2 KEY, BASED UPON FLOWERS. 



.' d-, Calyx superior adnate to the ovary or at least its lower half; ovules 

 e. More* than one in each cell; ovary 



/. 1-ceHed, 2-ovuled; flowers dioecious 131. GARRYA ELLIPTICA. 



/'*. 2:5-celled ; fruit a 



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

 7t. 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. 



ft 2 . Pinnately compound 84. P. SAMBUCIFOLIA. 



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



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



ft 2 . Glabrous, abrupt at base 86. C. COCCINEA. 



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. CORNTJS FLORIDA, 



Naked, leaves alternate. 87. CORNUS ALTERNIFOLIA. 



C 5 . Stamens few, opposite the petals and of the same number; pistil one, 

 with 2-4- celled ovary; sepals 



Obsolete; petals valvate (Vitacece) 78. VITIS .^STIVALIS. 



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

 lets; calyx and disk 

 Free from the t> vary (Rhamnus); leaves deciduous. .126. E. PURSHIANA. 



Adnate to base of ovary (Clanothus) 151. C. THYRSIFLORUS. 



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. XANTHOXYLUM CLAVA-HERCULIS. 



Lateral and distinct 4. AILANTHUS GLANDULOSIS. 



e 2 . Ovary single, but compound as shown by the cells, styles and stigmas. 



/. 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 petioles densely 



villous and not winged; flowers in terminal thyrses. 



* 5. RHUS TYPHINA. 

 / 2 . Two to several-celled and flowers 

 g. Irregular (Aesculus); fruit 



Prickly 6. AE. HIPPOCASTANUM. 



Smooth 127. AE. CALIFORNICA. 



gr 2 . Regular, stamens. 

 h. As many as the petals ; trees with 



i. Leaves, 3-foliate 77. PTELEA TRIFOLIATA. 



i 2 . Leaves, 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. 



h 2 . From 2-5 more than the petals (Acer) flowers appearing. 

 i. Before the leaves in short umbels ; young fruit smooth, 



i*. After the leaves, in drooping racemes 53. A. RUBRUM. 



Ovary and young fruit 



Glabrous , 79. A. PENNSYLVANICUM. 



Hairy 152. MACROPHYLLUM. 



e 3 . Ovary single and simple, with one parietal placenta (Leguminosce) ; 



corolla 

 /. Papilionaceous ; stamens 



Distinct 80. ROBINIA PSEUDACACIA. 



Monadolphons : leaves glandular- dotted 154. DALEA SPINOSA. 



f^. Snbrpgular nnd imbricated in aestivation ; flowers 



g. Perfect (Circidium) 128. C. TORREYANUM. 



