394 Astereae 



4. GUTIERBEZIA Lag. 



Herbaceous or suffrutescent, freely branching, some- 

 what resiniferous, nearly glabrous plants, with alternate 

 linear entire leaves, and numerous small heads corym- 

 bosely arranged at the ends of the branches. Involucral 

 bracts coriaceous, the outer successively shorter. Ray- 

 and disk-flowers yellow. Achenes angled or striate, 

 mostly silky. Pappus paleaceous. 



1. G. divergens Greene. Suffrutescent, 4-7 dm. high, gla- 

 brous or merely granular-scaberulous, the panicled branches 

 nearly destitute of foliage at flowering time; involucres 6 mm. 

 high, obovate-turbinate, their obovate obtuse bracts well-imbri- 

 cated and with blunt green tips; disk-flowers 5-7; rays about 5; 

 paleae of the pappus 9-12, very unequal, narrow and acute. 



Common on the interior plains and foothills, especially common on the 

 fans at the base of the mountains. July-August. 



5. PENTACHAETA Nutt. 



Small slender nearly glabrous annuals, with alternate 

 linear entire leaves, and mostly small heads solitary or 

 somewhat clustered at the ends of more or less naked 

 branches. Involucre hemispheric or campanulate, its 

 bracts in 2 series, scarious-margined, appressed, mucro- 

 nate. Ray-flowers white, yellow or wanting. Disk-flowers 

 yellow, very slender. Style-appendages filiform-subulate, 

 hispid. Achenes pubescent. Pappus of 3-5 slender 

 bristles. 



1. P. aurea Nutt. Diffusely branching, 1-3 dm. high, some- 

 what villous-pubescent ; heads about 10-15 mm. broad, many- 

 flowered ; flowers all yellow ; rays obtuse, 20 or more ; involucral 

 bracts broadly lanceolate, setaceously acuminate, with green 

 middle portion and scarious margins ; achenes somewhat villous- 

 pubescent ; pappus bristles 5-8. 



Arroyo Seco, Davidson. Frequent in the Santa Ana Mountains and com- 

 mon throughout the coast slope of San Diego County. 



