. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 796 THE DISTRIBUTION OF SPECIES BY OFFSHOOTS. {Helianthus tuberosus) the tuber-forming shoots are short; the colony is therefore crowded, and only spreads slowly over a larger area. The Alpine Enchanter's Nightshade (Circoia alpina; see fig. 444^) forms elongated tubers at the end of shoots 6 cm. in length, about 5 of them round the mother-plant, whilst each of the new plants arising from these tubers repeats this formation in the same colony. Since 6 cm. is a considerable length compared with the si
. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 796 THE DISTRIBUTION OF SPECIES BY OFFSHOOTS. {Helianthus tuberosus) the tuber-forming shoots are short; the colony is therefore crowded, and only spreads slowly over a larger area. The Alpine Enchanter's Nightshade (Circoia alpina; see fig. 444^) forms elongated tubers at the end of shoots 6 cm. in length, about 5 of them round the mother-plant, whilst each of the new plants arising from these tubers repeats this formation in the same colony. Since 6 cm. is a considerable length compared with the size of the Enchanter's Nightshade, the group is scattered and in a few years extends over a considerable area. The tuber formation of Thladiantha dubia, a gourd-like plant gi'owing in. Fig. with tubers and bulbs whose mode of growth leads to the formation of colonies arranged in lines and clusters, i Musmri racemosum. a Thladiantha dubia. s Circcea alpina. Eastern Asia, is especially luxuriant; its shoot-formation is shown in fig. 444 \ In this plant a whole series of tubers which are chained together by thin threads 4-8 cm. long is formed on each shoot. Usually they form series of 6-10, and such a chain is about 50 cm. long. As a new plant grows from each tuber and again produces chains of underground tubers, the Thladiantha in a few years may occupy an area of 10 sq. metres, and will form a cluster which is both crowded and rapidly mcreasing in circumference. A further excellent example of the same thing is Glaux maritima which often spreads in the most diagrammatic manner in bare sandy places near the sea-shore. Many tuber-forming plants producing clustered colonies inhabit marshes, espe- cially such as are liable to great alteration in the level of the water and are exposed in years of drought to the danger of temporarily drying up. Many Pond-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabili
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
