52 MIDDLESEX ELOEA. 



RUDBECKIA, L. 



R. laciniata, L. 



Tewksbury, Lowell, Chelmsford, et al. Not very common. July- 

 Aug. 

 R. hirta, L. CoNE-FLo-vyEB. 

 Common. July-Aug. 



Helianthus, L. 



H. annuus, L. Common Sunplowee. 



Occasionally spontaneous. Aug.-Sept. Int. from Trop. Am. 

 H. strumosus, L. 



Widely distributed. Aug.-Sept. 

 H. divaricatus, L. 



Common. Aug.-Sept. 

 H. decapetalus, L. 



Lowell and Tewksbury (Dr. C. W. Swan) ; Medford (Mrs. P. D. 



Richards) ; Maiden (F. S. Collins). Not common. Aug.-Sept. 

 S. petiolaris, Nutt. 



Westford, woollen mill (Dr. C. W. Swan). Sept. Adv. from th© 



West. For description, see Gray, Syn. Fl. N. A. 

 H. TtTBEEOsus, L. Jerusalem Aetichoke. 



Maiden (K. Frohock) ; Melrose (H. L. Moody) ; Somerville (F. S. 



Collins); Concord (Minot [Pratt) .> Scarce. Sept. Nat. from the 



South. 



Coreopsis, L. 

 C. rosea, Nutt. 



Winchester and Woburn (Wm. Boott). Abundant about Winter 



and Round Ponds, but nowhere else in the county. Aug.-Sept. 

 O. aristosa, Michx. 



Lowell, " dump " (Dr. C. W. Swan). Aug. Adv. from the West. 

 C. trichosperma, Michx. Tickseed Sunflower. 



Maiden and Melrose (F. S. Collins) ; Fresh Pond (Bigelow's Fl. 



Bost.) ; Wakefield (Mrs. P. D. Richards) ; Concord (Minot Pratt). 



Abundant where it occurs at all. Sept.-Oct. 



Bidens, Tourn. 



B. frondosa, L. Beggar-ticks. 



Common. Aug.-Sept. 

 B. connata, Muhl. Svp^amp Beggaet-tioks. 



Not reported from the northern and western part of the county^ 



but common elsewhere. Aug.-Sept. 

 B. cernua, L. Smaller Bue-Marigold. 



Widely distributed, but rather scarce. Aug.-Sept. 



