. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. Fig. 169. —Corymb of plum blossoms. Fig. 170. - weed. - Umbel of milk- duncle, from which they spread in every direction like the rays of an umbrella, as the name implies. This is the preva- lent type of flower cluster in the parsley family, which takes its botanical name, Umbelliferce, from its characteristic form of inflores- cence. The pedi- cels of an umbel are called rays, and the circle of bracts at the base of the cluster is an invo- lucre. 162. Determi- nate, or cy
. A practical course in botany, with especial reference to its bearings on agriculture, economics, and sanitation. Botany. Fig. 169. —Corymb of plum blossoms. Fig. 170. - weed. - Umbel of milk- duncle, from which they spread in every direction like the rays of an umbrella, as the name implies. This is the preva- lent type of flower cluster in the parsley family, which takes its botanical name, Umbelliferce, from its characteristic form of inflores- cence. The pedi- cels of an umbel are called rays, and the circle of bracts at the base of the cluster is an invo- lucre. 162. Determi- nate, or cymose, inflorescence. — In the cyme, the typical cluster of the de- terminate kind, the older blossoms in the center, being ter- minal, stop the axis of growth in that direction and force the stem, in continuing its growth, to send out side branches from the axils of the topmost leaves, in a manner precisely similar to the two- forked branching of stems like the horse- chestnut and jimson weed. When the older peduncles are length- ened as described in 161, a flat-topped cyme is produced, which is distinguished from the Fig. 171. — Panicle ° of grass, a compound corymb by its order of cluster of the racemose a„„„ • , „ „U„„ + type flowering, the oldest blossoms being at the center, while in the corymb they appear in the reverse order. A peculiar form of cyme is found in the scorpioid. 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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