KEYS LEAVES ALTERNATE xxv 



205.. Twigs and revolute leaves terete. p. 181. Ceratiola. 



Twigs flat-ribbed below the leaves. 206. 



206. Leaves quite entire: twigs glabrescent. p. 180. Empetrum. 

 Leaves microscopically toothed. 207. 



207. Twigs downy in the grooves. p. 179. Corema. 

 Twigs glabrous. p. 279. Phyllodoce. 



208. Delicate, trailing, the leaves not crowded. 209. 

 Not loosely trailing or else the leaves crowded. 210. 



209. Stems chaffy: leaves not white beneath, p. 297. Chiogenes. 

 Stems not chaffy: leaves white beneath, p. 295. Vaccinium. 



210. Leaves very narrow: plants small, moss-like. .211. 

 Leaves broader: plants not at all moss-like. 212. 



211. Leaves glabrous. p. 282. Cassiope. 

 Leaves white-hairy. p. 240. Hudsonia. 



212. Not forming distinct leaf-scars. 213. 



Leaves finally falling from clean-cut scars. 214. . 



213. Leaves obtuse, spatulate, outcurved. p. 300. Diapensia. 

 Leaves acute, oblanceolate. p. 301. Pyxidanthera, 



214. With stipules. p. 100. Cotoneaster. 

 Without stipules. 215. 



215. Leaves neither toothed nor dotted. 216. 



Leaves minutely toothed, or else dotted beneath. 217. 



216. Leaves densely woolly beneath. p. 280. Daboecia. 

 Leaves not woolly. p. 292. Arctostaphylos. 



217. Leaves elongated or else pungent. p. 291. Pernettya. 

 Leaves relatively broad, not pungent. 218. 



218. Leaves broadest below the middle. p. 294. Gaylussacia. 

 Leaves broadest above the middle. p. 295. Vaccinium. 



219. Without leaf-scars. 220. 



With large leaf-scar on deciduous sheath, p. 45. Coccoloba. 

 With leaf-scars on stem or on leaf cushion or petiole. 224. 



220. Trailing hairy evergreen : leaves elliptical, p. 289. Epigaea. 

 Not trailing. 221. 



221. Leaf -bases not overlapping: petiole torn. p. 115. Rubus. 

 Persistent leaf-bases overlapping at least on spurs. 222. 



