Iris hexagona |
Iris pseudacorus |
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yellow flag, yellow water iris |
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Habit | Herbs to 150 cm tall. | |
Roots | fleshy; rhizomes pink, freely branching, producing extensive clumps with remains of old leaves. |
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Stems | usually 1-branched. |
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Leaves | deciduous; stiff; erect at first then recurved; blades dark green with prominent median thickening, 20–30 mm wide; cauline leaves equal in height to inflorescence. |
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Inflorescences | 4–12-flowered; bracts subequal, green with brown margins; outer bract strongly keeled. |
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Flowers | perianth bright yellow or cream; signal a darker yellow basal patch delimited by short, brown lines; petals without veining; tube 12–13 mm; stigmas rounded with prominent tongue. |
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Fruits | angled, with obvious groove at each angle. |
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Seeds | D-shaped, flattened; corky, lustrous. |
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2n | =24, 30, 32, 34. |
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Iris hexagona |
Iris pseudacorus |
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Distribution | ||
Discussion | Swamps, wet shores of rivers and lakes, irrigation ditches. Flowering May–Jun. 0–1000 m. BW, CR, Est, Lava, WV. CA, ID, NV, WA; throughout North America; northern Africa, Eurasia. Exotic. A native to Eurasia and Africa, this taxon is considered invasive in Oregon. |
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Source | Flora of Oregon, volume 1, page 261 Ann Willyard |
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Sibling taxa | ||
Web links |
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