. Introduction to structural and systematic botany, and vegetable physiology. Botany. ITS KINDS. 317. 617. Septifragal Dehiscence is a modification of either the loculicidal or the septicidal, in which the valves fall away, leaving the dissepi- ments behind attached to the axis. Fig. 586 is a diagram representing this in a case of loculicidal opening. Fig. 587; from the common Moni- ing-Glory, is this modifica- tion of the septicidal mode. 618. Instead of splitting into separate pieces, the sutures of the pericarp sometimes open for a short distance at their apex only, as in Cerastium and some
. Introduction to structural and systematic botany, and vegetable physiology. Botany. ITS KINDS. 317. 617. Septifragal Dehiscence is a modification of either the loculicidal or the septicidal, in which the valves fall away, leaving the dissepi- ments behind attached to the axis. Fig. 586 is a diagram representing this in a case of loculicidal opening. Fig. 587; from the common Moni- ing-Glory, is this modifica- tion of the septicidal mode. 618. Instead of splitting into separate pieces, the sutures of the pericarp sometimes open for a short distance at their apex only, as in Cerastium and some other Chickweeds, in Tobacco (Fig. 1050), and in the Primrose (Fig. 943) ; or by mere pores, as in the Poppy. The pod of the Snap- dragon opens by the bursting of a hole towards the top of each cell, not corresponding, perhaps, with any suture. Another anomalous mode of dehiscence, namely, the circumcissile, characterizes 619. The Pyxis or Pyxidium, a pod which opens by a circular hor- izontal line cutting off the upper part as a lid. The fruits of the Plantain, Henbane, Amaranth (Fig. 575, which is otherwise a utricle), Pimpernel, and Purslane (Fig. 588) -are of this kind. 620. A Silique is a slender two-valved capsule, with two parietal placenta, from which the valves separate in dehiscence; as in plants of the Cruciferous or Mustard family (Fig. 589), to the fruit of which the term prop- erly belongs. Usually a false partition is stretched across between the two placentte, rendering the pod two-celled in an anomalous manner. 621. A Sllicle or Pouch is merely a short silique, its length not more than twice its breadth; as that of Shep- herd's-Purse, Candytuft, &c. 622. Aggregate Fruits are those in which a cluster of carpels, all belonging to one flower, are crowded on the receptacle into one mass, as in the raspberry and blackberry taken as a whole (Fig. 564), where the constituent fruits, or ripened cai-pels. I 689 FIG. 586. Septifragal modification of loculicidal, and
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