CHE REFERENCE LIBRARY - Pole Shift Survival Information

is mostI!. concerned with bulb-like and
corm-like organs, dkision operates
mostly with tubers, rootstock, suckers
an d various kinds of offsets.
A f&er is a prorninentl~r thickened
portion of a root or ~111, and it is
usually- subtcrra nean. The pota to,
sweet potato and dahlia furnish good
examples. The stem-tuber, even if S
underground, has more or less wellnlarked
e?-es. or buds, as the common
potato ; the word f~rl,c~ is sometimes
resfrktcd to thickened parts of stems.
Tuberiferous plants
are multiplied by plant- F,c
z. 50. Oblong t.ubem
ing these tubers whole, uudrr the crown of day-lily.
or in man?’ c8ses the
tubers may be cut into small portions, as
described in Chapter V, in the descriptions of
cuttings. In hardy species, the tubers may
be allowed t.o remain in the ground over
winter, but the>- are generally dug in autumn
~(1 stored in a dry and cold place, but where
the!. will not freeze.
Tubers are of endless conformation. Often
they are fascicled underneath the crown of the
plant, as in the garden ranunculus and also in
the dahlia and day-lily (Fig. SO). They may
occur in long strings, as in the ground-nut or
apios. In the garden anemone (A. corona&)
the)- are irregular and fantastic in shape.
FIG. 51. Pseuclo- A special form of stem-tuber is the pse2dobuZb
bulb of orchid, (1iterAly “false bulb “) of many orchids (Fig.
bmring a leaf at
the top. 52). In some species, the pseudobulb is short