The American botanist and florist; including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union . Jbnnso/Zea?;es.—330, SileneVirginica. 331, Magnolia Fraseri. 336, Arabis dentata. 337, Polygonumorifolium 332, Hepatica acutiloba. 333, Asarum Virginicum. 331, Hydrocotyle Americana. 335,n. umbellata. 292. Pinnatifid forms. The following pinnate-veined forms,approaching the compound leaf, depend less upon the proportionof the veinlets than upon the rela
The American botanist and florist; including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union . Jbnnso/Zea?;es.—330, SileneVirginica. 331, Magnolia Fraseri. 336, Arabis dentata. 337, Polygonumorifolium 332, Hepatica acutiloba. 333, Asarum Virginicum. 331, Hydrocotyle Americana. 335,n. umbellata. 292. Pinnatifid forms. The following pinnate-veined forms,approaching the compound leaf, depend less upon the proportionof the veinlets than upon the relative development of the inter- 7 98 STRUCTURAL BOTANY. veiling tissue. The -pre^x pinnated is obviously used in contrastwith palmated among palmate-veined forms. 293. [pintia^ feather, j^^ic^o, to cleave), feather-cleft,the tissue somewhat sharply cleft between the veinlets abouthalf-way to the mid vein, forming oblong segments. When thesegments of a pinnatifid leaf are pointed and curved backward,it becomes runcinate^ i. e., re-uncinate. When the terminal seg-ment of a pinnatifid leaf is orbicular in figure and larger thanany other, presenting the form of the ancient lyre, the form istermed lyrate.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1870
