This unusual Oxalis has twisting vertical branches that are leafless most of the year. In winter the stems are covered in tiny succulent leaves and tons of bright yellow flowers.
Soil
Oxalis herrerae
Succulent species with swollen petioles to 3ft. tall
Oxalis namaquana
Large yellow flowers winter thru spring, some can bloom year-round. Palm-like leaves on upright stems. Keep dry when dormant in summer.
Oxalis palmifrons
Winter growing bulb with light pink flowers. Amazing palmate leaves. Will go dormant in the summer heat.
Oxalis peduncularis
Small vibrant yellow flowers with dark red sepals. Grows wide and shrubby, to 12″h. Will bloom year-round with enough sunlight except when dormant.
Oxalis tetraphylla deppei
Small succulent bulb with clover leaves. Grows and flowers, pink flowers, spring through summer, bulbs multiply by fall. Dormant in winter. Can overwinter, but does best if you bring it in when cold.
Oxalis vulcanicola
O. spiralis ssp. vulcanicola
Small semi-succulent species with small clumps of reddish leaves