The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] SECTION 7.] THEIR ARRANGEMENT. 67 Clover (Fig. 177), they are adnate. When tlie two stipules unite and sheathe the stem above the insertion, as in Polygonum (Fig. 178), this sheath is called an Ocrea, from its likeness to a greave or leggin. 177. In Grasses, when tlie sheathing base of the leaf may answer to petiole, the suininit of the sheath commonly projects as a thin and short membrane, like an ocrea: this is called a Ligula or Ligule. 178. When stipules are green and le
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] SECTION 7.] THEIR ARRANGEMENT. 67 Clover (Fig. 177), they are adnate. When tlie two stipules unite and sheathe the stem above the insertion, as in Polygonum (Fig. 178), this sheath is called an Ocrea, from its likeness to a greave or leggin. 177. In Grasses, when tlie sheathing base of the leaf may answer to petiole, the suininit of the sheath commonly projects as a thin and short membrane, like an ocrea: this is called a Ligula or Ligule. 178. When stipules are green and leaf-like they act as so much foliage. Ill the Pea they make up no small part of the actual foliage. In a related plant (Lathyrus Aphaca, Fig. 173), they make the whole of it, the remainder of the leaf being tendril. 179. In many trees the stipules are the bud-scales, as in the Beech, and very conspicuously in the Fig-tree, Tulip-tree, and Magnolia (Fig. 179). These fall off as the leaves unfold. ISO. The stipules are spines or prickles in Locust and several other Leguminous trees and shrubs ; they are tendrils in Smilax or Greenbrier § 4. THE ARRANGEMENT OF LEAVES. 181. Phyllotaxy, meaning leaf-arrangement, is the study of the position o^ leaves, or parts'answering to leaves, upon the stem. The technical name for the attachment of leaves to the stem is
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