Iris pseudacorus |
Iris tenax |
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pale yellow iris |
Oregon flag, tough-leaf iris |
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Habit | Herbaceous perennial from short, thick rhizomes, forming dense clumps, the simple flowering stem up to 1 m. tall, leafy. | Herbaceous perennials from slender rhizomes, forming large clumps, the slender flowering stems up to 3.5 dm. tall with 1-4 leaves. |
Leaves | Basal leaves stiff, narrowly linear, 5-9 dm. long and 10-15 mm. broad; cauline leaves reduced upward. |
Leaves mostly basal, narrowly linear, up to 4 dm. long and 2-6 mm. broad; cauline leave few, 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. |
Flowers usually solitary, lavender or blue to purple, but occasionally white to yellow or pinkish, subtended by a pair of involucral leaves which may be 2 cm. apart; pedicels 1-4 cm. long; perianth parts fused in a tube at the base, the tube 6-10 mm. long; sepals 3, oblanceolate to obovate, 5.5-6.5 cm. long, spreading; petals 3, oblanceolate, 3.5-6 cm. long, erect; style branches 25-30 mm. long with 2 terminal lobes 8-12 mm. long; stigmas triangular; ovary inferior. |
Fruits | Capsule 3-celled, leathery, 5-8 cm. long. |
Capsule 3-celled, leathery, 25-35 mm. long. |
Iris pseudacorus |
Iris tenax |
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Flowering time | May-July | April-June |
Habitat | Wetlands, lake and pond margins, irrigation ditches, backwaters, and other wet places where often disturbed; invasive. | Prairies, meadows, open oak and coniferous forests, at low to middle elevations. |
Distribution | Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; British Columbia to California, east to Idaho and Montana; also in eastern North America.
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Occurring west of the Cascades crest in Washington; Washington to California.
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Origin | Introduced from Eurasia | Native |
Conservation status | Not of concern | Not of concern |
Sibling taxa | ||
Subordinate taxa | ||
Web links |
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