Iris pseudacorus


Sp. Pl. 1: 38. 1753.

Common names: Yellow iris pale-yellow iris yellow flag yellow water iris fleur-de-lis iris jaune
Treatment appears in FNA Volume 26. Treatment on page 390. Mentioned on page 374, 388.

Rhizomes pink, freely branching, producing extensive clumps, 2–3 cm diam., with fibrous remains of old leaves; roots fleshy. Stems usually 1-branched, solid, 7–15 dm. 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. Inflorescence units 4–12-flowered; spathes green with brown margins, outer spathe strongly keeled, inner without keel, 6–9 cm, subequal, margins not scarious. 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. Capsules prismatic to oblong-ovoid, obscurely 3-angled with obvious groove at each angle, 3.5–6 cm, beak 5 mm. Seeds D-shaped, flattened, 6–7 mm, corky, lustrous. 2n = 34.

Phenology: Flowering Apr–Jun.
Habitat: Swamps, wet shores of rivers and lakes


Introduced; B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Ala., Ark., Calif., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Maine, Mass., Miss., N.H., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Va., Wash., W.Va., Eurasia, n Africa.


Selected References


Lower Taxa

... more about "Iris pseudacorus"
Norlan C. Henderson +
Linnaeus +
Iris subsect. Laevigatae +
Yellow iris +, pale-yellow iris +, yellow flag +, yellow water iris +, fleur-de-lis +  and iris jaune +
B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Ala. +, Ark. +, Calif. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Mass. +, Miss. +, N.H. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, Tenn. +, Va. +, Wash. +, W.Va. +, Eurasia +  and n Africa. +
Swamps, wet shores of rivers and lakes +
Flowering Apr–Jun. +
W2 +, W1 +, Introduced +  and Illustrated +
Undefined subg. Limniris +
Iris pseudacorus +
Iris (sect. Limniris) ser. Laevigatae +
species +