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. 1°-2J° high, hairy : 

 heads few, i"-b" 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. e'-SO' 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 ShefSeld. 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'-2P 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. Gr. squarrosa (Pursh) Dunal. GUM Plant. 1°-3° high, glabrous, 

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

 adveutized 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 Yl"-lSi" 

 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 beads of yellow flowers. Involucre imbri- 

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

 flowers perfect. 



