12 ANALYTICAL KEY 



f. Calyx and corolla both present. 

 g. Corolla sympetalous (Heath family). 

 h. Flowers hypogynous (Rhododendron). 

 i. Flowers pink, appearing before the leaves, not clammy pubescent. 



PURPLE AZALEA, RHODODENDRON NUDIFLORUM (p. 102). 

 i. Flowers white, appearing after the leaves, clammy pubescent. 



SWAMP HONEYSUCKLE, RHODODENDRON VISCOSUM (p. 101). 

 h. Flowers epigynous. 



i. Flowers reddish; bark brownish or reddish, not warty; leaves resinous. 



HUCKLEBERRY, GAYLUSSACIA BACCATA (p. 103). 



i. Flowers whitish to greenish; bark warty; leaves not resinous 



(Blueberry). 

 j. Bog shrubs, over one. meter in height. 



SWAMP BLUEBERRY, VACCINIUM CORYMBOSUM (p. 104). 

 j. Upland shrubs, less than one meter in height. 



k. Stems dwarf (26 dm.), green, spreading; leaves serrulate with 

 bristle-pointed teeth, bright green. 



Low BLUEBERRY, VACCINIUM PENNSYLVANICUM (p. 104). 

 k. Stems low (39 dm.), yellowish green, erect; leaves pale at least 

 beneath, entire or nearly so. VACCINIUM VACILLANS (p. 104). 

 g. Corolla polypetalous. 



h. Plants armed with spines, prickles, or bristles (p. 13). 

 i. Leaves compound (p. 13). 



j. Petals and stamens six. BARBERRY, BERBERIS VULGARIS (p. 67). 

 j. Petals five; stamens numerous (Rosaceae). 

 k. Pistils freely exposed (Rubus). 

 1. Erect or arched-ascending shrubs. 



m. Stems angular, armed with stout prickles; bristles wanting; 



leaves palmately 35. foliolate; flowers large (25 cm. or more 



in width). TALL BLACKBERRY, RUBUS ALLEGHENIENSIS (p. 81). 



m. Stems round, armed with bristles; leaves pinnately 35 foliolate; 



flowers small (2.5 cm. or less in width). 



n. Stems erect, slightly if at all glaucous, densely bristle- 

 covered; petals as long as the sepals. 



RED RASPBERRY, RUBUS IDAEUS ACULEATISSIMUS (p. 80). 

 n. Stems recurved, rooting at the tips, conspicuously glaucous; 

 petals shorter than the sepals. 



BLACK RASPBERRY, RUBUS OCCIDENTALS (p. 81). 

 1. Trailing shrubs. 



m. Leaves leathery, shiny, tending to be evergreen; flowers 2 cm. 

 or less in width. RUBUS HISPIDUS (p. 81). 



m. Leaves not leathery nor shiny, strictly deciduous; flowers 2 cm. 

 or more in width. DEWBERRY, RUBUS VILLOSUS (p. 81). 



k. Pistils enclosed in the fleshy calyx tube (Rose). 

 1. Pedicels and receptacles naked; sepals connivent after flowering, 

 persistent; true prickles wanting; bristles present. 



WILD ROSE, ROSA BLANDA (p. 79). 

 1. Pedicels and receptacles hispid; sepals spreading after flowering, 



deciduous; prickles regularly present. 

 m, Swamp shrubs with serrulate leaves; stipules narrowly linear. 



SWAMP ROSE, ROSA CAROLINA (p. 79). 



m. Upland shrubs with coarsely serrate leaves; stipules oblanceolate. 

 PASTURE ROSE, ROSA HUMILIS (p. 79). 



