18 MIDDLESEX FLOEA. 



M. crispa^ L. Curled Mallow. 

 Eeadiug (R. Frohock) ; Ashland, spontaneous (Rev. Thos. Morong). 

 Adv. from Eu. 



M. moschata, L. Musk Mallovt. 

 Lowell, roadside (Dr. C. W. Swan) ; Maiden (R. Frohock). July- 

 Sept. Adv. from Eu. 



M. Alcea, L. 

 Dracut, roadside ; Lowell, railroad bed ; Hopkinton, roadside (Dr. 

 C. W. Swan); Medford (Mrs. P. D. Richards). Tending to 

 establish itself. Adv. from Eu. 



M. BOREALIS, Wallm. 

 Lowell, Dracut and Westford, near woollen mills, (Dr. C. W. 

 Swan) ; E. Cambridge, Sept. 12, 1881 (C. E. Perkins) ; Cambridge, 

 1884 (Walter Deane). A native of Eu., but introduced in California 

 wool, and so common in the vicinity of woollen mills that it may 

 fairly claim naturalization. Aug.-Sept. 



"Annual, erect or somewhat decumbent, hairy or nearly glabrous; 

 leaves round-cordate, crenate, more or less strongly 5-7 lobed; 

 peduncles axillary, solitary or clustered, 1 to 3 lines long ; calyx- 

 lobes acute, becoming very broad and enlarged in fruit ; petals 2 or 

 3 lines long ; carpels transversely reticulate-rugose." Bot. Cal. 



SiDA. L. 



S. spinosa^ L. 

 Watertown (C. E. Perkins); Lowell, "dump" (Dr. C. W. Swan); 

 Maiden (F. S. Collins). Aug.-Sept. Probably introduced in 

 Southern cotton. 



Abutilon, Tourn. 



A. Avicennoe, Gaertn. Velvet-Leaf. 



Somerville, Cambridge, Bedford, et al. Tending to establish 

 itself. Aug.-Sept. Adv. from India. 



Hibiscus, L. 



H. moscheutos, L. Swamp Rose-Mallow. 



Widely distributed, but not abundant. Aug.-Sept. 

 H. Trionum, L. Bladder Ketmia. 



Ashland, occasionally escaped from gardens (Rev. Thos. Morong). 



Adv. from Eu. 



TILIACE>E. LINDEN FAMILY. 



TiLIA, L. 



T. Americana, L. Basswood. White-wood. Linden. 

 Rather common. June. 



