GRINDELIA HAPLOESTHES 275 



GRINDELIA Willdenow 1807 GUM WEED 

 (Named for Grindel, a Russian botanist) 



PL 38, fig. 8. 



Heads with yellow pistillate ray-flowers or none, disk-flowers yellow, 

 perfect or staminate, achenes oblong-ovoid, 4-5-ribbed, pappus of 2-8 awns 

 or bristles, soon falling; receptacle flat or convex, without chaff, involucre 

 hemispheric, the bracts imbricated in several-many rows, often spreading 

 and reflexed ; heads solitary at the ends of branches ; leaves alternate, usu- 

 ally spiny-toothed, often clasping; perennial, often woody at base. 



1. Heads hemispheric; involucral bracts narrow, 



the reflexed tips awl-shaped ; rays often absent G. squarrosa 



2. Heads broad and flat ; involucral scales broad, the 



reflexed tips flat G. texana, 



GUTIERREZ: A Lagasca 1816 GUTIERREZ: A 

 (Named for Gutierrez, a Spanish noble) 



PL 38, fig. 6. 



Heads with 1-10 yellow, pistillate ray-flowers, disk flowers 1-10, yellow, 

 perfect or some staminate, achenes ovoid, rounded, ribbed or 5-angled, pap- 

 pus of several scales ; receptacle flat to conic, without chaff, involucre ovoid 

 to oblong, bracts somewhat papery, imbricated in a few rows; heads in 

 corymbose panicles; leaves alternate, linear, entire; perennial, often woody 

 at base. 

 Stems bushy-branched, 6-25 in. high; leaves linear, 



1-4 cm. long; heads 3-4 mm. high; rays 1-10 G.sarothrae 



GYMNOLOMIA H. B. K. 1820 GYMNOLOMIA 

 (Gr. gymnos, naked, loma, fringe, from the absent pappus) 



PL 39, fig. 5. 



Heads with yellow pistillate ray-flowers, disk-flowers yellow or brown, 

 perfect, achenes 4-angled, pappus a toothed crown or none, receptacle conic, 

 with chaff, involucre hemispheric to bell-shaped, bracts in 2-3 rows ; heads 

 solitary on the branches ; leaves alternate or opposite, simple, entire or 

 toothed ; perennial. 

 Stems 1-5 ft. high; leaves linear to lanceolate; rays 



10-15 G. multiflora 



HAPLOESTHES Gray 1859 



(Gr. haploos, simple, esthes, garment, from the few bracts of the involucre) 



Heads with yellow pistillate ray-flowers, disk-flowers perfect, yellow, 



achenes linear, rounded, ribbed, pappus of bristles ; receptacle flat, without 



chaff, involucre bell-shaped, of 4-5 nearly equal fleshy bracts, the outer 



