The Latin specific epithet dubium means "dubious" or "unlike others of the genus".

[4] Growing to 50 cm (20 in) tall, O. dubium is a bulbous perennial with 3-8 yellowish green leaves.

The tepals may be orange, red, yellow or rarely white, often with a green or brown center.

The main soil requirement is excellent drainage, with ample water early in the growth cycle, but dry during the dormant season.

[2] This plant has gained the Royal Horticultural Society's Award of Garden Merit.