The Flora ok the Cayuga Lake Basin 421 



24. Chrysanthemum (Tourn.) L. 



a. Heads 4-6 cm. in diam., solitary ; leaves pinnately incised. 



b. Basal leaves spatulate-obovate, crenate ; middle and upper cauline leaves oblong or 



oblanceolate, crenate or dentate. 1. C. Leucanthemum 



b. Basal leaves coarsely and irregularly toothed or pinnatifid; middle and upper 



cauline leaves narrowly oblong or oblanceolate, subpinnatifid at base; (heads 



slightly smaller). la. C. Leucanthemum, 



var. pinnatifidum 

 a. Heads 2 cm. in diam. or less, corymbose; leaves 2-pinnately divided. 



2. C. Parthenhim 



1. C. Leucanthemum L. Daisy. 



Lawn, Baker Laboratory, C. U. campus, 1925 (5*. H. Bumham). Probably estab- 

 lished. 

 Newf. and e. Que. to N. J.; rare southw. Naturalized from Eu. 



la. C. Leucanthemum L., var. pinnatifidum Lecoq & Lamotte. Daisy. 



A weed in hayfields and by roadsides, generally in gravelly soil ; very common. 

 June-July, rarely later. 



General in n. e. U. S., less abundant in the South and West. Naturalized from 

 Eurasia. 



A plant with rays all tubular and deeply lobed was found on a drumlin in the 

 northeastern corner of Butler Township. 



2. C. Parthenium (L.) Bernh. Feverfew. 

 Gravelly soil ; rare. July. 



Escaped from gardens : "thoroughly established throughout Stevens Woods on 

 west shore of Cayuga" (£>.); "occasional near Inlet and in Ithaca" (D.) ; Forest 

 Home; Six Mile Creek; Kidders. 



Native of Eu. 



25. Tanacetum L. 



a. Ultimate divisions of the leaves sparingly incised-serrate. 1. T.vulgare 



a. Ultimate divisions of the leaves finely and closely denticulate, la. T. vulgare, 



var. crispum 

 1. T. vulgare L. Tansy. 



Roadsides and waste places, in gravelly or sandy soil ; frequent. July-Sept. 



Near White Church ; Cayuga Heights ; Lake Como ; South Lansing ; Levanna ; 

 Merrifield ; Union Springs ; Canoga. In the northern part of the Cayuga Lake 

 Basin, this species is more common than the following variety. 



N. S. to Minn, and Oreg., southw. to Ga., Mo., and Nev. Introduced and natural- 

 ized from Eu. 



la. T. vulgare L., var. crispum DC. 



In localities similar to the preceding ; more frequent. 



West Danby ; Caroline Pinnacles; Brookton; upper Enfield Glen; n. of Coy 

 Glen; Esty; Taughannock; Union Springs; Montezuma. In the southern part of the 

 Cayuga Lake Basin, this variety is more common than the typical form. 



Range approximately the same as that of the typical form. Naturalized from Eu. 



26. Artemisia L. 



a. Leaves green and glabrous, or nearly so, on both surfaces. 



b. Leaves 1 -pinnatifid, the divisions 1-4 mm. wide, coarsely toothed. 



1. A. biennis 



