X Key to the Families Eased Mainly Cpon Floweks. 



e"- Caljx consisting of five sepals ; stamens 



h. Eight bnt four imperfect ; flowers in antumn. 



Hamamelis, in Hamelidacese (p. 436). 

 h" Numerous : pistil solitary and 

 i Single-celled : fruit a drupe. 



Prunus, in Rosacese (p. 440 1. 

 i^ Five-celled : leaves deciduous ; fiuit 



j Indehiscent, a dry nut like (Irupe attaclicd to a seed-leaf which serves 



as a parachute Tiliaceae ( p. 44.S i . 



j- Dehiscent, 5-valved capsule; leaves persisient. 



Gordonia, in Theaceae ( ii. 44!) ) . 

 g^ Calyx 4-5-lobed ; stamens as many as the iiet;ils and 



Alternate with the petals which are widely spicadini;. 



Euonymous, in Celastraceae (p. 446). 

 Opposite the petals which are hood-like and envelupe them. 



Rhaninus, in Rhaninacese (p. 448). 

 f- Irregular 



g Leaves pinnately compound or biconipovnid ; I'luit a legume. 



Leguminosse (p. 441). 

 g- Leaves palmately compound; capsule with larue nut-like seeds: some flowers 



unisexual by abortion Hippocastanacese (p. 447 j. 



e^ Flowers polygamous ; fruit a 

 f Samara 



g Winged all around Ptelea, in Riitacese (p. 444). 



g^ With long oblique wing and borne in pairs. 



Acerace^ ( i). 446 ) . 

 £■ Capsule containing a solitary seed ; leaves pinnate. 



Xanthoxyluni, in Rutacese (p. 443). 

 f Drupe in terminal open thyrses. 



Sapindus, in Sapindacese (p. 447). 

 e' Unisexual 



f Mostly dicecious and occasionally pei'fect ; fruit a 



g Samara; leaves pinnate.... Ailanthus, in Siniarubacese (p. 444). 

 g- Small dryish drupes in terminal thyrses or axillary pani(les. 



Anacardiacese (p. 444). 

 g^ Larger berry-like drupes in small axillary clusters or solitary. 

 Ilicacese ( p. 44."t I . 

 f- Monoecious, in dense globose heads; leaves alternate, simple and palmatel.v 



veined ; fruit an akene Platanacese (p. 437) . 



d' Ovary inferior; fruit 

 e Drupaceous ; leaves 



Twice pinnate; styles and cells of ovary 4-5. 



Araliacese (p. 4.")0). 



Simple; styles solitary Cornacese (p. 4."()). 



e' A pome. .Pyrus, Sorbus, Crataegus and Amelanchier, in Rosacese (p. 438). 

 c' United petals 



d Ovary superior; flowers perfect; fruit a 

 e Capsule with 



f Five cells and five valves. 



Rhododendron, Kalniia and Oxydendruni, in Ericaceae (]). 451). 

 F Two cells septicidally dehiscent : flowers Idue. 



Paulownia, in Scrophulariacese (p. 457). 

 e' Berry subtended by accrescent calyx. 



Diosperus, in Ebenaceae (p.. 453). 

 e' Fleshy drupes in 



f Axillary fascicles Biinielia, in Sapotaceae (p. 4.52). 



f= Loose terminal panicles Chionanthus, in Oleacese (p.. 455). 



e* Dryish drupe ; leaves simple and 



f Alternate; flowers in crowded axillary clusters. 



Syniplocaceae (p. 45.3). 



f- Opposite; drupe 4-winged Styraceae (p. 454). 



e' Pod-like capsule; flowers bilabiate in ((uisiiicuous terminal panicles. 



Catalpa, in Bignoniaceae ( i). 456 ) . 

 d' Ovary inferior; flowers perfect; corolla 



e Campanulate; stamens 10; anther cells opening by a terminal pore: fruit a berry. 



Vacciniuin, in Ericaceae (p. 452). 

 e- Rotate; flowers in compound corymbs: fruit a blue (lru|ie with flattened pit. 



Viburnum, in Caprifoliaceae (p. 451). 

 e' Tubular-funnelform ; flowers in globose heads; leaves opposite or in whorls of 3. 



Cephalanthus, in Rubiaceae (p. 456). 



