1907] Hall. Compositae of Southern California. 179 



3. H. Wrightii, Hall, comb. nov. Hymenothrix Wrightii Gray. 

 PL Wright, ii. 97 (1853). 



Stems rigid, corymbosely branched, 2 to 10 dm. high, from a 

 biennial or perennial root: herbage somewhat hirsute below, 

 glandular or glabrous above, no woolly tomentum : leaves once 

 or twice ternately divided into linear or filiform divisions : in- 

 volucre (6 to 8 mm. high) of obovate-oblong and very obtuse pur- 

 ple-tinged bracts and a few smaller narrow accessory ones : rays 

 none: disk-flowers white or purplish, with very slender tube, 

 short throat, and limb 5-parted into widely spreading lobes : 

 style-tips flat, cuspidate : anthers exserted : achenes villous : pap- 

 pus-paleae lanceolate, the strong midrib continued as a scabrous 

 awn nearly equalling the corolla. 



Pine Valley, San Diego Co., Alderson, ace. to Parish; Stone- 

 wall Mine, Cuyamaca Mt., San Diego Co., Brandegee; southern 

 Arizona and Lower California. 



69. PALAFOXIA Lag. 



Ours a robust much branched herb of the Desert Area. Leaves 

 alternate, entire. Heads narrow, discoid, the flowers either all 

 alike or the outer corollas sometimes with very unequal lobes. 

 Involucre of linear nearly equal bracts. Achenes nearly as long 

 as the involucre, the slender pappus therefore much exserted. 



1. P. linearis (Cav.) Lag., Nov. Gen. et Spec. 26 (1816) ; 

 Hook., Bot. Mag. t. 2132 (1819). Ageratum lineare Cav., Ic. PL 

 iii. 3, t. 205 (1794). 



Flowering as an annual but becoming perennial and some- 

 what lignescent at base : herbage scabrous or hispid, the leaves 

 canescent: leaves linear or linear-lanceolate, 2 to 6 cm. long in- 

 cluding the petiole-like base, acute, 1-nerved: involucre about 

 15 mm. high; bracts linear, acute, lightly clasping the outer 

 achenes : corolla-lobes 5, subequal or in the outer flowers often 

 very unequal, one-half to one-fourth as long as the throat : pappus 

 of 4 or 5 linear acute paleae nearly as long as the achene, trav- 

 ersed by a strong midrib and bordered with a membranous mar- 

 gin; in addition sometimes 2 to 4 shorter obtuse ones, or the 

 paleae of the outer flowers sometimes all much reduced. 



