26 General Key to the Families 



membranaceous bracts; fruit nut-like, compressed, seeds pendu- 

 lous. 



I. Callitriche, L. 



I. C. palustris. L. Water Fennel. 



ORDER XXIII. SAPINDALES 

 XLII. EMPETRACE^. CROWBERRY FAMILY 



Low evergreen shrubs with the foliage aspect and compound 

 pollen of Heaths and drupaceous fruit. Probably just an apetalous 

 and degenerate form of Ericaceae and comprising three genera, 

 only one of which is found within the limits of this book. 



I. Empetrum. (Tourn.) L. 



I. E. nigrum. L. Crowherry. 



XLIII. CELASTRACE^. STAFF TREE FAMILY 



Shrubs and shrubby climbers or trees; leaves simple, evergreen; 

 flowers perfect, regular, small, the petals as many as the sepals 

 and alternate with them; fruit free from the calyx, embryo large 

 in fleshy albumen, seeds arilled. 



I. Pachistima. Raf. 



I. P. Myrsinites. Raf. Mountain Lover. 



XLIV. ACERACE^. MAPLE FAMILY 



Trees or shrubs with watery often saccharine sap; leaves oppo- 

 site, simple, palmately lobed or more rarely pinnately divided; 

 flowers axillary, terminal, cymose or racemose, small, regular, 

 mostly polygamous or dioecious, sometimes apetalous; fruit two 

 long- winged samaras joined at the base. 



I. Acer. (Tourn.) L. 



I. A. glabrum. Torr. Dwarf Maple. 



XLV. HYPERICACE^. ST. JOHN'S-WORT FAMILY 



Herbs or shrubs; leaves opposite, entire, with black dots or 

 lines, mostly sessile, punctate with resinous glands, no stipules; 



