Iris prismatica |
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slender blue iris |
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Rhizomes | superficial or only slightly buried in peaty soil, cordlike portions usually 1-branched, 40 cm × 2–5 mm, bearing scalelike leaves at nodes; nodal roots absent. |
Stems | simple or 1–2-branched, 3–8 dm. |
Leaves | basal with blade slightly ribbed, 3–6 dm × 0.2–0.5 cm; cauline 1–4, erect. |
Inflorescence units | 1–3-flowered, branch units 1–2-flowered; spathes pale brown, narrowly lanceolate, 2–4 cm, scarious or partially membranaceous. |
Flowers | perianth pale blue or blue-violet; floral tube 0.2–0.3 cm; sepals pale violet, veined deep violet basally, ovate, 4–5 × 1.3–2 cm, base abruptly attenuate; petals lavender, oblanceolate, 3.5–4.5 × 0.7–1.5 cm; ovary trigonal, sharply angled; style arched, narrow, 2–3 cm, crests divergent, quadrate, 0.5–0.7 cm, margins serrate; stigmas sharply triangular; pedicel somewhat flattened, 3–7 cm, exserted from spathe. |
Capsules | sharply 3-angled, almost winged, 3–4 × 1.2–1.4 cm, concave faces 6–14 mm wide. |
Seeds | in 1 row per locule, buff to dark brown, pyriform, with convex sides, 3–4 mm, smooth. |
2n | = 42. |
Iris prismatica |
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Phenology | Flowering Apr–Jul. |
Habitat | Swampy, peaty soil |
Distribution |
AL; CT; DE; GA; KY; MA; MD; ME; NC; NH; NJ; NY; RI; SC; TN; VA
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Source | FNA vol. 26, p. 395. |
Parent taxa | Iridaceae > Iris > subg. Limniris > sect. Limniris > ser. Prisimaticae |
Sibling taxa | |
Name authority | Pursh: Fl. Amer. Sept. 1: 30. (1814) |
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