22 



EuvACCiNiuM, Gray. 



Corolla ovate to globular, more or less urceolate, 4-5 toothed, 

 rose or white; filaments glabrous; anthers 2-awned, included; 

 ovary and berry 4-5 celled with no false partitions ; leaves decid- 

 uous ; flowers drooping, solitary or 2 or 4 together, developing 

 with or soon after the leaves. 



C. Corolla commonly 4-lobed ; stamens 8 V. ub'ginosum 



CC. Corolla commonly 6-lobed ; stamens 10. 

 D. Plants dwarf, a foot or less high. 



E. Branches not angled V. ccespitosum 



EE. Branches sharply angled V. Myriillus 



DD. Plants taller, 1—12 feet high. 



E. Margins of leaves sharply serrulate. 



V. myrtilloides 

 EE. Margins of leaves entire (except in ovali- 

 Jolium) . 

 F. Size of leaves }4 in. long. 



V. ovaliJoUum 

 FF. Size of leaves H-X in. long. 



V. parvifolium 

 V. Mortinia 



Vitis-Idaea (Koch.) Gray. 



Corolla cylindraceous, ovate, or globose-campanulate, more or 

 less urceolate, rose or nearly white, 4-5 lobed, stamens included, 

 filaments hairy; anthers awnless (or with short awns); leaves 

 coriaceous and persistent ; flowers in short racemes or clusters 

 from separate buds ; bracteate and 2-bracteolate. 

 C. Ovary 5-celled ; stamens 10. 



D. Branchlets pubescent V. ovatum 



DD. Branchlets glabrous V. crassifolium 



CC. Ovary 4-celled ; stamens 8. 



D. Branches short (3-4 in.) from creeping stems 



V. Vitis-Idaea 

 BaTodendroNj Gray. 



Corolla open-campanulate, 5 lobed ; anthers tipped with long 

 slender tubes, and 2-awned on the back ; ovary and (hardly edi- 

 ble) berry falsely lo-celled; leaves rather firm in texture but 

 deciduous; flowers axillary and solitary or in leafy-bracted 

 racemes, slender pedicelled, bractlets minute or none. 



C. Anthers included V. arhoreum 



CC. Anthers exserted V. stamineum 



