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 (14767243705)

Identifier: classbookbotany00wood (find matches)
Title: 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
Year: 1848 (1840s)
Authors: Wood, Alphonso, 1810-1881
Subjects: Botany Plants -- United States Plants -- Canada
Publisher: Boston, Crocker & Brewster
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden



Text Appearing Before Image:
e Mitchella repens, or 5. Lanceolate (lance-shaped), narrow, and tapering to eachend. Ex. sweet-wilham. When the veins are most developed towards the summit ofthe leaf, it becomes 6. Obovate (inversely^egg-shaped), as in the wahmt; or 7. Spathulate (shaped hke a spathula), as in the daisy.Again, if the lowest veinlets are longest, sending ofFveinulets backwards, the leaf will be 8. Cordate (heart-shaped), like the ovate fca-m, with a hollow(sinus) at the base, as in the lilac. 9. Auriculate, having ear-shaped lobes at the base. Ex.sage. 8* 88 THE LEAF. 10. Hastate (halbert-shaped), hollowed out at the base andsides. Ex. Bitter-sweet. 11. Sagittate (arrow-shaped), with pointed, descending lobesat base. Ex. Polygonum sagittatum; Sagittaria; &:c. 12. Reniform (kidney-shaped), broad, rounded at the apex,and hollowed at the base, as in the Asanim Canadense. a. The following forms depend less upon the proportion ofthe veinlets than on the imperfect development of the tissuebetween them.
Text Appearing After Image:
21 a FIG. 30. —12 —16. figures of feather-veined leaves, the remainder of radiate-veined, 13. Runcinate (re-uncinate), having the margin extended atthe veins into pointed segments, wliich cuive backwards. Ex.Taraxacum. 14. Lyrate (lyre-shaped), mth several deep, rounded sinuses,occasioned by deficiency of tissue between the lower veinlets ;water-cress (Sisymbrium). 15. Pinnatifid (feather-cleft), with deep sinuses between theveinlets, separating each margin of the leaf into oblong, par-allel segments. Ex. Lepidium. 16. Sinuate, having deep, rounded openings between theveinlets, seen in the leaves of the white oak. 233. Radiate-veined leaves assume many forais, dependingupon the direction of the veins, and the quantity of the inter-vening tissue. Some of them are the following. 17. Palmate (palm-shaped), having five lobes, with as manyveins (227) separated by deep divisions, so as to resemble thepalm of the hand with the fingers. Ex. passion-flower. PARALLEL-VEINED LEAVES. 89 18. D