12 MIDDLESEX FLORA. 



CISTACE.^. ROCK-ROSE FAMILY. 



Helianthemum, Tourn. 



H. Canadense, Michx. Frost-weed. 

 Commou. Juue-Aug. 



Lechea, L. Pinweed. 



L. major, Michx. 

 Rather common. Aug-Sept. 



L. thymifolia, Pursh., (including L. maritima, Legg.) 

 Chelmsford (Dr. C. W. Swan) ; Newton (C. J. Sprague) ; Bedford 

 (Mrs. 0. M. FitcliV Aug.-Sept. Too near L. minor. 



L. tenuifolia, Michx. 

 Maiden, Winchester, Westf ord, et al. Rather common. Aug-Sept. 

 "Leaves of radical shoots lanceolate, much longer than broad. 

 Generally low and spreading; capsules large and conspicuous. 

 The inner sepals even when broad, have only a midrib, and no side 

 veins ; all the other species have more or less distinctly 3 veins or 

 ribs, rising from the base. The outer sepals about equal the inner 

 in length." VV. H. Leggett in Torrey Bulletin, VI. 251. 



L. minor", L., (including L. intermedia, Legg.? and L. minor 

 var. intermedia, Legg.) 

 Westford, Bedford, Cambridge, et al. Rather common. July-Sept. 



L. racemulosa. Lam. 

 Ashland and Melrose (Rev. Thos. Morong). 



"Leaves of radical shoots elliptical, ovate, or oblong, not more 

 than two or three times as long as broad. Easily distinguished by 

 its slender spreading pedicels, oblong flowers, and broadly lanceo- 

 late stem leaves. Outer sepals shorter." W. H. Leggett in Torrey 

 Bulletin, VI. 251. 



DROSERACE/E. SUNDEW FAMILY. 



Drosera, L. 



D. rotundifolia, L. Round-leaved Sundew. 

 Not uncommon. July-Aug. 



D. intermedia, Drev. and Hayne, var. Americana, DC. (D. 

 longifolia, L., Man.) 

 Commou. July-Aug. 



