208 



Descriptive Flora 



Page 



(2) Flowers small, leaves 



not hairy Helenium— 237-8 



(b) Rays not drooping, 

 (m) Leaf -stalk with leaf- 



like expansion at base Ximenesia — 232 



(n) Leaf-stalks not append- 

 aged at base. 



(1) Rays 4—5, stems 



coarse Lindhelmera — 227 



(2) Rays usually 8, 



leaves milky- veined Amblyolepis — 238 



(3) Rays varying from 5 

 —25. 



o. Heads usually less 



than % " across . . . Gutierrezia or 

 p. Heads usually over Gymnosperma — 217 

 %" across. 

 (1) Leaves gland- 



dotted Tetraneuris-— 237 



(2) Leaves not gland- 

 dotted. 



(a) Leaves strong- 

 scented . Heterotheca — 218 



(b) Leaves not 



strong-scented Chrysopsis — 219 



(n) Ray-flowers none. 



1. Leaves linear, entire Kuhnia — 216 



2. Leaves broader than linear, 



entire or toothed Coleosanthus — 216 



2. Blades not entire. 



r. Bracts of involucre 4, large Tetragonotheca — 228 



s. Bracts more than 4. 



(a) Disk columnar, rays droop- 

 ing Ratibida— 229 



(b) Disk not columnar, rays 

 not drooping. 



(x) Stems smooth or nearly 

 so. 



(1) Leaves rigid, buds and 



involucre resinous Grindelia — 218 



(2) Buds and involucre not 



resinous. 



