Shoot Anatomy of Three Bulbous Species of Oxalis

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Abstract
The shoots of Oxalis latifolia, O. corymbosa and O. oxyptera are comprised of underground bulbs which send out stolons with apical and lateral bulbs. The external scales of the bulbs form the base of the leaves; an adnation of the stipules to the petiole occurs as well. In O. oxyptera the bulb shows primitive characters and can be considered a rhizome-shaped bulb. Incipient secondary growth and schizo-lysigenous secretory cavities are described. An ascending evolutionary sequence of O. oxyptera, O. latifolia and O. corymbosa is proposed based on the vegetative system.

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