20 MIDDLESEX FLOKA. 



E. moscJiatiim, Willd. 

 Lowell and Westford, near woollen mills; Chelmsford, numerous 

 thrifty plants in a garden dressed with wool-waste (Dr. C. W. 

 Swan). Adv. from Eu. via California. 



"Leaves pinnate, the oblong ovate leaflets unequally and doubly 

 serrate ; stipules conspicuous ; pedicels mostly shorter and stouter, 

 (than in E. cicutarium) ; sepals larger, 3 or 4 lines long ; odor 

 musky Bot. Cal. 



Impatiens, L. 



I. fulva, Nutt. Jewel-Weed. 

 Common. June-Sept. 



OXALIS, L. 



O. Acetosella, L. Wood-sorrel. 

 Ashby, (E. Adams Hartwell) ; Concord, 1862 (Horace Mann). As 

 this plant was introduced into Concord by Miuot Pratt, it is probable 

 that Mann's specimen came from this source. June. Very rare. 



O. violacea, L. Violet Wood-sorrel. 

 Newton (E. B. Keririck, Hovey's Mag., 1836); Concord, 1862 

 (Horace Mann) ; Belmont, rare, open field, 1883 (Walter Deane) ; 

 Weston, rather common, 1887 (Walter E. Coburn). May-June. 



O. corniculata, L., var. stricta, Sav. (O. stricta, L., Man.) 

 Common. May-Sept. 



RUTACE/^. RUE FAMILY. 



Xanthoxtlum, Colden. 



X. Americanum, Mill. Northern Prickly Ash. 

 Medford, Chelmsford, Westford, Acton, et al. Possibly introduced. 

 April-May. 



Ptelea, L. 



P. trifoUata, L. Hop-tree. 

 Somerville, Medford, et al. Occasionally spontaneous. From 

 farther South. June. 



SIMARUBACEyE. 



AlLANTHUS, Willd. 

 A. GLANDULOSUS, Dcsf . TREE OF HEAVEN. 



In many places spreading from seed and by suckers. June. Nat. 

 from China. 



