. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. FORM OB FIGURE. 51 orbicular in figure and larger than any other, presenting the form of the ancient lyre, the form is termed lyrate. 143 144 145 146. Feather-veined leaves almost compound. 143, Nigella (pinnatisect). 144, Cheledonium ma- jus. 145, Thistle (Cirsium lanceolatum). 14G, Dandelion (runcinate-lyrate). 270. Pinnately parted implies that the incisions are deeper than pinnatijid, nearly reaching the midvein. In either c
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. FORM OB FIGURE. 51 orbicular in figure and larger than any other, presenting the form of the ancient lyre, the form is termed lyrate. 143 144 145 146. Feather-veined leaves almost compound. 143, Nigella (pinnatisect). 144, Cheledonium ma- jus. 145, Thistle (Cirsium lanceolatum). 14G, Dandelion (runcinate-lyrate). 270. Pinnately parted implies that the incisions are deeper than pinnatijid, nearly reaching the midvein. In either case the leaf is said to be sinuate when the incisions (sinuses) as well as the segments are .rounded and flowing in outline. Such segments are lobes, and the leaves lobate or lobed, a very generic term. 271. The palmate venation presents us with a set of forms which are, in general, broader in proportion than the pinnate, having the breadth about equaling the length. Such a leaf may be rarely broadly ovate or broadly cordate, terms which require no further explanation. Or it may be Beniform, kidney-shaped, having a flowing outline broader than long, concave at base; or Peltate, shield-form, the petiole not inserted at the margin but in the midst of the lower surface of the blade. This singular form evidently results from the blending of the base lobes of a deeply cordate leaf, as soon in hydrocotyle. It may be orbicular, oval, etc. 272. Palmate forms. The following result from deficiency of tis- sue, causing deep divisions between the veins. Leaves thus dissected are said to be palmately-lobed when either the segments or the sinuses are somewhat rounded and continuous. The number of lobes is do- noted by such terms as bilobate, trilobate, Jive-lobed, etc. ;. 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 Wo
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Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
