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°-2i° higb, hairy : 

 heads few, V'-'i" 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, especiallj' in the 

 southern part. July-September. 



3. L. punctata (Hook.) Kuntze. 6'-3(/ 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 ( INIichx. ) 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. Ray flow- 

 ers only perfecting seeds. Achenes hairy. 



1. A. dracunculoides (DC.) Nutt. Yellow Weed. Q'-2l° 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. r-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 V)ristles. 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 

 Greenwoo<l, 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, lieceptacle pitted. Ray flowers pistillate. Disk 

 flowers perfect. 



