424 THE STORY OF PLANT LIFE 



seeds; seed small, exalbuminous, with basal tuft of 

 hairs. 



Family. Salicaceae (Vol. Ill, p. 259). — Plants 

 dioecious, bracts simple ; perianth wanting ; stamens 2 or 

 more ; ovary superior, i-locular ; ovules numerous, parietal ; 

 fruit a capsule. 



Genera. Populus (Vol. Ill, p. 261), Salix (Intro- 

 ductory Vol., p. 192). 



Order 2. Myricales. — Flowers achlamydeous ; 

 plants monoecious or dioecious; flowers with brac- 

 teoles at the base ; stamens 4 as a rule ; carpels (2) ; 

 ovary i-locular; ovule i, orthotropous ; styles 2; 

 fruit a drupe. 



Family. Myricaceae (Vol. Ill, p. 250). — Flowers 

 unisexual, in short erect catkins; bracts overlapping; perianth 

 wanting; stamens 2-16; ovary i-locular; ovule i, erect. 

 Genus. Myrka(Yo\. Ill, p. 251). 



Order 4. Fagales. — Flowers cyclic, in simple 

 or compound spikes, homochlamydeous, rarely 

 naked, generally unisexual ; plants monoecious ; 

 stamens often anteposed to perianth-leaves ; carpels 

 (2-6), each with 1-2 ovules; gynoecium superior; 

 fruit usually nut-like, i -seeded; no endosperm. 



Family i. Betulacese. — Flowers before leaves; peri- 

 anth present in flowers of only one sex ; male catkins com- 

 pound, united to bracts; stamens 2-10; carpels (2); styles 2. 

 Tribe i. CorvlecB. 



Genera. Carpinus^ Corylus(yo\. Ill, p. 255). 

 Tribe 2. Betulece. 



Genera. Betula (Introductory Vol., p. 195), 

 ^/««.j (Introductory Vol., p. 189). 



