. Botany of the southern states. In two parts. Part I. Structural and physiological botany and vegetable products. Part II. Descriptions of southern plants. Arranged on the natural system. Preceded by a Linnæan and a dichotomous analysis. Botany -- Southern States. a. Universal umbel, h. Partial pistils only, and the disk contain only stamens; in any of these cases, the capitulum is said to be heterogamous. Umbel (Fig. Ill) is formed when the secondary axes origi- nate from the same point on the stem, and rise to nearly the same height. The whole is called a universal umbel. If ^'^* ^^~
. Botany of the southern states. In two parts. Part I. Structural and physiological botany and vegetable products. Part II. Descriptions of southern plants. Arranged on the natural system. Preceded by a Linnæan and a dichotomous analysis. Botany -- Southern States. a. Universal umbel, h. Partial pistils only, and the disk contain only stamens; in any of these cases, the capitulum is said to be heterogamous. Umbel (Fig. Ill) is formed when the secondary axes origi- nate from the same point on the stem, and rise to nearly the same height. The whole is called a universal umbel. If ^'^* ^^~ the secondary axes develop ter- tiary ones in the same manner, each is called 2l partial umbel. 115. The preceding varieties follow the centripetal order of flowering—that is, the flowers farthest from the center expand first. But there are others of the determinate form which follow the centrifugal order—that is, the central or upper ones ex- pand first, and the external or Cyme. lower ones What are disk florets ? When homo2:amous ? When heteroffamons! What is an umbel? A universal umber? A partial umbel?—115. What is the centripetal order of inflorescence ? The centrifugal ?. 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 Darby, John, 1804-1877. New York, A. S. Barnes
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