. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. SECTION 7.] THEIR AKBANGEMENT. 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 the sheathing base of the leaf may answer to petiole, the summit of the sheath commonly projects as a thin and short membrane, like an ocrea: this is called a Lig
. Gray's school and field book of botany. Consisting of "Lessons in botany," and "Field, forest, and garden botany," bound in one volume. Botany; Botany. SECTION 7.] THEIR AKBANGEMENT. 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 the sheathing base of the leaf may answer to petiole, the summit 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. In 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. 180. 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 OP LEAVES. 181. Phyllotaxy, meaning leaf-arrangement, is the study of the position o* leaves, or parts answering to leaves, upon the stem. '.82. The technical name for the attachment of leaves to the stem is. 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; Gray, Asa, 1810-1888. Elements of botany for beginners and for schools; Gray, Asa, 1810-1888. Field, forest, and garden botany. New York : American Book Co.
Size: 1294px × 1930px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1887
