Page author: David Giblin
Iris pseudacorus
pale yellow iris
WTU specimens
Other herbaria

Distribution: Widely distributed throughout much of Washington; widely distributed throughout much of North America.

Habitat: Weed in ditches and ponds at low elevations.

Flowers: May-July

Origin: Introduced from Eurasia

Conservation Status: Not of concern

Description:
General:

Herbaceous perennial from short, thick rhizomes, forming dense clumps, the simple flowering stem up to 1 m. tall, leafy.

Leaves:

Basal leaves stiff, narrowly linear, 5-9 dm. long and 10-15 mm. broad; cauline leaves reduced upward.

Flowers:

Inflorescence branched, few to several flowered, 1.5-5 dm. long; flowers pale to deep yellow, purple-lined; pedicles up to 5 cm. long; perianth parts fused in a tube at the base, the tube about about 12 mm. long; sepals 3, obovate, spreading, about 5 cm. long; petals 3, much shorter and narrower than the sepals, upright; stamens 3, opposite the sepals; style branches 3, about 22 mm. long, with 2 terminal lobes less than as long; stigma triangular; ovary inferior.

Fruits:

Capsule 3-celled, leathery, 5-8 cm. long.

Accepted Name:
Iris pseudacorus L.
Publication: Sp. Pl. 1: 38. 1753. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Iris pseudacorus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Iris pseudacorus checklist entry.

E-Flora BC: Iris pseudacorus atlas page.

CalPhotos: Iris pseudacorus photos.

USDA Plants: Iris pseudacorus information.

31 photographs:
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