. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. hem may be answered from potatoes in the bin. How earlyin the life of the plant do the tubers begin to form? Do thetubers grow above the roots or below them? Does the positionvary between hard and mellow soils? Are potatoes produced onrhizomes or roots? Do they form on the very end of the under-ground stalk? Does one stalk ever bear more than one tuber, — dotubers form sucoeBsively on a stalk, or does a stalk ever branch? SUXrifUBS AND LAYERS 367 Do these stalks increase in length or diameter
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. hem may be answered from potatoes in the bin. How earlyin the life of the plant do the tubers begin to form? Do thetubers grow above the roots or below them? Does the positionvary between hard and mellow soils? Are potatoes produced onrhizomes or roots? Do they form on the very end of the under-ground stalk? Does one stalk ever bear more than one tuber, — dotubers form sucoeBsively on a stalk, or does a stalk ever branch? SUXrifUBS AND LAYERS 367 Do these stalks increase in length or diameter after the tuber be-gins to form? From what part of the plant do these stalks spring?Is there ever a stem on both ends of a potato? From what pointdo the roots of a potato plant first spring,— from the old seedtuber, or from other parts? If an entire tuber is planted, do allthe eyes grow? LXXI. RUNNERS AND LAYERS 459. A stalk or culm of a sedge or carex hasfallen to the ground in Fig. 386, and from fourof the nodes branches have arisen and from twoof them roots have started. These new branches. Pio. of a sedge. 368 IiJ!SSOIfS WITS PLANTS are at first sustained by the parent plant, but asthe roots develop from the nodes, the branchesbecome more and more self-sustaining, and finallythe old culm rots away and the plants are inde-pendent. Such . a prostrate rooting shoot is alayer. » 460. The strawberry propagates both by seedsand by runners (Fig. 387). In most cultivated
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
