1907] Hall. Compositae of Southern California. 245 



TRIBE 11. MUTISIEAE. MUTISIA TRIBE. 

 101. PEREZIA Lag. 



Perennial branching herbs. Involucre imbricated; bracts 

 dry, chartaceous or coriaceous. Reeeptacle flat, usually naked. 

 Flowers never yellow. Style-branches flattened above, truncate. 

 Achenes elongated-oblong, terete, sometimes narrowed at apex but 

 not beaked. Pappus of many capillary scabrous bristles. 



1. P. microcephala (DC.) Gray, PL Wright, i. 127 (1852). 

 Acourtia microcephala DC., Prodr. vii. 66 (1838). 



Somewhat stout, commonly 1 m. or more high, leafy : herbage 

 scabrous-puberulent and minutely glandular : leaves thin, 1 to 2 

 dm. long by 3 to 8 cm. broad, oblong, mostly acute, sessile by a 

 broad or clasping base, finely and closely denticulate : heads num- 

 erous, in terminal cymose panicles, 10 to 15-flowered: involucre 



7 to 9 mm. high; bracts oblong, abruptly acuminate or mucro- 

 nate: corollas rose-color or whitish or pure white, bilabiate, the 

 outer lip broad and 3-toothed, inner 2-lobed : pappus white, soft. 



Rather common in the chaparral belt of the Upper Sonoran 

 Zone from Santa Rosa Island (Brandegee) and San Luis Obispo 

 Co. (Templeton, Alfred Carling) to western San Diego Co. 



102. TRIXIS P. Browne. 



Ours a low desert shrub with medium-sized heads and yellow 

 flowers. Involucre little if at all imbricated; the proper bracts 



8 to 12, equal and in a single series, or in two unequal series. 

 Receptacle mostly pilose. Style-branches flattened above, trun- 

 cate. Achenes slender, tapering to the summit or beaked, 5-cos- 

 tate. Pappus soft, copious. 



1. T. angustifolia latiuscula Gray, Syn. Fl. i. pt. 2, 410 



(1884). T. suffruticosa Wats., Bot. Calif, ii. 459 (1880). 



An erect bushy shrub about 6 dm. high, leafy up to the heads : 

 herbage minutely glandular-puberulent, perhaps sometimes glab- 

 rate, said to be strongly scented with the odor of wormwood: 

 leaves lanceolate, narrow at base, acute, entire or sparingly den- 

 ticulate, usually 2 to 4 cm. long by 8 to 12 mm. broad: heads 



