Bidens COMPOSITAE Cosmos 



B. cemua L. Nodding Bur Marigold. 



Infrequent, in low ground, in both provinces of Cecil and New 

 Castle Counties. Aug., mid-Oct. 



B. laevis (L.) BSP. (B. chrysanthemoides Mx.) Large Bur 

 Marigold. 

 Common in swamps and shallow water of river shores, from the 

 Fall Line to Kent (Del.) and Talbot Counties; rare in Northampton 

 County: moist dune hollows. Savage Neck, Fernald & Long, 5560, 

 11 Oct. 1935 (P) ; swampy woods s. of Kendall Grove, Fernald, Long 

 & Fogg, 5561, 13 Oct. 1935 (P). Aug. to mid-Oct. 



B. bipinnata L. Spanish Needles. 



Common; fields, roadsides and waste ground. New Castle and 

 Cecil Counties; infrequent farther south: pine woods near the dunes, 

 Rehoboth (S), Larsen, 442, 16 Oct. 1933 (A, P); roadside n. w. of 

 Oyster (No), Fogg, 10059, 14 Oct. 1935 (P); woods 2 mi. s. w. of 

 Unionville (Ta), Earle, 3735, 5 Sept. 1942 (A). Mid- Aug. to mid- 

 Oct. 



B. coronata (L.) Fisch. var. trichosperma (Mx.) Fern. (Coreopsis 

 trichosperma Mx. See Fernald: Rhodora 40, 348-351. 

 1938.) 

 Infrequent; swamps, marshes and river shores, from the Fall 

 Line to Sussex County. Late Aug. to early Oct. 



Var. brachyodonta Fern. (B. coronata of manuals.) 



Rare: high ground near Newport (NC), Canby, 9 Sept. 

 1899. Cited by Fernald, 1. c. 



B. polylepis Blake. (Coreopsis involucrata Nutt.) 



Very abundant in Delaware River marshes, Wilmington, and 

 spreading inland to fields and roadsides; occasional southward: 

 field n. of Georgetown (S), R. R. Tatnall, 2343, 25 Aug. 1934 (T P); 

 roadside just n. of Oak Hall (Ac), R. R. Tatnall, 2792, 2 Sept. 1935 

 (T, G). Mid- Aug. to mid-Sept. 



First appeared in our area, as an introduction from mid- western 

 U. S., about the beginning of this century. See Canby: Rhodora 

 2, 34. 1900. 



Cosmos Cav. 



C. bipinnatus Cav. 



Cultivated, and often spontaneous in waste places in northern 



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