519 



Specimens examined: 



Maine, St. Francis, St. John's River, Aug. lo, 1893. M. L. Fernald. 



Canada, Notre Dame du Lac, Temiscouata Co. Aug. 6, 1887. John L. 



Northrop. 



New York, near Elizabethtown, Essex Co. Sept. 5, 1892. N. L. Britton 

 « Tannersville, Green Co. Aug. 7, 1891. Miss Anna Murray Vail. 



« White Plains, Westchester Co. Miss Phoebe McCabe. 



Massachusetts, Lenox. July 11, 1889. W. M. Whitfield. 



Pennsylvania, Lycoming Co. September 18, 1890. John K. Small and A. A. 

 Heller. 



West Virginia, Lone Tree Knob, Summit. C. F. Millspaugh, M. D. Flora of 



West Virginia, No. 450. 



Montana, Belt Mountains, near Hound Creek. Aug. 2, 1883. F. Lamson 



Scribner. 



Wyoming, Laramie Peak. Aug. 8, 1895. ^ven Nelson. Flora of Wyoming, 



No. 1653. 



I have also received the plant from Lewis and Ulster Coun- 

 ties, N. Y., and have collected it at York Harbor, Maine, the type 

 locality, and in the Pocono region of Pennsylvana. 



Type specimens from York Harbor are deposited in the Her- 

 baria of Columbia University, and the New York Botanical Garden. 



I take pleasure in naming this species in honor of Dr. N. L. 



Britton. 



To anyone not having given particular attention to our species 

 of Agrwionia it is altogether likely that this plant would pass un- 

 questioned for A. hirsuta. It has more the general aspect of that 

 species than of any other, the large fruit distinguishing it at once 

 from A. mollis, with which in some respects it appears to have 

 closer affinity. From hirsuta it may be readily distinguished by 

 reference alone to its hoary pubescent racemes and darker green 

 acuminate leaflets pubescent on the lower surface. It is less 

 glandulose and aromatic than hirsuta and grows to be stouter and 

 taller with straighter stem, stouter more ascending branches and 

 longer more virgate racemes. The hairiness of the stem is also 

 of a different character, being coarser and denser, with shorter, 

 stiffer hair. The leaves are commonly narrower and less spread- 

 ing, the thicker rugose-veiny leaflets more sharply serrate and 

 acuminate with pubescent lower surface bearing brighter glan- 

 dules and having the margins ciliolate instead of ciliate-fringed. 

 Numerous specimens of hirsuta have failed to show any indica- 



