. British plants; their biology and ecology. Botany; Botany; Plant ecology. 180 BRITISH PLANTS the flowers, which are small, are clustered into head-like racemes. The spike (Fig. 77) and its variety, the catkin, are repre- sented chiefly by wind-pollinated plants—, plantain, hazel, alder, birch. Some grasses possess compound spikes. The orchids have stalkless flowers on an elongated axis, and, morphologically, these inflorescences are spikes; but the usually long inferior ovary behaves as a stalk. ^ il ^ ^ ^ ^ 2. Fio. 77.—^Diagram of Sfiee. Fio. 78.—^Wiixow-hbrb : LoNGiruriNAL Sectiok of F
. British plants; their biology and ecology. Botany; Botany; Plant ecology. 180 BRITISH PLANTS the flowers, which are small, are clustered into head-like racemes. The spike (Fig. 77) and its variety, the catkin, are repre- sented chiefly by wind-pollinated plants—, plantain, hazel, alder, birch. Some grasses possess compound spikes. The orchids have stalkless flowers on an elongated axis, and, morphologically, these inflorescences are spikes; but the usually long inferior ovary behaves as a stalk. ^ il ^ ^ ^ ^ 2. Fio. 77.—^Diagram of Sfiee. Fio. 78.—^Wiixow-hbrb : LoNGiruriNAL Sectiok of Floweb showing Long, Stalk-like IsrEKiOR Ovary (a). Btyle; e, stigmas; d, stamens; e, petals; /, sepals. 6. 80 that the flowers stand away from the axis, and biologically the inflorescence is a raceme. The same is true of the evening-primrose and some wUlowherbs (Fig. 78). The cyme (Fig. 79) is found in the Pink family and the valerians. The main axis ends in a flower, and one or two branches arise immediately below, which in their turn end in flowers. This method of branching continues until a large usually flat-topped inflorescence is 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 Bevis, James Frederick; Jeffery, Henry John. London, Methuen
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
