" '. : '\ % -. / : : -2 : ; -^EY, BASED UPON FLOWERS. 



: .; ; -*;: * - &* United below; leaves 



* ~ .'"r . * " ; : M J . % .' Serrate (not lobed), downy 30. P. MALUS. 



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



i*. Distinct 57. P. COMMUNIS. 



h~. Pinnately compound . , .84. P. SAMBUCIFOLIA. 



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



Villous, cuuiforni, obovate 58. C. PUNCTATA. 



Glabrous, abrupt at base 86. C. COCCINEA. 



attenuate at base 85. C. CRUS-GALLI. 



f-. Ovary 10-celled 59. AMELANCHIES 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 2 . Stamens few, opposite the petals and of the same number; pistil one, with 

 2-4-celled ovary; calyx lobes obsolete; petals valvate (Vitacece). 



78. VlTIS ^ESTIVALIS. 



c 3 . Stamens few, not more than 10, alternate with the petals when of the same 



number. 

 cl. Calyx inferior free from the ovary. 



e. Ovaries 2-5, separate ; stamens distinct and inserted on the receptacle; 

 trees with pinnately compound and uniformity opaque leaves. 



4. AlLANTHUS GLANDULOSUS. 



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

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

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

 oblong lancolate acuminate leaflets; common petiole densely villous 



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



f*. Two-several-celled and flowers 



g. Irregular (Aesculus) 6. AE. HIPPOCASTANUM. 



gr 2 . Regular, stamens as many as the petals; trees with leaves 3- foliate 



pelucid punctate 77. PTELEA TRIFOLIATA. 



Simple pinnately veined calyz minute, fruit berry-like. 



52. ILEX OPACA. 

 e 3 . Ovary single and simple, with one parital placenta (Leguminoste); corolla. 



/. Papilionaceous ; stamens distinct 80. ROBINIA PSEUDACACIA. 



f" 1 , Subregular and imbucated in aestivation. 



Flowers dioecious; stamens 10; tree unarmed. 



* 27. GYMNOCLADUS CANADENSIS. 



Flowers polygamous; stamens 5; tree armed with thorns (Gleditscliia) 



which are triple and pods linear 28. G. TRIACANTHOS. 



(I 2 . Calyx superior adnate to the ovary; flowers in umbels; stamens 5; 

 styles 5; fruit drupe-like with 5 cells each with a single ovule (Aralia); 



arborescent and armed with prickles 8. ARALIA SPINOSA. 



ft 2 . Gramopetalous petals present and united; stamens. 



C. As many as the lobes of the corolla and alternate with them or fewer; ovary 

 superior; corolla irregular; ovary 2-celled (Bignoniacew) pod terete; leaves 



simple (Catcdpa) 89. C. BIGNONIODES. 



c 2 . 2-4-times as many as the lobes of the corrolla inserted on its base and fila- 

 ments distinct (Ebenacew) 61. DIOSPYROS VIRGINIANA. 



