 

 slender, ascending. Leaves narrowly linear to 

 linear-lanceolate, faintly 3-nerved, acute, or the 

 lower subobtuse at the apex, gradually attenuate 

 into a nearly sessile base, 1-3 long, i"-3" wide, 

 entire, or remotely dentate or denticulate, green 

 in drying ; heads in short-peduncled clusters ; in- 

 volucre of both kinds of heads campanulate, 2" 

 high, its outer bracts ovate, acute or somewhat 

 obtuse, the inner lanceolate, acuminate ; pappus 

 of the fertile flowers a single series of capillary 

 dull-white bristles. 



Nebraska to Texas and North Mexico. July-Sept. 



