GENERA OR FAMILIES. 37 



34. Elaeagnaceous Plants. EL^AGNACE.E. 



(77) Hippophae perianth of male flowers with two small seg- 



ments and four stamens, of the females tubular, minutely 

 two-lobed. 



35. Euphorbiaceous Plants. EUPHORBIACE^E. 



(78) Buxus perianth small, of four segments, in the male flow- 



ers with four stamens, in the females with three styles. 



36. Empetraceous Plants. EMPETRACE^:. 



(79) Empetrum perianth of six scales, in two rows, with ex- 



ternal imbricating similar bracts, the males with three 

 stamens, the females with six or more radiating stigmas 

 on a very short style. 



37. Amentaceous Plants. AMENTACE^:. 



* Scales of the male catkins broad, imbricated; anthers 

 longer than their filaments. 



t Male and female catkins short, sessile, erect. 



(SO) Myrica male catkins with spreading concave shining scales, 

 the female ones shorter, with long protruding styles. 



ft Male catkins cylindrical, usually pendulous. 



(81) Alnus flowers three distinct with four stamens under 



each scale of male catkins ; female catkins small, ovoid. 



(82) Betula no distinct flowers ; stamens six to twelve under 



each scale ; female catkins short, cylindrical. 



** Scales of the male catkins narrow-linear or divided ; an- 

 thers small, on slender filaments. 



(83) Salix male and female catkins cylindrical, compact, the 



scales entire ; stamens two, rarely three to five, with one 

 or two gland-like inner scales. 



