ERICACEAE. 71 



4. HETEROCODON, Nuttall. 

 H. rariflorum, Nutt. Stems filiform: leaves orbicular, toothed, BmalL 



EKICACEiE. 



Suborder I. VACCINIEiE. 

 Shrubs (some low and herbaceous): ovary inferior becoming an edible berry. 



Suborder II. ERICINEJE3. 

 Shrubs or trees: calyx free, usually small: corolla gamopetalous (except 11, 12). 

 * Fruit herry-Uke or fleshy: flowers drooping: corolla ovoid to campanulate with small lobes: 

 stamens 8 or 10 included: hark shedding from at least the branches: leaves evergreen, 

 coriaceous. 



Tree: flowers in large panicles: orange-red berries many seeded 3 



Shrubs: flowers in small racemes: fleshy fruit, 1-10 seeded 3 



Shrubs, low or prostrate: flowers axillary: berries black or red 4 



** Fruit, a dry, many-seeded capstde: flotuers nodding: anthers awn-tipped. 



Shrub, 3 or 4 ft. high: oblong leaves 1 to 3 inches long 5 



Shrub, a foot high or less: small scale-like leaves in 4 ranks 6 



* * * Fruit a dry capstde, splitting between the cells: aniJiers not atoned. 

 t Corolla gamopetalous. 

 Low Alpine evergreen; leaves revolute: flowers umbellate or corymbose: 



Leaves linear, crowded corolla not pouched 7 



Leaves oblong, opposite; corolla 10-ribbed, from 10 depressed pouches. 8 



Nota,lpine: leaves crowded at the ends of branches, entire. 



Corolla usually 4-toothed. ovoid to cylindrical, dull purple. »^. ...*... 9 



Corolla usually 5-lobed, limb spreading, white to rose 10 



t + Corolla polypetalons or nearly so. 



Flowers in corymbs or umbels, erect, white, cherry -like .- 11 



Flowers solitary, nodding, reddish .^ 12 



Suborder I [L, PYROLEiE. 



Perennials, herbaceous or slightly woody with smooth evergreen leaves (except one species 

 in No. 1.5): flowers nodding, polypetalons; petals broad: ovary superior: stamens 10: 

 anthers in bud extrorse, at length by inversion introrse with 2-horned base above. 



Flowers umbellate or solitary on a leafy woody stem 13 



Flowers solitary on a short scape: petals spreading 14 



Flowers in a racemo on a scape; petals concave, incurved 15 



