CHE REFERENCE LIBRARY - ZetaTalk

is mostI!. concerned with bulb-like andcorm-like organs, dkision operatesmostly with tubers, rootstock, suckersan d various kinds of offsets.A f&er is a prorninentl~r thickenedportion of a root or ~111, and it isusually- subtcrra nean. The pota to,sweet potato and dahlia furnish goodexamples. The stem-tuber, even if Sunderground, has more or less wellnlarkede?-es. or buds, as the commonpotato ; the word f~rl,c~ is sometimesresfrktcd to thickened parts of stems.Tuberiferous plantsare multiplied by plant- F,cz. 50. Oblong t.ubeming these tubers whole, uudrr the crown of day-lily.or in man?’ c8ses thetubers may be cut into small portions, asdescribed in Chapter V, in the descriptions ofcuttings. In hardy species, the tubers maybe allowed t.o remain in the ground overwinter, but the>- are generally dug in autumn~(1 stored in a dry and cold place, but wherethe!. will not freeze.Tubers are of endless conformation. Oftenthey are fascicled underneath the crown of theplant, as in the garden ranunculus and also inthe dahlia and day-lily (Fig. SO). They mayoccur in long strings, as in the ground-nut orapios. In the garden anemone (A. corona&)the)- are irregular and fantastic in shape.FIG. 51. Pseuclo- A special form of stem-tuber is the pse2dobuZbbulb of orchid, (1iterAly “false bulb “) of many orchids (Fig.bmring a leaf atthe top. 52). In some species, the pseudobulb is short