. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. 136 KLEMENTS OF STIUJCTURAL RoTANY. The cells of anthers commonly open along their ontcr (!(lges to discharge their pollen (Fig. 185). In most of the Heaths, however, the i)ollen is discharged through a niinnte apertnre at tlu; top of each cell (Fig. 186), and in our Blue Cohosh each cell is provided with a lid or valve near the top, which opens on a kind of hinge (Fig. 187). Occasionally, examp
. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. 136 KLEMENTS OF STIUJCTURAL RoTANY. The cells of anthers commonly open along their ontcr (!(lges to discharge their pollen (Fig. 185). In most of the Heaths, however, the i)ollen is discharged through a niinnte apertnre at tlu; top of each cell (Fig. 186), and in our Blue Cohosh each cell is provided with a lid or valve near the top, which opens on a kind of hinge (Fig. 187). Occasionally, examples of barren or abortive stamens are met with, as the fifth stamen in Turtle Head and Pentstemon. These are lilaments without anthers, and are known as stcmniodss. 212. Stamens may be either entirely distinct from each other—in which ciso they are described as diandrous, 'pcnta7i(lroiis, odaiidroiis, &c., according to their number (or, if more than twenty, as indefinite)—or they may be united in various ways. If their anthers are united in a circle, while the filaments are separate (Fig. .57), they are said to be sunaencsiuiis: but if the filaments unite to form a tube, while the Figs. 18:3. 1S7. 18G. anthers remain distinct, they are said to be mpnadelpJwus (Fig. 32); if they are in two groups the;y are diadelphous (Fig. 37); if in three, triadelphous ; if in more than three, poh/adclpJiotis. 213. As to insertion, when stamens are inserted on the receptacle they are huporjjpious; when borne on the calyx, pGfi^Jinousj when borne on the ovary, eing^nous ; and if inserted on the corolla, epipetalojis. They may, however, be borne even on the st^le, as in Orchis, and then they are described as gynandrous. 214. If the stamens are four in number, and in two. Figs. 185,186,187.—Anthers exhibiting iMfferent modes of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearan
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