. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. **4i Fig. and refined its contents. (in their native home),and also multiply it bysending forth shootsfrom every bud. Thisstored food happens tobe nutritious to man,and by cultivation andlong-continued selectionhe has greatly increasedthe size of the tuberBut to the plant, the tuber, like a bulb or corm, serves the two pur- TUBEBOnS PABTS 363 poses of maintaining life during unpropitious sea-sons and of multiplying the number of individ-uals. 456. What is a sweet potato? One is sh
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. **4i Fig. and refined its contents. (in their native home),and also multiply it bysending forth shootsfrom every bud. Thisstored food happens tobe nutritious to man,and by cultivation andlong-continued selectionhe has greatly increasedthe size of the tuberBut to the plant, the tuber, like a bulb or corm, serves the two pur- TUBEBOnS PABTS 363 poses of maintaining life during unpropitious sea-sons and of multiplying the number of individ-uals. 456. What is a sweet potato? One is shownin Fig. 381. It has no eyes or scales. It pro-duces roots. It is a thickened Fig. potato. 456a. In botanical writings, a muoh-thiekened and shortenedstem is called a tuber; a mueli thickened root is called a tuberousroot. It would probably be better if both were called tubers, onebeing designated as stem-tuber and the other as root-tuber. Stem-tubers may produce roots from their surface, but they usually donot. 4566. A tuber, then, may be defined as a prominently thickenedand homogeneous portipn of a root or stem, usually subterranean,and which does not increase or perpetuate itself (as bulbs andcorms do) by direct offshoots or accessions. 457. There is a third class of tubers whichpartakes of the nature of both root and are sometimes called tubercles, although thename is unfortunate. Dahlia roots, turnip, beet, 364 IiJESSOIfS WITH PLANTS do not always radish, carrot, parsnip, salsify (Fig. 382) are top or crown is stem, and stands at the sur-face of the ground; and fromthis portion only are youngplants or flower-stalks
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
