X Kev to the Families Baskd Mainly Upon Floweks. 



g- Cal5'x (.-onsisting of five sepals; stamens 



h Eigbt but four imperfect; flowers in autumn. 



Hamaiuelis, in Hanielidacese (p. 436). 

 h'- Numerous : pistil solitary and 

 i Single-celled : fruit a drupe. 



Frunus, in Rosaceae (p. 44U). 

 i= Five-celled : leaves deciduous ; fruit 



j ludeliisceut, a dry nut-like drupe attached to a seed-leaf which serves 



as a parachute Tiliaceae (p. 448). 



j- Dehiscent, !5-valved capsule ; leaves persistent. 



Gordonia, in Theaceae (p. 449). 

 g" Calyx 4-.''>-Iobed ; stamens as many as the petals and 



Alternate with the petals which are widely spreading. 



Euonymous, in Celastracese (p. 446). 

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



Rhamnus, in Rhamnaceae (p. 448). 

 f- Iriegular 



g Leaves pinuately compound or bicompound ; fruit a legume. 



Lieguminosae (p. 441). 

 g- Leaves palmately compound; capsule with large nut-like seeds; some flowera 



unisexual by abortion Hippocastanacese (p. 447). 



e' Flowers polygamous ; fruit a 

 £ Samara 



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



s' With long oblique wing and borne in pairs. 



Aceraceae (p. 44ti). 

 f' Capsule containing a solitary seed ; leaves pinnate. 



Xaiithoxylum, in Rutaceae (p. 443). 

 t' Drupe in terminal open thyrses. 



Sapindus, in Sapindacese (p. 447). 

 e' Unisexual 



f Mostly dioecious and occasionally perfect ; fruit a 



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

 g' Small dryish drupes in terminal thyrses or axillary panicles. 



Anacardiaceae (p. 444). 

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



Ilicaceae ( p. 445 ) . 

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



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



d' Ovary inferior ; fruit 

 e Drupaceous ; leaves 



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



Araliaceae (p. 450 ) . 



Simple; styles solitary Cornacese (p. 4.5(t). 



e' A pome. .Pyrus, Sorbus, Crataegns and Amelanchier, in Rosaceae (p. 438). 

 c' United petals 



d Ovary superior; flowers perfect; fruit a 

 e Capsule with 



f Five cells and five valves. 



Rhododendron, Kalmia and Oxydendrum, in Ericaceae (p. 451). 

 f- Two cells septicidally dehiscent ; flowers blue. 



Paulownia, in Scrophulariaceae (p. 457) 

 e' Berry subtended by accrescent calyx. 



Diosperus, in Ebenaceae (p.. 453). 

 e' Fleshy drupes in 



f Axillary fascicles Bumelia, in Sapotaceae (p. 452). 



f= Loose terminal panicles Chionanthus, in Oleaceae (p.. 4.55). 



e* Dryish drupe; leaves simple and 



f Alternate; flowers in crowded axillary clusters. 



Symplocaceae (p. 453). 



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



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



Catalpa, in Bignoniaceae (p. 450). 

 d Ovary interior; flowers perfect; corolla 



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



Vaecinium, in Ericaceae (p 45') 

 e= Rotate; flowers in compound corymbs; fruit a blue diupe with flattened pit 



3 n K 1 f If fl • . i^'^iburnum, in Caprifoliaceae (p. 451). 



e' lubular-funnelform; flowers in globose heads; leaves opjiosite or in whorls of 3 



Cephalanthus, in Rubiaceae (p. 450). 



