Iris prismatica

Pursh

Fl. Amer. Sept. 1: 30. 1814.

Common names: Slender blue iris
Endemic
Treatment appears in FNA Volume 26. Treatment on page 395. Mentioned on page 373.

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.


Phenology: Flowering Apr–Jul.
Habitat: Swampy, peaty soil

Distribution

V26 810-distribution-map.jpg

Ala., Conn., Del., Ga., Ky., Maine, Md., Mass., N.H., N.J., N.Y., N.C., R.I., S.C., Tenn., Va.

Discussion

Selected References

None.

Lower Taxa

None.

"dm" is not declared as a valid unit of measurement for this property."decreasing" is not a number."thin" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Iris prismatica"
dehiscing +  and latrorse +
Norlan C. Henderson +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
attenuate +
Prismaticae +
additional +
cordlike +
enlarging +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (?) +  and 1.4 cm14 mm <br />0.014 m <br /> (?) +
Slender blue iris +
quadrate +
0.5cm +  and 0.7cm +
monochasial +
Ala. +, Conn. +, Del. +, Ga. +, Ky. +, Maine +, Md. +, Mass. +, N.H. +, N.J. +, N.Y. +, N.C. +, R.I. +, S.C. +, Tenn. +  and Va. +
concave +
0.6 cm6 mm <br />0.006 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
distinct or;partly completely connate +
hollow +  and solid +
ridged +  and terete +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
sessile +  and pedicellate +
fragrant +
upward-facing +
hollow +, solid +, branched +  and simple +
flattened +, terete +  and cordlike +
indehiscent +  and loculicidal +
woody;firm;cartilaginous +
Swampy, peaty soil +
multicellular +
distinct +
cauline +  and basal +
scale-like +
distinct +
conspicuous +
triangular +  and rounded +
flattened +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
4 cm40 mm <br />0.04 m <br /> (18 cm180 mm <br />0.18 m <br />) +
differentiated +
3.5 cm35 mm <br />0.035 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
reflexed +, spreading +  and erect +
reduced +
0.7 cm7 mm <br />0.007 m <br /> (?) +  and 1.5 cm15 mm <br />0.015 m <br /> (?) +
Flowering Apr–Jul. +
40 cm400 mm <br />0.4 m <br /> (?) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Fl. Amer. Sept. +
superficial +
heterogeneous +
heterogeneous +
tan;dark-brown +
conspicuously roughened +  and extensively corky +
4 +  and 20 +
pyriform +
violet +  and pale violet +
reflexed +  and spreading +
expanding +
1.3 cm13 mm <br />0.013 m <br /> (2 cm20 mm <br />0.02 m <br />) +
persisting +
lanceolate +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
membranaceous +  and scarious +
monochasial +
1-2-branched +  and simple +
triangular +
3-lobed +  and filiform +
2 cm20 mm <br />0.02 m <br /> (?) +  and 3 cm30 mm <br />0.03 m <br /> (?) +
Undefined subg. Limniris +
Iris prismatica +
Iris (sect. Limniris) ser. Prisimaticae +
species +
connate +  and distinct +
scarious +
spathaceous +  and more-flowered +
obscure;prominent +
hardened +  and papery +
unequal +