GENEKA OR FAMILIES. 37 



34. ElsBagnaceous Plants. El^agnace^. 



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



ments and four stamens, of the females tubular, minutely 

 two-lobed. 



35. Euphorbiaceous plants. Euphorbiace^. 



(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 hroad, 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. 



tt 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 narroiu-linear or divided ; an- 

 thers small, on slender filaments. 



(83) Salix — male and feuiale catkins cylindrical, compact, the 



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

 or two gland-like inner scales. 



