192 COMPOSITAE 



Heads 3-6-flowered. 



Tips of involucral bracts erect 3. L. punctata. 



Tips of involucral bracts spreading. 4. L. pycnostachya. 



1. L. squarrosa intermedia (Lindl.) Porter. l-2 high, hairy: 

 heads few, 4 // -5 // wide : tips of involucral bracts spreading Locally 

 common on dry hills near Lee's Summit and Dodson, July-September. 



2. L. scariosa (L. ) Hill. 2-5 high : leaves oblong-ovate to linear- 

 lanceolate : heads numerous : tips of involucral bracts not spreading, 

 purple-margined. Not uncommon in dry grounds, especially in the 

 southern part. July-September. 



3. L. punctata ( Hook. ) Kuntze. 6 / -30 / high : heads numerous : invo- 

 lucral bracts cuspidate or acuminate : pappus very plumose. Native west 

 of Lee's Summit in rocky barrens ; found as a waif near Sheffield. July- 

 September. 



4. L. pycnostachya (Michx.) Kuntze. 2-5 high : heads numerous : 

 involucral bracts acute : pappus merely barbellate. Frequent on prai- 

 ries, especially in the southern part. July-September. 



6. AMPHIACHYRIS DC. 



Glutinous annuals with alternate linear leaves, and numerous heads of 

 small yellow flowers. Pappus of ray flowers nearly obsolete. Eay flow- 

 ers only perfecting seeds. Achenes hairy. 



1. A. dracunculoides (DC.) Nutt. YELLOW WEED. 6'-2% high, 

 much branched. Abundant in dry soil throughout the southern part. 

 July-October. 



7. GRINDELIA Willd. 



Leaves sessile, alternate, spinulosely dentate. Involucral bracts imbri- 

 cated, with spreading tips. Receptacle naked. 



1. G-. squarrosa (Pursh) Dunal. GUM PLANT. l-3 high, glabrous, 

 glutinous : leaves oblong-spatulate : achenes not toothed. Occasionally 

 adventized along railroads at Kansas City. August-September. 



Var. nuda (Wood) A. Gray. Rays wanting. With the type. 



8. PRIONOPSIS Nutt. 



Differs from Grindelia chiefly in the pappus being composed of unequal 

 deciduous bristles. Mature achenes glabrous. 



1. P. ciliata Nutt. 2-4 high : leaves ovate, obtuse, spinulosely ser- 

 rate : involucral bracts glabrous, slightly spreading : heads 12 // -15 // 

 broad. Adventized along railroads at Kansas City ; also occurs near 

 Greenwood, where it is possibly native. July-September. 



9. SOLIDAGO L. GOLDEN ROD. 



Perennial herbs with small heads of yellow flowers. Involucre imbri- 

 cated in several series. Receptacle pitted. Ray flowers pistillate. Disk 

 flowers perfect. 



