44 MIDDLESEX FLORA. 



SAMBUCUS, Tourn. 

 S. Canadensis, L. ELDER. 



Common. July. 



S. racemosa, L. (S. pubens, Michx., Man.) RED-BERRIED ELDER. 

 Ashby, not uncommon (L. L. Dame) ; occasional in other parts of 

 the county. In the Concord station the plant was introduced from 

 Wachuset by Minot Pratt. May. 



VIBURNUM, L. 



V. cassinoides, L. (V. nudum, var. cassinoides, Man.) WITHE- 

 ROD. 



Not very common in the eastern part of the county; abundant at 



Ashby and vicinity. June. 

 V. Lentago, L. SWEET VIBURNUM. SHEEP-BERRY. 



Bather common. May-June. 

 V. dentatum, L. ARROW-WOOD. 



Common. June. 

 V. acerifolium, L. MAPLE-LEAVED VIBURNUM. 



Eather common. June. 

 V. Opulus, L. CRANBERRY TREE. 



Groton (C. W. Jenks) ; Weston (L. L. Dame) ; Pepperell (Dr. C. W. 



Swan) ; Concord, introduced from Vermont by Minot Pratt. June. 

 V. lantanoides, Michx. HOBBLE-BUSH. 



Ashby, not uncommon (W. H. Manning). Not authoritatively 



reported elsewhere. May-June. 



RUBIACEyE. MADDER FAMILY. 



GALIUM, L. 



G. Aparine, L. CLEAVERS. GOOSE-GRASS. 



Lowell, "dumps" (Dr. C. W. Swan) ; Medford (C. E. Perkins) ; 



Waltham List; Townsend (Miss H. E. Haynes). Bare. May. 

 r. Mollugo, L. 



McLean asylum grounds, Somerville (C. E. Perkins). Adv. from 



Eu. 

 G. asprellum, Michx. ROUGH BEDSTRAW. 



Common. July-Aug. 

 G. trifidum, L., (including var. tinctorium, of the Manual.) 



SMALL BEDSTRAW. 



Common. June-July. 

 G. triflorum, Michx. SWEET-SCENTED BEDSTRAW. 



Generally distributed, but not very common. July. 

 G. pilosum, Ait. 



Lowell (Dr. C. W. Swan) ; Maiden (H. A. Young) ; Concord (Minot 



Pratt) ; Waltham (Wm. Boott). Rare. June-Aug. 



