76 Annals of the Carnegie Museum. 



tario (Macoun, 62,956); Stittsville, Ontario (Macoun) ; New Haven, 

 Vermont (Brainerd). 



The following key, arranged mainly in accordance with the plan 

 followed in Britton's Manual, 5 will serve to more clearly contrast the 

 diagnostic characters of the species of Lonicera, as now recognized as 

 occurring in northeastern North America. 



Key to the Species of Lonicera Occurring in the Northeastern 

 United States and Canada. 

 Vines. 



Flowers in heads or interrupted spikes. 

 Corolla two-lipped. 



Corolla glabrous within. I. Z. Caprifolium Linnaeus. 



Corolla pubescent. 



Leaves pubescent, at least beneath ; corolla yellow. 



Corolla-tube slightly gibbous at base ; leaves pubescent, both 

 sides, at least when young, ciliate. 



2. L. hirsuta Eaton. 



Corolla-tube strongly gibbous at base ; leaves glabrous above, 

 pubescent beneath, scarcely, if at all, ciliate. 



3. Z. glaucescens Rydberg. 

 Leaves glabrous, beneath very glaucous. 



Corolla greenish-yellow, the tube somewhat gibbous. 



Corolla-tube 6-10 mm. long ; filaments hirsute at base. 



4. Z. dioica Linnaeus. 6 



Corolla 10-14 rnm. long ; filaments nearly glabrous. 



5. L. Sullivantii A. Gray. 



Corolla light yellow or orange, its slender tube not gibbous. 



6. Z. flava Sims. 

 Corolla tubular, the limb nearly regular. 



7. Z. sempervirens Linnaeus. 

 Flowers in pairs on short axillary peduncles. 



8. Z. Japonica Thunberg. 

 Shrubs ; flowers in pairs on axillary bracted peduncles. 



Bracts of peduncle subulate, linear, minute or none. 



Leaves rarely cordate, more or less pubescent, or ciliate. 



Leaves pale or glaucous, thick, strongly reticulate veined. 



Peduncles shorter than flowers ; fruit blue ; leaves ciliate. 



9. Z. (cerulea Linnaeus. 



Peduncles equalling or longer than the flowers ; fruit red ; leaves 

 not ciliate. 



5 Britton, N. L. " Manual of the Flora of the Northern States and Canada," 2nd 

 edit., 1905. 



6 ( Lonicera ciliata Muhlenberg. ) 



