500 PHARMACEUTICAL BOTANY 
Leaves alternate, simple, entire, stipulate; stipules rarely 
green, persistent, usually functioning as winter bud-scales and 
falling in spring. 
Inflorescences dicecious spikes, so on separate plants. Stami- 
nate spikes forming deciduous catkins of yellowish flowers, 
pistillate as persistent spikes of green flowers, at length maturing 
fruit. 
Flowers of catkins numerous, each of two to five (Willow) or 
six to fifteen (Poplar); stamens in axil ofa small bract leaf, 
sometimes with small nectar knob or girdle at base; pollen 
abundant, hence plants anemophilous, rarely entomophilous. 
Pistillate flowers green, each of a bicarpellate pistil in axil of 
bract, ovary one-celled with parietal placentation, style simple, 
stigma bilobed. 
Fruit a capsule dehiscing longitudinally. Seeds small, exal- 
buminous, surrounded by a tuft of hairs for dissemination. 
OrrFiciAL DruG Part UsEep BoTANnicAL NAME HasitTAtT 
Salicinum _ Glucoside Several species of Europe, North 
Salix and Populus America 
Populus 
Populi Gemma Closed winter leaf rat North America 
bud Populus candicans- 
UnorriciAL Druc 
Salix Bark Salix alba Europe 
Salix Nigra Bark Salix nigra North America 
Poplar bark Bark Populus tremuloides North America 
ORDER MyRICALES 
Myricack& OR BAYBERRY FamiLy.—Dicecious or sometimes 
moncecious, aromatic shrubs or trees with watery juice and 
possessing underground branches which arch downward then 
upward producing many suckers. Roots fibrous and bearing 
many short rootlets upon which are frequently found coralloid 
clusters of tubercles containing the Actinomyces Myricarum 
Youngken. Leaves alternate, revolute in vernation, serrate, 
irregularly dentate, lobed or entire, rarely pinnatifid, pinnately 
and reticulately veined, pellucid-punctate, evergreen or decidu- 
ous, generally exstipulate, rarely stipulate. Flowers naked, 
unisexual, monoecious or dicecious, in the axils of unisexual or 
