COMPOSITAE 205 



2. H. tenuifolium Nutt. Annual, nearly glabrous, l°-2° high : heads 

 about V broad. — Occasionally occurs as a waif along railroads, SheflSeld, 

 Leeds, Adams. August-October. 



35. GAILLARDIA Foug. 



Leaves alternate. Heads long-peduncled. Involucral bracts imbricated 

 in several series Rays neutral, 3-toothed. Receptacle fimbrillate. 



1. Cr. pulchella Foug. Annual, 10^-15^ high : leaves oblong-lanceo- 

 late, coarsely dentate, sessile : rays brownish at base, yellow above. — 

 Found as a waif near Atherton. May-September. 



36. BOEBERA Willd. 



Leaves pinnately divided, opposite. Heads small, peduncled. Prin- 

 cipal involucral bracts in a single series, united at base. Rays pistillate, 

 short. 



1. D. papposa (Vent.) Rydb. Fetid Marigold. Much branched 

 annual, 3^-24^ high. — Common in dry grounds and waste places. June- 

 October . 



37. ACHILLEA L. 



Perennial herbs with alternate, very finely dissected leaves. Heads 

 corymbose, numerous. Involucral scales imbricated in several series, 

 Ray flowers fertile. Pappus none. 



1. A. Millefolium L. Milfoil. Yarrow. 1°-4° high, somewhat 

 tomentose : rays 4-5, about V^ long. — Common in dry grounds. May- 

 September. 



38. ANTHEMIS L. 



Leaves alternate. Heads long-peduncled, Involucral scales imbricated 

 in several series. 



Plants strongly ill-scented. 1. A. Cotida. 



Plants not ill-scented. 2. A. arvensis. 



1. A. Cotula L. Dog-fennel. Branching annual, l°-2° high, ap- 

 pressed-pubescent : rays neutral : pappus none. — A common weed in 

 waste places. May-September. 



2. A. arvensis L Field Camomile. Resembles the last but pubes- 

 cent : rays pistillate : pappus a minute border. — Has been found as a waif 

 near Sheffield and Courtney. May-August. 



39. CHRYSANTHEMUM L. 



Leaves alternate. Heads long-peduncled. Involucral scales imbricated 

 in several series. Ray flowers fertile. Pappus none. 



1. C. Leucanthemum L. Ox-eye Daisy. Glabrate perennial, 1°- 

 3° high : stems leaves oblong, cut-serrate, more or less clasping : heads 

 y-2^ broad : rays 20-30. — Locally adventized in waste places and fields 

 near Sheffield, Waldo Park, Lee's Summit, Sibley, Glendale and Court- 

 ney, 



