. A class-book of botany, designed for colleges, academies, and other seminaries ... Illustrated by a flora of the northern, middle, and western states; particularly of the United States north of the Capitol, lat. 38 3/4. Digitate (finger-shaped), having narrower and deepersegments than the palmate, as in the hemp. 19. Pedate (foot-shaped). The same as palmate, except thatthe two lateral lobes arc themselves subdivided, as in thepeony and passion-flower. 20. Laciniate (gashed), the veins and veinlets separate, as ifthe blade were cut and gashed with scissors. Ex. Ranunculus. 21. Peltate (shiel
. A class-book of botany, designed for colleges, academies, and other seminaries ... Illustrated by a flora of the northern, middle, and western states; particularly of the United States north of the Capitol, lat. 38 3/4. Digitate (finger-shaped), having narrower and deepersegments than the palmate, as in the hemp. 19. Pedate (foot-shaped). The same as palmate, except thatthe two lateral lobes arc themselves subdivided, as in thepeony and passion-flower. 20. Laciniate (gashed), the veins and veinlets separate, as ifthe blade were cut and gashed with scissors. Ex. Ranunculus. 21. Peltate (shield-like), the veins radiating in all directions,and aU connected by intervening tissue. This form is gener-ally also orbicular, and appears to result from the union of thebase-lobes. Ex. Podophyllum peltatum, Tropeolum, Brasenia. 22. Reniform, broad-ovate, broad-cordate, &c., may also resultfrom the radiate veining. 234. The form of parallel-veined leaves is less diversifiedthan that of the preceding classes, being 23. Linear, when the veins (and fibres) are straight, as in thegrasses. Tliis form may also occur in the feather-veined leafby an equal development of aU the veinlets as in Lin aria wd-garis, & FIG. 31. — 23* 24, 25, figures of leaves witli parallel veins; 2 — 10, margins of leaves. 24. Oval, lanceolate, oblong, or some kindi-ed form, when theveins are cm^ved, as in Carex, Cypripedium, Orcliis, &c., or itmay be 25. Cordate, when some of the lower veins are curved back-wards and then upwards, as in Pontaderia, and even sagittate,when they are directed downwards at the base, as in the Sagit-taria. 90 THE LEAF. 26 Acerose (needle-shaped), when there is htlle or no distinc-tion of lamina, petiole, or veins, as in the leaves of the pine. §5. MARGIN. 235. The margin of the leaf is also modified chiefly by thesame causes which affect the form. It is said to be 1. Entire^ when even-edged. This may result from the full development of thetissue, or from a vein running p
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectbotany, bookyear1848
