. Botany for high schools. Botany. FLOWERS, THEIR STRUCTURE AND KINDS 145 The Evening Primrose. {(Enothera biennis = Onagra biennis.) 234. The flowers of the evening primrose are formed in a rather loose spike, which continues to grow at the end, producing new flowers in the axils of the bracts, while the seed is ripening in the lower older fruit pods. In vigorous plants flower spikes are also formed on the branches in the axils of the upper leaves. 335. The calyx forms a long tube, the lowxr part of which is joined to (adnate) the outside of the ovary. This tube is pro- longed far above the a
. Botany for high schools. Botany. FLOWERS, THEIR STRUCTURE AND KINDS 145 The Evening Primrose. {(Enothera biennis = Onagra biennis.) 234. The flowers of the evening primrose are formed in a rather loose spike, which continues to grow at the end, producing new flowers in the axils of the bracts, while the seed is ripening in the lower older fruit pods. In vigorous plants flower spikes are also formed on the branches in the axils of the upper leaves. 335. The calyx forms a long tube, the lowxr part of which is joined to (adnate) the outside of the ovary. This tube is pro- longed far above the apex of the ovary and is about twice the length of the young ovary. The . free part of the tube is easily distinguished from the part adnate with the ovary by its light green color. The calyx lobes are four in number, long, narrowly acu- minate, and in the flower bud the edges fit closely, giving the bud an elongate, four-angled, pointed form. These calyx lobes are the free parts of the sepals, the edges of which are united below to form the tube. As the flower opens the calyx lobes part, and become inverted, hanging downward from the apex of the tube. 236. The corolla is bright yel- low and consists of four petals which are inserted on the edge of the calyx tube. Each petal is broadly wedge-shaped and notched in the free end, or rather it is heart- shaped. The petals are convolute in the bud, as shown in fig. io8, where they are just unfolding. 237. The stamens are eight in number, seated also on the edge of the calyx tube and partly on the base of the petals since. Fig. io6. Flower of evening primrose (Oi^. bien- nis) with corolla tube split open to show the long Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
