KEY, BASED UPON FLOWEES. 



,.*..* .*> ".imbricated in the bud, persistent; stamens at the base of petals 

 (Temstrcemiacece); calyx simple; stamens 5-adelphous (Gor- 

 donia); leaves coriaceous, evergreen. . .102. G. LASIANTHUS. 



7i 2 . Compound (Meliacece) 105. MELTA AZEDARACH. 



d? Calyx superior adnate to the ovary or at least its lower half; ovules 

 e. More than one in each cell; ovary 



f. 1-celled, 2-ovuled; flowers dioecious 131. GARRYA ELLIPTICA. 



/ 2 . 2-5-celled; fruit a 



g. Pome with 2-5 papery carpels (Pyrus)\ leaves 

 h. Simple and styles 

 i. United below; leaves 



Serrate (not lobed), downy 30. P. MALUS. 



Incisely serrate and sublobate, smooth 83. P. CORONARIA. 



i 2 . Distinct 57. P. COMMUNIS. 



h*. Pinnately compound. . . .84. P. SAMBUCIFOLIA. 



gr 2 . Pome drupe-like with 1-5 bony seeds (Cratcegus); leaves 



fi. Villous, cuniform, obovate 58. C. PUNCTATA. 



7i 2 . Glabrous, abrupt at base 86. C. COCCTNEA. 



attenuate at base 85. C. CRUS-GALLI. 



/ 2 . Ovary 10-celled 59. AMELANCHIER CANADENSIS. 



e 2 . Only one in each cell; stamens 4; styles and stigmas 1 (Cornacece); cymes 



Subtended by a 4-leaved involucre 88. CORNUS FLORIDA. 



Naked, leaves alternate ... .87. CORNUS ALTERNIFOLIA. 



C 8 . Stamens few, opposite the petals and of the same number; pistil one, with 

 2-4-celled ovary; sepals 



Obsolete; petals valvate ( Vitacew} 78. VITIS JESTIVALIS. 



Present and valvate (Rhamnacece); fruit drupe-like berry with 2-5 nutlets 



(Rhamnus) convex on back; leaves deciduous 126. R. PURSHIANA. 



C 8 . Stamens few, not more than 10, alternate with the petals when of the same 



number. 



d. Calyx inferior free from the ovary. 

 e. Ovaries 2-5, separate; styles 



Terminal and conniving 106. XANTHOXTLUM CLAVA-HERCULIS. 



Lateral and distinct 4. AIL ANT H us GLANDULOSUS. 



e 9 . Ovary single, but compound as shown by the cells, styles or stigmas. 

 f. One-celled and one-seeded; styles or stigmas three; shrubs or trees 

 with regular flowers (Anacardiacece) ; leaves compound with 11-31 

 oblong-lanceolate acuminate leaflets; common petiole densely villous 



and not winged; flowers in terminal thyrses 5 RHUS TYPHINA. 



f*. Two to several-celled and flowers 

 g. Irregular (Aesculus); fruit 



Prickly 6. AE. HIPPOCASTANUM. 



Smooth 127. AE. CALIFORNICA. 



gr 2 . Regular, stamens as many as the petals; trees with leaves 



h. 3-foliate 77. PTELEA TRIFOLIATA. 



7i, 2 . Simple, persistent or subpersistent. 



Stamens 5 107. CYRILLA RACEMIFLORA. 



Stamens 4; fruit berry-like 52. ILEX OPACA. 



Stamens 10; leaves simple, evergreen. 



108. CLIFTONIA LIGUSTRINA. 



