HORTICULTURAL STATUS OF THE GENUS VACCINIUM. I35 



Cyanococcus, Gray. 



Corolla cylindraceous to campanulate-oblong or ovoid, 5- 

 toothed ; filaments hairy ; anthers awnless, included ; ovary and 

 berry more or -less 10-celled by false partitions; berry blue or 

 black, usually with bloom, edible, many seeded ; flowers, short 

 pedicelled, (white or rose) in fascicles or very short racemes, 

 developed with or a little before the leaves ; buds separate, large, 

 scaly ; bracts and bractlets caducous or deciduous. 

 C. Foliage evergreen, coriaceous. 



D. Calyx-teeth roundish and very dense. V. nitidum 



DD. Calyx-teeth acute. . V. Myrsinites 



CC. Foliage deciduous (sometimes tardily so in southern 

 forms). 



D. Corolla cylindraceous V. Virgatum 



DD. Corolla short and usually broad. 



E. Branchlets hirsute F. Mrsutum 



FF. Branchlets glabrous or glaucous (except in 

 V. Ganadense). 

 F. Leaves glaucous and pale beneath. 



V. vacillans 

 FF. Leaves strongly pubescent both sides. 

 .'•«'.■". V. Ganadense 



and var. atrococcum of corymbosum 

 FFF. Leaves glabrous, often hairy on mid- 

 rib beneath. 

 G. Margin of leaves bristly-serru- 

 late. 

 H. Fruit mostly blue. glaucous. 

 V. Pennsylvanicum 

 HH. Fruit black. . . V. nigrum 

 GG. Margin of leaves entire or at 

 most ciliate. V. corymbosum 



a horticultural classification. 

 As already indicated, the genus under consideration includes 

 many species of particular importance as food plants, others 

 which are useful only for ornament, and some which are valuable 

 for both purposes. The following key to the more commonly 

 known species is based upon leading horticultural characters. 



