646 VACCINIACEAE 



late, 4- or 5-toothed. Stamens 8-10; filaments hairy; anthers awnless. Ovary 

 and fruit 4-5-celled, without false partitions. Fruit in ours red, sour. 



1. V. Vitis-Idaea (L.) Britton. Low shrub, 1-5 dm. high; leaves thick, per- 

 sistent, dark green and shining above, pale and black-dotted beneath, glabrous, 

 obovate or oval, obtuse or rounded at the apex, 5-15 mm. long, with revolute 

 margins; corolla campanulate, about 4 mm. long, 4-lobed; stamens 8; berry 8-10 

 mm. in diameter, red. Vaccinium Vitis-Idaea L. Rocky places and open woods: 

 Greenl. Mass. Alta. Alaska; Eurasia. Je-Jl. 



5. OXYCOCCUS (Tourn.) Hill. CRANBERRY. 



Delicate trailing or creeping vines. Leaves alternate, persistent, entire, 

 leathery, with more or less revolute margins. Flowers solitary or few together, 

 on slender pedicels. Sepals 4. Petals 4, pink or red, distinct, narrow, and re- 

 curved. Stamens 8; anther-sacs produced into slender tubes, opening with 

 terminal pores. Ovary and fruit 4-celled. Fruit globose or ellipsoid, red, sour. 



Leaves ovate or lanceolate, 4-8 mm. long; fruit globose; bracts subulate or filiform. 



Leaves strongly revolute, acute; fruit 6-9 mm. in diameter; flowers strictly terminal. 



1. O. Oxycoccus. 

 Leaves not revolute, mostly obtusish; fruit 10-12 mm. in diameter; flowers often 



surpassed by a leafy shoot. 2. O. intermedius. 



Leaves elliptic or oblong, obtuse, 6-14 mm. long; flowers mostly lateral; bractlets 

 lanceolate or oblong, foliaceous; fruit rounded-ellipsoid. 3. O. macrocarpus. 



1. O. Oxycoccus (L.) MacM. Stems slender, creeping'and rooting, 1-4 dm. 

 long; leaves thick, rounded or cordate at the base, dark green above, white beneath, 

 4-6 mm. long; flowers in small umbel-like corymbs from scaly terminal buds; 

 petals oblong, 5-7 mm. long; berry globose, 6-9 mm. in diameter, usually spotted. 

 Vaccinium Oxycoccus L. Oxycoccus palustris Pers. Cold bogs: Greenl. N.J. 

 Mich. Wash. Alaska. Boreal Subarctic. My-Jl. 



2. O. intermedius (A. Gray) Rydb. Stems coarser than in the preceding, 

 3-6 dm. long; leaves thick, broadly ovate or oval, rounded or cordate at the base, 

 green above, white beneath, slightly revolute, 8-12 mm. long; berry globose, 10- 

 12 mm. in diameter. V. Oxycoccus intermedius A. Gray. In bogs: Alaska- 

 Wash. Ida.; e Asia. My-Je. 



3. O. macrocarpus (Ait.) Pers. Stems 3-10 dm. long; leaves oblong- 

 elliptic, usually rounded at both ends, 8-15 mm. long, green above, pale beneath, 

 slightly revolute; inflorescence racemose from a terminal bud, nearly always pro- 

 duced into a leafy branch; berry nearly always longer than broad, 10-18 mm. 

 in length, not spotted. Bogs: Newf. N.C. Minn. Sask. Boreal. Je-Au. 



FAMILY 100. PRIMULACEAE. PRIMROSE FAMILY. 



Caulescent or scapose herbs. Leaves opposite, alternate, or whorled, 

 without stipules. Flowers perfect, in ours regular. Sepals 4-9, partially 

 united. Corolla hypogynous, usually gamopetalous, or rarely wanting; 

 lobes 4-9. Stamens as many as the calyx-lobes and alternate with them, 

 partly adnate to the corolla-tube or the calyx; filaments sometimes united 

 at the base. Pistil single; ovary free or nearly so, 1 -celled, with a central 

 placenta. Fruit a 1-celled capsule, opening by 2-8 valves. 



Ovary wholly superior and free. 

 Corolla present. 



Corolla-lobes erect or spreading; stamens distinct, except in Lysimachia. 



Corolla salverform or funnelform, its lobes imbricate; stamens included; 

 plants scapose; leaves in rosettes, either on the basal crown or at the 

 ends of short branches of the caudex. 

 Corolla-tube equalling or exceeding the calyx; style filiform. 



Truly scapose perennials, simple, bearing a single tuft of leaves on the 



short crown; seeds numerous. 1. PRIMULA. 



Low suffruticose perennials; leaves rosulate or imbricate at the ends 



of the branches of the caudex; seeds few. 2. DOUGLASIA. 



Corolla-tube shorter than the calyx, its throat constricted; style very short. 

 Cespitose, rosulate perennials; capsule few-seeded. 3. DROSACE. 



