80 MIDDLESEX FLORA. 



D. TATULA, L. PURPLE THORN-APPLE. 



More common than the preceding. July-Sept. Nat. from Trop. 



Am. 

 D. inermis, Jacq. 



Cambridge, rubbish heap, 1884 & 1885 (Walter Deane). July-Sept. 



Adv. from Africa. 



" Stem branching, hollow, terete, smooth ; leaves long petioled, 



smooth on both sides, acute, incised into acute lobes ; flowers on 



short, winged petioles ; calyx 5-angled, smooth ; corolla twice the 



length of the calyx, with roundish, cuspidate lobes ; cap?ule ovate, 



obtuse, smooth, unarmed, always erect, four valved." DC. Prodr. 



XIII. I. 539. 

 D. meteloides, DC. 



Cambridge, rubbish heap (Walter Deane; specimen in herb. of). 



July-Sept. Adv. from Mexico. For description, see Wood's Bot. 



&F1. 



NlCOTIANA, L. 



N. Bigelomi, Wats. 



Lowell, waste ground (Dr. C. W. Swan) ; N. Chelmsford, wool- 

 waste (Rev. W. P. Alcott). Adv. from Cal. For description, see 

 Gray, Syn. Fl. N. A. 



GENTIANACE>. GENTIAN FAMILY. 



S ABB ATI A, Adans. 



*S. chloroides, Pursh. 



Concord, introduced from Weymouth, Mass., by Minot Pratt. ^A 

 form with white flowers was introduced with the type. July-Sept. 



GENTIANA,"L. 



G. crinita, Froel. FRINGED' GENTIAN. 



Not uncommon save in the vicinity of U cities, where it is becoming 



rare. A form with pink flowers at So. Sudbury (Geo. H. Whitney) ; 



a form with white flowers occasional. Sept. 

 G. Andrewsii, Griseb. CLOSED GENTIAN. 



In most parts of the county, but less common than the preceding 



species. Aug.-Sept. 



[BARTONIA, Muhl. 



B. tenella, Muhl. 

 In most parts of the county, but not very common. Aug.-Sept. 



