80 MIDDLESEX FLORA. 



D. Tatdla, L. Purple Thorn-Apple. 



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



Am. 

 D. inermis, Jaeq. 



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 calj^x, with roundish, cuspidate lobes; capsule ovate, 



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



Xm. 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. 



NiCOTIANA, L. 



N. Bigelovii^ Wats. 

 Lowell, w^aste ground (Dr. C. W. Swan) ; N". Chelmsford, wool- 

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

 Gray, Syn. Fl. N. A. 



GENTIANACEv^. GENTIAN FAMILY. 



Sabbatia, Adans. 



*8. 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 cities, where it is becoming 



rare. A foim 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. 



