2 68 ASTER FAMILY 



in 1 row with shorter basal ones ; heads in panicles or corymbs ; leaves alter- 

 nate or basal, entire to pinnatifid; annual or perennial. 



1. Stems none or 4-10 in. high; heads very many, 



the involucre 6-8 mm. long, 2-3 mm. wide; 

 achenes broadened at the tip into a disk 



a. Stemless or nearly so, the tufts from creeping 



rootstocks C. ndna 



b. Stems 4-10 in. high from a tap root C. elegans 



2. Stems 1-3 ft. high; heads few-many; achenes not 



broadened into a disk 



a. Stems and leaves smooth or glaucous, occa- 



sionally with coarse hairs, not finely gray- 

 hairy ; leaves mostly entire or with coarse 

 teeth, rarely deeply pinnatifid 



( 1 ) Involucres and peduncles smooth C. glauca 



(2) Involucres and peduncles coarsely hairy, 



the latter often woolly C. runcindta 



b. Stems and leaves gray-hairy to woolly ; leaves 



usually deeply pinnatifid 



(1) Involucres narrow, 1 cm. or less long, 2-3 



mm. wide, smooth, except for the wool- 

 ly-edged bracts at the base; inner bracts 

 5-8 ; flowers 5-8 C. acumindta 



(2) Involucres 1-2 cm. long, 4-6 mm. wide, 



gray-hairy or woolly; inner bracts 9- 



24 ; flowers 10-30 C. occidentdlis 



DICORIA Torrey and Gray 1848 

 (Gr. di-, twice, koris, bug, from the two achenes) 



Heads without rays, with 1-2 pistillate flowers without corolla and 6- 

 12 staminate ones, achenes oblong, margined with teeth, pappus small of 

 several little scales ; receptacle flat, chaff of 2 narrow scales, involucre of 

 5 leafy bracts ; heads in a sparse panicle, some all staminate ; leaves alternate, 

 at least above, usually entire ; annual. 

 Leaves lance-oblong to spatulate, 2-3 cm. long; pistil- 

 late flowers solitary in the head D. Brandegei 



DYSODIA Cavanilles 1801 DYSODIA 



(Gr. dysodia, ill-smelling) 

 (Hymenatherum Cassini; Lowellia Gray) 



PI. 41, fig. 6. 



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

 achenes 3-5-angled, pappus of 6-10 scales, toothed or fringed with hair- 



