KEY, BASED UPON FLOWERS. 



h" 2 . Compound (Meliacece) 105. MELIA AZEDARACH. 



rf 9 . Calyx superior (adnate) to the ovary or at least its lower half; ovary 

 e. 1-celled and ovules 



Two in each cell; flowers dioecious 131. GARRY A ELLIPITICA. 



Many in each cell; flowers perfect 184. OPUXTIA TUNA. 



e-. 2-5-celled; fruit a 



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

 g. Simple and styles 

 h. United below; leaves 



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



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



7i 2 . Distinct 57. P. COMMUXIS. 



</-. Pinnately compound 84, P. SAMBUCIFOLIA. 



/-'. Pome drupe-like with 1-5 bony seeds (Cratcegus)-, leaves 



ff. Villous, cuniform, obovate 58. C. PUXCTATA. 



ff*. Glabrous, abrupt at base 86. C. COCCINEA. 



attenuate at base ... 85. C. CRUS-GALLI. 



e*. Ovary 10-celled 59. AMELANCHIER CAXADEXSIS. 



c 2 .Stamens of the same number as the petals and opposite them; pistil one, 

 with 2-4-celled ovary: calyx lobes 



d. Obsolete; petals valvate (Vitacece) .78. VITIS _ESTIVALIS. 



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



calyx and disk 

 e. Free from the ovary (Rhamnus)- leaves 



Deciduous; fruit black at maturity 126. R. PURSHIAXA 



Persistent; fruit red 176. R. IXSULARIS. 



e 2 . Adnate to the base of ovary (Ceanothus) ; branchlets conspicuously 



angled 151. C. THYRSIFLORUS. 



Slightly angled 177. C. ABOREUS. 



c 3 . 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 connivent 106. XANTHOXYLUM CLAVA-HERCULIS. 



Lateral and distinct 4. AILANTHUS GLAXDULOSUS. 



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

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

 regular flowers (Anacardiacece) stamens five (Rhus); leaves. 



g. Deciduous, compound with 11-31 leaflets 5. R. TYPHIXA. 



gr 2 . Persistent, mostly simple, thick ; fruit. 

 h. Viscid-pubescent 



2-3 lines long ; leaves acuminate 153. R. OVATA. 



5-6 lines long ; leaves rounded at apex 179. R. IXTEGRIFOLIA. 



7i 2 . Glabrous, small 180. R. LAURIXA. 



/ 2 . Two to several-celled and flowers. 

 g. Irregular (Aesculus) ; fruit 



Prickly 6. AE. HIPPOCASTAXUM. 



Smooth 127. AE. CALIFORXICA. 



gr 2 . Regular ; stamens 

 /i. 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. CLIFTOXIA LIGUSTRIXA. 

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

 i. Before leaves in short umbels ; young fruit smooth. . .58. A. RUBRUM. 

 i 2 . After the leaves, in drooping racemes. 

 Ovary and young fruit 



Glabrous 79. A. PEXXSYLVAXICUM. 



Hairy 152. A. MACROPHYLLUM. 



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

 corolla 



