General:
Perennial herb from a slender rhizome; stems erect, sometimes prostrate and matted, simple, few to several, smooth or hairy, 10-50 cm tall/long.

Leaves:
Basal leaves lacking; stem leaves alternate, long-stalked, clover-like, the blades 1-5 cm long, the leaflets broadly heart-shaped, folded towards each other, smooth or the margins hairy.

Flowers:
Inflorescence of 2-7 flowers on smooth or hairy stalks 5-15 cm long; petals yellow, 4-9 mm long, entire; sepals 2-5 mm long.

Fruits:
Capsules, oblong, 8-15 mm long, sparsely long-hairy, the hairs with partitions; seeds egg-shaped, 0.8-1.2 mm long, cross-ridged.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Ceratoxalis coloradensis (Rydb.) Lunell
Ceratoxalis cymosa (Small) Lunell
Oxalis bushii (Small) Small
Oxalis coloradensis Rydb.
Oxalis cymosa Small
Oxalis europaea Jord.
Oxalis europaea var. bushii (Small) Wieg.
Oxalis europaea var. rufa (Small) Young
Oxalis fontana Bunge
Oxalis fontana var. bushii (Small) Hara
Oxalis interior (Small) Fedde
Oxalis rufa Small
Oxalis stricta var. decumbens Bitter
Oxalis stricta var. piletocarpa Wieg.
Oxalis stricta var. rufa (Small) Farw.
Oxalis stricta var. villicaulis (Wieg.) Farw.
Xanthoxalis bushii Small
Xanthoxalis coloradensis (Rydb.) Rydb.
Xanthoxalis cymosa (Small) Small
Xanthoxalis dillenii var. piletocarpa (Wieg.) Holub
Xanthoxalis interior Small
Xanthoxalis rufa (Small) Small
Xanthoxalis stricta (L.) Small
Xanthoxalis stricta var. piletocarpa (Wieg.) Moldenke