X Key to the Families Based Mainly Upon Floweks. 



g- Calyx consisting of five sepals ; stamens 



h. Eight but four imperfect : flowers in autumn. 



Hamamelis, in Hamelidacese (p. 436). 

 li- Numerous: pistil solitary and 

 i Single-celled ; fruit a drupe. 



Prunus, in Rosacese (p. 440). 

 i- Five-celled ; leaves deciduous ; fruit 



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



as a parachute Tiliacese (p. 44S). 



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



Gordonia, in Theacese (p. 449). 

 g^ Calyx 4-5-lobed ; 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 Rhamnacese (p. 448). 

 f- Irregular 



g Leaves pinnately compound or l)i(on)])ound ; fruit a legume. 



Lieguminosse (p. 441). 

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



unisexual by abortion Hippocastanacese (p. 447). 



e- Flowers polygamous ; fruit a 

 f Samara 



g \Yiuged all around Ptelea, in Rutacese (p. 444). 



g^ With long oblique wing and borne in pairs. 



Aceraceae ( p. 446 ) . 

 £• Capsule containing a solitary seed ; leaves pinnate. 



Xantlioxylum, in Rutacese (p. 443). 

 f 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. 

 Ilicacese ( p. 44.") ) . 

 f- Monoecious, in dense globose heads; leaves alternate, simple and palmately 



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



d* Ovary inferior ; fruit 

 e Drupaceous ; leaves 



Twice pinnate; styles and cells of ovary 4-."). 



Araliacese (p. 4r)0). 



Simple; styles solitary Cornaceae (p. 4.^0). 



e' A pome. .Pyrus, Sorbus, Crataegiis 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, Kalmia and Oxydendrum, in Ericaceae (p. 451). 

 F Two cells septicidally dehiscent ; flowers blue. 



Faulownia, in Scrophulariacese (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 1 . 



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



e* Dryish drupe ; leaves simple and 



f Alternate ; flowers in crowded axillary clusters. 



Symplocaceae ( i). 4.53 ) . 



f- Opposite ; drupe 4-winged Styraeeae ( p. 4.54 ) . 



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



Catalpa, in Bignoniaceae (p. 456). 

 d' Ovary inferior ; flowers perfect ; corolla 



e Campanulate ; stamens 10; anther cells o])ening by a tei'minal pore; fruit a berry, 



Vaccinium, in Ericaceae (p. 452). 

 e= I'otate : flowers in compound corymbs: fruit a blue diu])*- with flattened pit. 



Viburnum, in Caprif oliaceae ( p. 451 ) . 

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



Cephalanthus, in Rubiacese (p. 456). 



