. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 161. Indeterminate inflorescence is always axillary, since the production of a terminal flower would stop further growth in that direction and thus terminate the development of the axis. The raceme is the typical flower cluster of the indefinite sort. In such an arrangement the oldest flowers are at the lower nodes, new ones appear- ing only as the axis lengthens and pro- duces new internodes. The little scale or bract usually found at the base of the pedi- cel in flower c
. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. 161. Indeterminate inflorescence is always axillary, since the production of a terminal flower would stop further growth in that direction and thus terminate the development of the axis. The raceme is the typical flower cluster of the indefinite sort. In such an arrangement the oldest flowers are at the lower nodes, new ones appear- ing only as the axis lengthens and pro- duces new internodes. The little scale or bract usually found at the base of the pedi- cel in flower clusters of this sort is a re- duced leaf, and the fact that the flower stalk springs from the axil shows it to be of the essential nature of a branch. When the flowers are sessile and crowded on the axis in various degrees, the cluster produced may be a spike, as seen in the plantain, knotweed, etc., or a head, like that of the clover, buttonwood, and syca- more. The catkins that form the characteristic inflorescence of most of our forest trees are merely pendant spikes. The corymb is a modification of the raceme in which the lower pedicels are elongated so as to place their flowers on a level with those of the upper nodes, making a convex, or more or less flat- topped cluster, as in the wall-flower and haw- thorn. The umbel dif- fers from the corymb in having the pedicels with their bracts all gathered at the top Of the pe- yi<j. 168. — Catkins of aspen. Fig. 167. — Raceme of milk veteh {Astraga- lus).. 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 Andrews, Eliza Frances, b. 1840; Lloyd, Francis Ernest, 1868-1947. ed. New York, Cincinnati [etc. ] American book company
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