MIDDLESEX FLORA. 11 



V. palmata, L. HAND-LEAVED VIOLET. 



Groton (C. W. Jenks) ; Melrose (Rev. Thos. Morong) ; Stoneham 

 (G. E. Davenport) ; Fresh Pond, Cambridge, specimen in Gray 

 Herb. April -June. 



" The late Prof. Tuckerman long ago (1839) collected at Concord 

 specimens which would surely pass for V. pedatifida, if from the 

 valley of the Mississippi." U V. pedatifida is indeed probably only a 

 marked geographical variety of V. palmata." Gray's Rev. N. A. 

 Violets. 



V. palmata, L., var. cucullata, Gray. 



The common county form; including var. CO rdata, Cambridge, 



(T. W. Harris, Hovey's Mag., Vol. VI., 1840; C. E. Perkins. 1882). 



April-June. 

 V. sagittata, Ait. ARROW-LEAVED VIOLET. 



Very common. April-June. 

 V. pedata, L. BIRD-FOOT VIOLET. HORSE-SHOE VIOLET. 



Common. Often light blue or white. May-June. 

 V. canina, L., var. Muhlenbergii, Gray (V. canina, L., var. 



sylvestris, Regel, Man.) DOG VIOLET. 



Widely distributed, but not common. May-July. 



* V. rostrata, Muhl. 



Concord, introduced from the North by Minot Pratt. June-July. 



* V. striata, Ait. PALE VIOLET. 



Concord, introduced from the West by Minot Pratt. May-July. 

 V. Canadensis, L. 



Concord, introduced from the North by Minot Pratt ; doubtfully 



reported elsewhere. July. 

 V. pubescens, Ait. (including var. eriocarpa, Nutt., of Man.) 



YELLOW VIOLET. 



Throughout the county, but nowhere abundant. May. 

 V. TRICOLOR, L. PANSY. HEART'S EASE. 



Somerville (C. E. Perkins) ; Ashland, naturalized about old houses 



(Rev. Thos. Morong). April-May. Nat. from Eu. 



* V. cornuta, L. 



Concord, introduced from Europe by Minot Pratt. 

 "Root fibrous, diffuse; stems ascending; leaves cordate-ovate, 

 crenate, ciliate ; stipules obliquely cordate, inciso-dentate, ciliate ; 

 sepals subulate; the subulate spur longer than the calyx." DC., 

 Prodr. I. 301. 



