268 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. nana 



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. acuminata 



(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- 



