198 



American Midland Naturalist Monograph No. 4 



Leaves I/4 to 1'/4 inches long, light yellowish-green; berries 



red 13. V. parvifolium. 



Leaves ^4 to 2 inches long, bluish-green ; berries dark-blue 



with a bloom 14. V. ov all folium. 



Low or tall shrubs with ascending branches; leaves oval to egg- 

 shaped or reverse-egg-shaped, mostly pointed at the tips, 

 the margins finely toothed; berries flattened-globose, 



red-purple to black, with or without a bloom 



15. V . membranaceum. 



hig. 116. Cranberry {Vaccinium 

 macrocarpon). 



I. Cranberry (Vaccinium 

 macrocarpon Ait.), fig. 116. — - 

 Trailing or creeping evergreen 

 plants with slender more or less 

 woody stems; leaves narrowly el- 

 liptic to oblong, y^ to y^ inch 

 long, thickish, dark green above, 

 whitish below, often curled under 

 at the edges; flowers pink, the 

 corolla divided into 4 spreading 

 linear-oblong lobes ^ to % inch 

 long, borne in clusters of several 

 on short erect leafy branchlets, 

 these with a leafy shoot extending 

 beyond and above the flower-clus- 

 ter; berries globose to oblong, % 

 to % inch in diameter, dark red. 

 (Syn. Oxycoccus macrocarpus 

 Pers.) . 



OccuTTence. — isle ROYALE, widespread in bogs: 

 head of Rock Harbor near start of Lake Richie 

 trail; Forbes Lake; Sumner Lake. 



2. Small Cranberry {Vaccinium oxy- 

 coccus L.), fig. 117. — Similar to V. macro- 

 carpon but the stems more slender; leaves 3/16 

 to % inch long, egg-shaped to oblong-egg- 

 shaped, the margins strongly curled under; 

 flowers smaller, the petal-like lobes not more 

 than 14 i"<^h Io"g) borne in clusters of 1 to 4 

 at the ends of the branchlets, without a leafy 

 shoot extending above the flower-cluster; ber- 

 ries globose or somewhat pear-shaped, /4 to % 

 inch in diameter, dark red. 



A somewhat coarser variety. Western small 

 cranberry (var. intermedium Gray), with 

 leaves up to % inch long, and with more 



Fig. 117. Small cranberry 

 (^Vaccinium ox}^cocciis). 



