Oxalis species may be either annuals or perennials, characterized by fibrous, bulb-like, or rhizomatous root systems. The foliage typically features palmately divided leaves, while the flowers are mostly funnel- or bowl-shaped and tend to close during overcast conditions and at night.

Oxalis obtusa peach and cream-flowered

Oxalis obtusa peach-flowered

Oxalis obtusa tangerine-flowered

Oxalis obtusa yellow & red-flowered

Oxalis orange-flowered

Oxalis oregana is a low-growing, rhizomatous perennial characterized by its hairy, medium-green trifoliate leaves. From spring through autumn, it produces solitary flowers that can be rose-pink, lilac, or white, each measuring around 2.5 cm in diameter, borne on slender stems. This species typically grows to a height of 20 cm and can spread extensively, thriving in shaded woodland environments where it can naturalize effectively.

Oxalis oregana

Oxalis oregana 'Bob Haszeldine'

Oxalis oregana 'Klamath Ruby'

Oxalis oregana f. smalliana is a low-growing, rhizomatous perennial that reaches heights of up to 15 cm when in bloom. Its leaves are bluntly heart-shaped, featuring a dull green surface and a hairy, purplish underside. During late spring and early summer, it produces single flowers that range from white to deep pink, each measuring up to 4 cm in width.

Oxalis oregana f. smalliana

Oxalis oregana white-flowered

Oxalis ornata

Oxalis ortgiesii

Oxalis palmifrons is a bulbous perennial that grows slowly and spreads over time. This deciduous plant goes dormant in the summer, producing clusters of thick, green leaves that resemble palm fronds and may display red-orange hues in the fall. During the autumn to winter period, it produces trumpet-shaped flowers that are white to pale pink, featuring yellow stripes at their centers.

Oxalis palmifrons

Oxalis peduncularis

Oxalis perdicaria is a bulbous perennial characterized by its clump-forming growth habit and tuberous roots. In spring, it produces dense clusters of bright green, shamrock-shaped foliage. This leaf growth is ephemeral; the leaves fade shortly after emerging. However, they return in late summer and persist into autumn, coinciding with the emergence of funnel-shaped, yellow flowers.

Oxalis perdicaria

Oxalis perdicaria 'Citrino'

Oxalis pes-caprae

Oxalis pes-caprae 'Flore Pleno' (d)

Oxalis pink-flowered

Oxalis pocockiae

Oxalis polyphylla

Oxalis polyphylla var. heptaphylla

Oxalis polyphylla var. pentaphylla

Oxalis ptychoclada Diels

Oxalis pulchella var. tomentosa

Oxalis pulchra

Oxalis purpurea

Oxalis purpurea 'Alba'

Oxalis purpurea 'Garnet'

Oxalis purpurea 'Grand Duchess'

Oxalis purpurea 'Nigra'

Oxalis purpurea cherry-flowered

Oxalis purpurea deep rose-flowered

Oxalis purpurea yellow-flowered

Oxalis rosea Jacq.

Oxalis san-miguelii

Oxalis semiloba is a robust, clump-forming perennial that grows from bulbs. In mid-spring, it produces vibrant green, lobed leaves that are fleshy in texture. During the summer, the plant showcases pink, trumpet-shaped blooms featuring yellow-green interiors, which close at night. This variety is less aggressive compared to other species in its genus.

Oxalis semiloba

Oxalis smithiana

Oxalis spiralis

Oxalis squamata

Oxalis stenorrhyncha

Oxalis stricta

Oxalis succulenta ambig.

Oxalis teneriensis

Oxalis tetraphylla is a bulbous perennial that typically reaches a height of 10 cm during its flowering period. It features clover-like foliage, characterized by green leaves that have a distinctive dark brown band near the base of each heart-shaped leaflet. The plant produces funnel-shaped flowers in a vivid pink hue, blooming from spring through early autumn.

Oxalis tetraphylla

Oxalis tetraphylla 'Alba'

Oxalis tetraphylla 'Iron Cross' is a low-growing perennial that typically reaches heights of up to 15 cm during its blooming period. This plant features clover-like foliage characterized by green leaves, each heart-shaped leaflet displaying dark brown markings at the base that create a distinctive cross pattern. From late spring through late summer, it produces funnel-shaped flowers in a vibrant brick pink hue.

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