. Plants and their uses; an introduction to botany. Botany; Botany, Economic. THE VEGETATIVE ORCiAXS COAIPARED 337 sort of sheath. The framework of the leaf when it reaches the blade divides into a number of main liranches, or ribs. These radiate from the top of the petiole and may divide again into secondary branches, or veins, which finallj' are connected so as to form an irregular net-work by minute branches called veiiilets. When a leaf has rilis radiating thus, like the bones in the ]:)alm of one's fiand, it is said to lie pal- matehj ribberl, and when the veinlets form an irregular net-.
. Plants and their uses; an introduction to botany. Botany; Botany, Economic. THE VEGETATIVE ORCiAXS COAIPARED 337 sort of sheath. The framework of the leaf when it reaches the blade divides into a number of main liranches, or ribs. These radiate from the top of the petiole and may divide again into secondary branches, or veins, which finallj' are connected so as to form an irregular net-work by minute branches called veiiilets. When a leaf has rilis radiating thus, like the bones in the ]:)alm of one's fiand, it is said to lie pal- matehj ribberl, and when the veinlets form an irregular net-. FiG. 291.—Erect Silky Clematis (Clematis ochroleuca, Crowfoot Family, Ranunculacea:). Flowering branches. Fruit. (Britton and Brown.)— Perennial herb, somewhat woody, .30-60 cm. tall; leaves silky-hairy beneath; flowers yellowish; fruit yellowish brown. Native home. Eastern United .States. work, it is nefted-veined. The ribs and veins are also called nerves and their arrangement the nervation of a leaf, the ar- rangement of the veinlets being called the venation. On comparing with the leaves of the marsh-marigold those of the ditch crowfoot we find the same general plan of struc- ture but with the difference that the leaf base is narrower, and the blatle is divided into branches corresponding to the The branches of the upper leaves are so narrow as to. 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 Sargent, Frederick Leroy, 1863-. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
