MIDDLESEX FLOEA. 27 



ROBINIA, L. 

 E. PSEUDACACIA, L. LOCUST. 



Eather common. June. Nat. from the Middle States. 



E. viscosA, "Vent. Clammt Locust. 

 Lowell, escaped (Dr. C. W. Swan) ; Ashland, sparingly naturalized 

 (Eev. Thos. Morong) ; Littleton, escaped (L. L. Dame). Slowly- 

 spreading in favorable localities. June. Int. from Va. 



E. HispiDA, L. Bkistlt Locust. Eosb Acacia. 

 Ashland, sparingly naturalized (Eev. Thos. Morong); Maiden, 

 where it has formed dense thickets, and is spreading (F. S. Collins). 

 June. From the South. 



Tephrosia, Pers. 



T. Virginiana, Pers. Goat's Rue. Tephrosia. 

 Not found in the eastern towns, and nowhere very abundant. July. 



Desmodium, DC. 



D. nudiflorum, DC. 



Common. Scape occasionally leafy. Aug. 

 D. acurninatum, DC. 



Not uncommon. July-Aug. 

 D. rotundifolium, DC. 



Not uncommon in the eastern part of the county. Aug. 

 D. rotundifolium, DC, var. glabratum, Gray. 



Woods in Waltham (Bigelow's Fl. Bost., under Hedysarum humi- 



fusutn). County specimen in herb. Edwin Faxon. Aug. 

 *D. canescens, DC. 



Eoadside, Arlington, Aug., 1853 and 1869 (Wm. Boott). 

 D. cuspidatum. Hook. 



Lowell (Dr. C. W. Swan) ; Woburn (L. L. Dame). Rare. July- 

 Aug. 

 D. Dillenii, Darl. 



Medford (Mrs. P. D. Eichards) ; Westford (Misses Fletcher and 



Hodgman) ; Lowell, Dracut and Townsend (Dr. C. W. Swan) ; 



Maiden and Wilmington (F. S. Collins). Aug. 

 D. paniculatum, DC. 



Widely distributed, but not very common. July. 

 D. Canadense, DC. 



Eather common. A form with white flowers reported at Newton 



by W. H. Manning. July-Aug. 

 D. rigidum, DC 



Not uncommon in the northern and western towns of the county ; 



reported also at Woburn by Mi-s. P. D. Eichards. Aug. 



