. Botany of the southern states. In two parts. Botany. INFLORESCENCE. 71 disk florets, (Fig. 110.) The ray and disk florets often differ in respect to the organs they contain. Sometimes they are both perfect—that is, both containing stamens and pistils— when they are said to be homogamous ; at other times, the ray florets may be destitute of either stamens or pistils, or contain Fig. 111.— o. Universal umbel. 6. Partial umbe,. 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 ax
. Botany of the southern states. In two parts. Botany. INFLORESCENCE. 71 disk florets, (Fig. 110.) The ray and disk florets often differ in respect to the organs they contain. Sometimes they are both perfect—that is, both containing stamens and pistils— when they are said to be homogamous ; at other times, the ray florets may be destitute of either stamens or pistils, or contain Fig. 111.— o. Universal umbel. 6. Partial umbe,. 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 a 'partial umbel. , 115t 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 lower ones 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. [from old catalog]. New York, A. S. Barnes & co.
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