KEY, BASED UPON FLOWEKS. 



;'*." " C .\ Imbricated in the bud, persistent; stamens at the base of petals 



*l: , .;.''*. -.(Temstr&miacece); calyx simple; stamens 5-adelphous (Gor- 



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



h*. Compound (MeliaceoB) 105. MELIA AZEDARACH. 



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

 e. More than one in each cell; ovary 

 /. 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 (Cratvegus); leaves 



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



h?. 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. 



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 yESTIVALIS. 



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 GLANDTJLOSUS. 



C 8 , 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-lanceolate acuminate leaflets; common petiole densely villous 



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



f* 9 Two to several-celled and flowers 



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



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



h. 3-foliate 77. PTELEA TRIFOLIATA. 



h? Simple, persistent or subpersistent. 



Stamens 5 107. CYRILLA RACEMIFLORA. 



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



Stamens 10; leaves simple, evergreen. 



108. CLIFTONIA LIGUSTRINA. 

 e z . Ovary single and simple, with one parital placenta (Leguminosm) ; corolla 



/. Papilionaceous ; stamens distinct 80. ROBINIA PSEUDACACIA. 



f*. Subregular and imbricated in aestivation. 

 g* Flowers dioecious; stamens 10; tree unarmed. 



27. GYMNOCLADUS CANADENSIS. 



