SECT. II 



PHANEROGAMIA 



495 



To the genus Populus belong, among others, the White Poplar (P. alba), the 

 Black Poplar (P. nigra), the Aspen (P. tremula), all natives of Europe, and the 

 Lombardy Poplar (P. pyramidalis), originally indigenous to the East. 



Officinal. — Salix alba and other species yield Cortex salicis. 



Family Cupuliferae. — Flowers epigynous, monoecious, with or 

 without perigone ; disc absent ; ovary two- to three- locular, with 



Fig. 442. — Quercus pedwimi,lata. A, Flowering branch; B, a male flower (magnified); C, stamens 

 (magnified); D, e, female flower (magnified); E, infructescence ; F, cupule ; G-H, seed.— 

 Officinal. 



one to two suspended ovules in each loculus ; fruit, a one-seeded 

 nut. Woody plants with simple, stipulate leaves ; female inflorescences 

 of different types (Figs. 441-447). 



The Cupuliferae are deciduous, or, in the warmer zones, evergreen 

 woody plants, with variously shaped, usually toothed or lobed leaves. 



These flowers are small and inconspicuous ; they are adapted to 

 wind-pollination, and are accordingly destitute of any special means of 



