. 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. FORM OR FIGURE. 55 of individual forms of outline we shall select only the most remarkable, leaving others for explanation in the glossary, 264. The most obvious aeransement is that which is founded upon the modes of veining; but it should be premised that different forms of venation often give rise to the same outline. Were we required to characterize our idea of the abstract, typical leaf-form, we should sketch an oval outl
. 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. FORM OR FIGURE. 55 of individual forms of outline we shall select only the most remarkable, leaving others for explanation in the glossary, 264. The most obvious aeransement is that which is founded upon the modes of veining; but it should be premised that different forms of venation often give rise to the same outline. Were we required to characterize our idea of the abstract, typical leaf-form, we should sketch an oval outline of surface, with equal aides and nnequal ends. The nearest approach to this we find, among the. Diagrams of pinnate-veined leaf-forms. 119, orbicular, 120, oval, 121, elliptical, 122, oblong, 123, cuneiform. 124, spatbulate, 125, oblanceolate, 126, obovate, 127, deltoid, 128, lanceolate, 129, ovate. 265. Feather-veined LEAVES. Of these, the following forms depend upon the length of the veinlets in relation to each other and to the midvein. When the lower veinlets 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. Ip 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; (V) 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. 26*7. Again, if the lowest pa
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisher, booksubjectbotany
