Iris giganticaerulea

Small

Addisonia 14: 5, plate 451. 1929.

Common names: Giant blue iris
IllustratedEndemic
Synonyms: Iris elephantina Small Iris hexagona var. giganticaerulea (Small) R. C. Foster Iris miraculosa Small
Treatment appears in FNA Volume 26. Mentioned on page 394.

Rhizomes green, extensively branched, forming large clumps, 2–4 cm diam., with pale leaf-scars. Stems 2–3-branched, solid, 10–15 (–20+) dm. Leaves: basal 4–6, erect, blade bright green, ensiform, 10–13 dm × 2–3 cm, apex slightly curved; cauline with blade foliaceous, appearing as elongated spathe, 5–6.5 dm × 2–3 cm, not exceeding flowers. Inflorescence units 2–3-flowered, branch units 1–2-flowered; spathes tightly enclosing ovary and pedicel, 15–20 cm, subequal; outer narrowly lanceolate, keeled, margins pale, narrow, inner margins translucent, broad, scarious. Flowers: perianth blue or blue-purple; floral-tube tubular-prismatic, 9-ribbed and grooved, 4–5 cm; sepals blue or blue-purple with white streaks surrounding signal, oval to orbicular-oval, 9.5–11 × 4–5 cm, base abruptly attenuate into claw, apex obtusely angled, signal with raised, yellow, pubescent central ridge, claw green, striate, 4–4.5 × 1–1.2 cm; petals erect or spreading-erect, spatulate, 7–8.5 × 2–3 cm, base cuneate, apex emarginate; ovary bluntly 6-angled, 4–4.5 cm; style blue-violet, keeled, 3.5–4 cm, raised above sepals, crests recurved, 1.5–2 cm, margins sharply and irregularly serrate; stigmas 2-lobed with 2 triangular teeth; pedicel columnar, 3.5–5 cm. Capsules drooping, bright green, ellipsoid, hexagonal in cross-section, with 6 broad, rounded lobes, 8–10 × 3 cm, indehiscent; after anthesis, flower stem elongates, arching downward to push capsule into water, where walls broken down and as funiculus broken, seed rises to surface. Seeds in 2 rows per locule, brown, D-shaped, 8–10 mm wide, very corky. 2n = 44.


Phenology: Flowering Mar–Apr.
Habitat: Shallow water or very wet roadside ditches

Discussion

Selected References

None.

Lower Taxa

None.

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

... more about "Iris giganticaerulea"
dehiscing +  and latrorse +
Norlan C. Henderson +
cuneate +  and attenuate +
Iris subsect. Hexagonae +
bright green +
ensiform +
2cm;3cm +
additional +
cordlike +
enlarging +
bright green +
8 cm80 mm <br />0.08 m <br /> (10 cm100 mm <br />0.1 m <br />) +
downward +, arching +  and drooping +
elongate +, hexagonal +  and ellipsoid +
3 cm30 mm <br />0.03 m <br /> (?) +
4 cm40 mm <br />0.04 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Giant blue iris +
1.5cm +  and 2cm +
monochasial +
Ala. +, La. +  and Miss. +
distinct or;partly completely connate +
tubular-prismatic +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
sessile +  and pedicellate +
fragrant +
upward-facing +
hollow +, solid +, branched +  and simple +
flattened +, terete +  and cordlike +
indehiscent +  and loculicidal +
woody;firm;cartilaginous +
Shallow water or very wet roadside ditches +
multicellular +
distinct +
cauline +  and basal +
scale-like +
distinct +
conspicuous +
rounded +
keeled +  and lanceolate +
6-angled +
4 cm40 mm <br />0.04 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
4 cm40 mm <br />0.04 m <br /> (18 cm180 mm <br />0.18 m <br />) +
differentiated +
7 cm70 mm <br />0.07 m <br /> (8.5 cm85 mm <br />0.085 m <br />) +
spreading-erect +  and erect +
reduced +
2 cm20 mm <br />0.02 m <br /> (?) +  and 3 cm30 mm <br />0.03 m <br /> (?) +
Flowering Mar–Apr. +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
heterogeneous +
tan;dark-brown +
conspicuously roughened +  and extensively corky +
4 +  and 20 +
d--shaped +
0.8 cm8 mm <br />0.008 m <br /> (?) +  and 1 cm10 mm <br />0.01 m <br /> (?) +
blue-purple +  and blue +
reflexed +  and spreading +
oval +  and orbicular-oval +
expanding +
4 cm40 mm <br />0.04 m <br /> (5 cm50 mm <br />0.05 m <br />) +
persisting +
elongated +
subequal +
15 cm150 mm <br />0.15 m <br /> (20 cm200 mm <br />0.2 m <br />) +
Illustrated +  and Endemic +
monochasial +
solid +  and 2-3-branched +
blue-violet +
3.5 cm35 mm <br />0.035 m <br /> (?) +  and 4 cm40 mm <br />0.04 m <br /> (?) +
Iris elephantina +, Iris hexagona var. giganticaerulea +  and Iris miraculosa +
Iris giganticaerulea +
Iris (sect. Limniris) ser. Hexagonae +
species +
connate +  and distinct +
scarious +
triangular +
spathaceous +  and more-flowered +
obscure;prominent +
hardened +  and papery +
unequal +