. How plants grow [microform] : a simple introduction to structural botany with a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany; Ferns; Botanique; Fougères. 44 HOW PLANTS GROW. IM i!i iii! in jiQtiinpp-loaf : h, the blado ; j), tho footstalk ; ' thp stipules, looking like a pair of little blades, one on each side of the stu But many leaves have no stipules ; many have no footstalk, and then the blade sits directly on the stem (or is nessHc), as in Fi^. 138. Some leaves even have no blade ; but this is uncommon ; for in foliae of leaves, it
. How plants grow [microform] : a simple introduction to structural botany with a popular flora, or an arrangement and description of common plants, both wild and cultivated. Botany; Ferns; Botanique; Fougères. 44 HOW PLANTS GROW. IM i!i iii! in jiQtiinpp-loaf : h, the blado ; j), tho footstalk ; ' thp stipules, looking like a pair of little blades, one on each side of the stu But many leaves have no stipules ; many have no footstalk, and then the blade sits directly on the stem (or is nessHc), as in Fi^. 138. Some leaves even have no blade ; but this is uncommon ; for in foliae of leaves, it is always the blado that is meant, unless something is said to the contrary. 121. Leaves are either siwpir ovcompmuul. They are ninijiff when the blade is all of one piece; com- pdinid, when of more than one piece or blade. Fig. 128 to 132, and 133, are examples of compound fj leaves, tho latter very compound, having as many as eighty-one litth^ blades. 122. Their Structure and Veining. Leaves are com- posed of the same two kinds of material as stems( 110), namely, of wood or iibre, and of cellular tissue. The woody or filn'ous part makes a framework of ribs and veins, which gives the leaf more strength and toughness than it would otherwise have, The cellu- lar tissue forms the (/ree?i jmlp of the leaf. Tliis is spread, as it were, over the framework, both above and below, and supported by it; and the whole is protected by a transparent skin, which is tv'-med the Kjiidcrinis. 123. Ribs. The stouter jiieces or tiinbcM's of tho framework are called Rihs. In the leaf of the Quince (Fig. 82), Pear, Oak (Fig. 120), Sec, there is only a single main rib, running directly through tlie middle of the blade from Ijase to point; this is called the M/i/n'h. But in the Mallow, the Linden (Fig. 83), the Maple (Fig. 84), and many others, there are three, or five, or seven ribs of nearly the same size. The bi\inches of the ribs and the branchlets from them are called 124. Veins and Veinlets. T
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1880, booksubjectbotany
