36 
32. 
33. 
34. 
35. 
39. 
40. 
As 
UNDERSHRUBS. 
Leaves rather broad. Kalmia. 
Leaves narrow and small. 33. 
Leaf-whorls densely crowded. Erica. 
Leaf-whorls separated, some leaves alternate. Corema. 
Deciduous Undershrubs. 
Leaves opposite, with pellucid dots. Ascyrum. 
Leaves alternate. 35. 
Leaves conspicuously resinous-glandular. Gaylussacia. 
Leaves scurfy. Chamaedaphne. 
Leaves neither resin-dotted nor scurfy. 39. 
Leaves very sparingly scurfy beneath. Menziesia. 
Leaves not at all scurfy. 37. 
. Leaves curly-hairy and resinous. Rhododendron (Rhodora). 
Not resinous or woolly, when mature. Vaccinium. 
. With trailing leafy stems. 309. 
Forming single few-leaved stems or tufts. 57. 
Trailing Plants. 
Evergreen. 40. 
Deciduous. 54. 
Prickly: leaves compound. 41. 
Unarmed: leaves simple. 42. 
Evergreen Trailers—Armed. 
Leaves digitate: petiole breaking above base. Rubus. 
Leaves pinnate: leaf-scar on the stem. Rosa. 
Evergreen Trailers—Unarmed. 
. Leaves alternate. 43. 
Leaves opposite or whorled, net minute. 49. 
Leaves 4- or 6-ranked, minute. 53. 
. Aromatic, wintergreen-flavored. Gaultheria. 
Acrid: leaves fleshy, scale-like. ' Sedum. 
Not aromatic or very acrid. 44. 
. Leaves characteristically lobed. Hedera. 
Leaves not lobed. 45. 
. Leaves revolute. 46. 
Leaves not revolute. 47. 
. Leaves short-elliptical, rough. Chiogenes. 
Leaves elongated and narrow. Daphne. 
