. Class-book of botany [microform] : being outlines of the structure, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. FORM OR FIGURK. 51 orbicular in figure and larger than any other, presenting the form of the uucient lyre, the form is termed lyrate, 14^ 144. Feather-velnod leaves almost compound. 143, Nigellti (pinnatisi^ct). 144, Chclidonium ma- Jus. 145, Thistlo (Cirsium lanceolatum). 146, Dandelion (runcinate-lyrate). 270. PiNNATELv PARTE ) iuiplics that the incisions arc dee
. Class-book of botany [microform] : being outlines of the structure, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. FORM OR FIGURK. 51 orbicular in figure and larger than any other, presenting the form of the uucient lyre, the form is termed lyrate, 14^ 144. Feather-velnod leaves almost compound. 143, Nigellti (pinnatisi^ct). 144, Chclidonium ma- Jus. 145, Thistlo (Cirsium lanceolatum). 146, Dandelion (runcinate-lyrate). 270. PiNNATELv PARTE ) iuiplics that the incisions arc deeper than pinnatijidy 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 lobeSy 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 Renifarm, ' idney-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 seen in liydrocotyle. It may be orbicular, oval, etc. 272. Palmate forms. The following result from deficiency of tis- .suc, causing ucep uivisions between tixs veins. L/eaves tiius dissectcu are said to he palmately-lobed when either the scgminits or the sinuses are .somewhat rounded and continuous, Tlie number of lobes is de- noted by such terms as bilobate, trilobate, five-lobed, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of t
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, booksubjectpl
