198 COMPOSITAE 



Mature basal leaves W-W wide. 1. A. ocHdeniaJis. 



Mature basal leaves 3''-6" wide. 2. A. eampestris. 



1. A. occidentallB Greene. Basal leaves ovate, lJ'-2' long, 9"-15"' 

 wide, tapering into a petiole, 1' long, strongly 3-5-nerved : stems 9'-12' 

 high : heads corymbose. — Common in dry woods. April-May. 



2. A. campestiis Rydb. Basal leaves oblanceolate to obovate, thick, 

 S" wide, tapering at the base, not distinctly petioled, usually one-nerved, 

 1' long : stems Z'-Vi' high. — In dry grounds throughout. Rather common. 



April-May. 



16. GNAPHALIUM L. Everlasting. 



Woolly herbs with alternate leaves. Involucral bracts imbricated, 

 scarious. Outer flowers pistillate. Central flowers perfect. 



Heads corymbose. 1. G. ohtvMfoUum. 



Heads spicate. 2. G. purpureum. 



1. G. obtusifolium L. Annual, erect, l°-3° high : leaves sessile, 

 lanceolate, undulate : pappus bristles distinct. — In dry woods through- 

 out, but rather rare. July-October. 



2. G. purpureum L. Annual, erect, 6'-2(>' high : leaves spatulate : 

 pappus bristles united below. — In dry flelds near Courtney and Grain 

 Valley. Rare. May-July. 



17. INULA L. 



Coarse herbs. Involucre imbricated. Ray flowers pistillate. Disk 

 flowers perfect. Achenes 4-5-ribbed. 



1. I. Helenium L. Elbcampane. Perennial, 3°-6° high : leaves 

 ovate-oblong, downy beneath, denticulate : heads 2'-4' broad. — Common 

 locally along Spring Branch east of Independence ; also near Court- 

 ney. July-September. 



18. POLYMNIA L. 



Perennial herbs with opposite leaves and corymbose flowers. Involu- 

 cral bracts in two series, the outer consisting of five large bracts, the inner 

 of numerous small ones, subtending the achenes. Pappus none. 



1. P. Canadensis radlata A. Gray. Leaf Cop. 2°-5° high, viscid- 

 pubescent : leaves deltoid-ovate, denticulate, pinnatifid : rays five, 

 white, 3" long, 3-lobed. — Common in rich rocky woods along the Mis- 

 souri River bluffs at Kansas City. June-September. 



19. SILPHIUM L. 



Stout perennial herbs with corymbose-paniculate flowers. Involucral 

 bracts imbricated. Ray flowers in 2-3 series. Achenes flat, 2-winged, 

 without pappus, or with two teeth confluent with the winged margins. 



Leaves opposite.. 



Leaves strongly connate-perfoliate. 1. S. perfoliatum. 



Leaves sessile merely. 2. S. iutegrifolium. 



Leaves alternate. 3. S. ladniatum. 



