. Introduction to structural and systematic botany, and vegetable physiology. Botany. 407. There are several abnormal modifications of definite inflo- rescence, arising from irregular development, or the suppression of parts, such as the non-appearance sometimes of the central flower, or often of one of the lateral branches at each division; as in the ultimate ramifications of Fig. 331, where one of the lateral pedicels is wanting. When this deviation is completely manifested, that is, when one of the side branches regularly fails, the cyme is apparently converted into a kind of one-sided race
. Introduction to structural and systematic botany, and vegetable physiology. Botany. 407. There are several abnormal modifications of definite inflo- rescence, arising from irregular development, or the suppression of parts, such as the non-appearance sometimes of the central flower, or often of one of the lateral branches at each division; as in the ultimate ramifications of Fig. 331, where one of the lateral pedicels is wanting. When this deviation is completely manifested, that is, when one of the side branches regularly fails, the cyme is apparently converted into a kind of one-sided raceme, and the flowers seem to expand from below upwards, or centripetaUy. • The diagram, Fig. 332, when compared with Fig. 331, explains this anomaly. The place of the axillary branch which fails to develop at each ramifica- tion is indicated by the dotted lines. Cases like this occur in several Hypericums, and in some other opposite-leaved plants. An analogous case oc- curs in many alternate-leaved plants ; where the stem, being terminated by a flower, is con- tinued by a branch from the axil of the uppermost leaf or bract; this, bearing a flower, is similarly prolonged by a secondary branch; that by a third, and so on ; as is shown in the diagram, Fig. 333. Such forms of inflo-. FIG. 331. The open, progressiTely developed cyme of Alsine Michauxii. FIG. 332, 333. Plan of two modifications of helicoid cymes or iiuav 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 Gray, Asa, 1810-1888. New York [etc. ] Ivison, Blakeman, Taylor & Co.
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1850, booksubjectbotany
