(98) 



6. M. FiLiPES Gray. Ray-flowers short, in- 

 conspicuous; pappus 0; disc-flower solitary. 

 G. — Antioch. Spring. 



All the species covered by a resinous exu- 

 dation of strong, generally disagreeable odor. 

 Recommended by the old settlers in afi'ections 

 of the urinary organs. 



33. Hemizonia DO. Tar- weed. 



Necessaria. Superflua. Ray-flowers ligu- 

 late, dentate. Involucre 1-seriate, with con- 

 cave scales embracing the ray-akenes. Recep- 

 tacle flat, naked in the center, with a row of 

 palese between disc and ray or sometimes 

 throughout. Akenes of the ray convex exter- 

 nally, flat internally; pappus of the ray 0; 

 pappus of the disc scaly, aristate, plumose or 

 0. — 0. Yiscid, resinous herbs; flowers yellow, 

 white. 



1. H. LUZUL^EFOLIA DC. Only the ray- 

 akenes developed, these obovate, triangular; 

 terminal area depressed; rays 3-lobed, fre- 

 quently white. — 0. San Francisco. Summer. 



2. H. MACRADENIA DC Ray-flowcrs numer- 

 ous with short liguhe. Ray-akenes turgid, 

 gibbose, the gibbosity pushing the terminal 

 area to the inner angle so that the area appears 

 lateral; receptacle conical; leaves not pungent; 

 flowers always yellow. — 0. Tamalpais. Con- 

 tra Costa. Autumn. 



