. The elements of botany for beginners and for schools. Plants. SECTION t THEIR ARRANGEMENT. 67 Clover (Fig. 177), they are actuate. When the 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 LlGULA or LlGULE. 178. When stipules are green and leaf-like they act as so much foliage. In the Pea they make up n
. The elements of botany for beginners and for schools. Plants. SECTION t THEIR ARRANGEMENT. 67 Clover (Fig. 177), they are actuate. When the 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 LlGULA or LlGULE. 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 Locusl 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 of leaves, or parts answering to leaves, upon the .siem. 182. 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. New York : American Book Company
Size: 1295px × 1929px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectplants, bookyear1887
