The stem tuber has a vertical orientation with one or a few vegetative buds on the top and fibrous roots produced on the bottom from a basal section, typically the stem tuber has an oblong rounded shape.
12.
The stem tuber has a vertical orientation with one or a few vegetative buds on the top and fibrous roots produced on the bottom from a basal section, typically the stem tuber has an oblong rounded shape.
13.
Some stem tubers, such as those of tuberous begonias, are long lived, but many tuberous plants have tubers that survive only until the plants are in full leaf, at which point the tuber is reduced to a shrivelled up husk.
14.
Thus the roots of " Cyclamen graecum " grow from the base of the tuber, suggesting it is a stem tuber, whereas those of " Cyclamen hederifolium " mostly grow from the upper surface of the tuber, suggesting it is a root tuber.
15.
In some species ( e . g . " Cyclamen coum " ) roots come from the bottom of the tuber, suggesting that it is a stem tuber; in others ( e . g . " Cyclamen hederifolium " ) roots come largely from the top of the tuber, suggesting that it is a root tuber.
16.
Mignonette vine ( " Anredera cordifolia " ) produces aerial stem tubers on vines, the tubers fall to the ground and grow . " Plectranthus esculentus " of the mint family Lamiaceae, produces tuberous under ground organs from the base of the stem, weighing up to 1.8 kg per tuber, forming from axillary buds producing short stolons that grow into tubers.
