. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. Diagrams of pinnate-veined leaf-forms. 119, orbicular, 120, oval. 121, elliptical, 122, oblong, 123, cuneiform. 124, spathulato, 125, oblanceolate, 126, obovate, 127, deltoid, 123, lanceolate, 129, 265. Feather-veined leaves. Of these, the following forms depend upon the length of the veinlets in relation V to each other and to the midvein. When the lower veinlcts are longer than the others, the form of the blade will
. Class-book of botany : being outlines of the structure, physiology and classification of plants : with a flora of the United States and Canada. Botany; Botany; Botany. Diagrams of pinnate-veined leaf-forms. 119, orbicular, 120, oval. 121, elliptical, 122, oblong, 123, cuneiform. 124, spathulato, 125, oblanceolate, 126, obovate, 127, deltoid, 123, lanceolate, 129, 265. Feather-veined leaves. Of these, the following forms depend upon the length of the veinlets in relation V to each other and to the midvein. When the lower veinlcts are longer than the others, the form of the blade will be (1) ovate, with the out- line of an egg, the broad end at the base ; (2) lanceolate, or lance- shaped, narrower than ovate, tapering gradually upwards; (3) deltoid or triangular shaped, like the Greek letter A. a. If the middle veinlets exceed the others in length, the leaf will be (4) orbicular, roundish or quite circular; (5) elliptical, with the outline of an ellipse, nearly twice longer than broad; (6) oval, broadly elliptical; (7) oblong, narrowly elliptical. 266. When the veinlets are more largely developed in the upper region of the leaf its form becomes (8) obovate, inversely ovate, the narrow end at base; (9) oblanceolate, that is, lanceolate with the narrow end at base; (10) spatulate, like a spatula, with a narrow base and a broader, rounded apex; (11) cuneate or cuneiform, shaped like a wedge with the point backwards. 267. Again, if the lowest pair of veinlets are lengthened a no more or less recurved, the leaf will be variously modified in respect to its base, becoming (12) cordate, or heart-shaped, an ovate outline with a sinus or reentering angle at base; (13) auricnlate, with ear- shaped lobes at base; (14) sagittate, arrow-shaped, with the lobes pointed, and directed backwards; (15) Estate, halbert-shaped, the lobes directed Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectbotany, bookyear1861
