52 MIDDLESEX FLOKA. 



RUDBECKIA, L. 



R. laciniata, L. 



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



Aug. 

 R. hirta, L. CONE-FLOWER. 



Common. July-Aug. 



HELIANTHUS, L. 



H. annuus, L. COMMON SUNFLOWER. 



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. 

 H. petiolaris, Nutt. 



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



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

 H. TUBEROSUS, L. JERUSALEM ARTICHOKE. 



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



Collins); Concord (Minot JPratt). 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. 

 C. 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. SWAMP BEGGAR-TICKS. 



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



but common elsewhere. Aug.-Sept. 

 B. cernua, L. SMALLER BUR-MARIGOLD. 



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



