Iris pseudacorus |
Iris subg. Limniris |
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fleur-de-lis, horticultural iris, iris jaune, pale-yellow iris, yellow flag, yellow iris, yellow water iris |
beardless iris |
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Rhizomes | pink, freely branching, producing extensive clumps, 2–3 cm diam., with fibrous remains of old leaves; roots fleshy. |
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Stems | usually 1-branched, solid, 7–15 dm. |
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Leaves | basal deciduous, at first erect, then recurved, blade dark green, with prominent median thickening, 4–10 dm × 2–3 cm, slightly glaucous basally; cauline equaling inflorescence unit. |
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Inflorescence units | 4–12-flowered; spathes green with brown margins, outer spathe strongly keeled, inner without keel, 6–9 cm, subequal, margins not scarious. |
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Flowers | perianth bright yellow; floral tube 0.6–0.8 cm, with no constriction into ovary; sepals bright yellow or cream colored, lanceolate to ovate or suborbiculate, 5–7.5 × 3–4 cm, base abruptly attenuate, claw ca. 1/2 length of limb, signal a darker yellow basal patch limited by short, brown lines; petals without veining, lanceolate to spatulate, 2–3 cm; ovary triangular in cross section with concave sides and narrow groove at each angle, 1.5 cm; style keeled, 3–4 cm, crests spreading, 1–1.2 cm, laciniate at apex; stigmas rounded with prominent tongue; pedicel 2.5–7 cm. |
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Capsules | prismatic to oblong-ovoid, obscurely 3-angled with obvious groove at each angle, 3.5–6 cm, beak 5 mm. |
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Seeds | D-shaped, flattened, 6–7 mm, corky, lustrous. |
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Sepals | without beard, but with signal of crests or ridges, distinct lines or dots, or a patch of contrasting color |
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2n | = 34. |
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Iris pseudacorus |
Iris subg. Limniris |
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Phenology | Flowering Apr–Jun. | |
Habitat | Swamps, wet shores of rivers and lakes | |
Distribution |
AL; AR; CA; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; ME; MS; NC; NH; NY; OH; PA; RI; SC; TN; VA; WA; WV; BC; MB; NB; NF; NS; ON; PE; QC; Eurasia; n Africa [Introduced in North America]
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North America; Eurasia |
Discussion | Species ca. 82 (31 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 26, p. 390. | FNA vol. 26, p. 377. |
Parent taxa | Iridaceae > Iris > subg. Limniris > sect. Limniris > ser. Laevigatae | Iridaceae > Iris |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | I. section Limniris, subg. Limniris | |
Name authority | Linnaeus: Sp. Pl. 1: 38. (1753) | (Tausch) Spach: Ann. Sci. Nat., Bot., sér. 3, 5: 99. (1846) |
Web links |
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