The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] 42 STEMS. [SECTION 6. prickles, such as those of Blackberry and Roses, are only excrescences of the bark, and not branches. 102. Equally strange forms of stems are characteristic of the Cactus family (Fig. 111). These may be better understood by com- parison with 103. Subterranean Stems and Branches. These are very numerous and various ; but they are commonly overlooked, or else are confounded with roots. From their situation they are out of or- dinary sight; but they will w
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] 42 STEMS. [SECTION 6. prickles, such as those of Blackberry and Roses, are only excrescences of the bark, and not branches. 102. Equally strange forms of stems are characteristic of the Cactus family (Fig. 111). These may be better understood by com- parison with 103. Subterranean Stems and Branches. These are very numerous and various ; but they are commonly overlooked, or else are confounded with roots. From their situation they are out of or- dinary sight; but they will well repay examination. For the veg- etation that is carried on under ground is hardly less varied or important than that above ground. All their forms may be referred to four principal kinds : namely, the Rhizoma (^Rhizome) or Rootstock, the Tuber, the Corm or solid bulb, and the true Bulb. 10*. The Rootstock, or Rhi- zoma, in its simplest form, is merely a creeping stem or branch growing beneath the surface of the soil, or partly covered by it. Or this kind are the so-called creeping, running, or scay roots, such as those
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