Iris hookeri

Penny ex G. Don

in J. C. Loudon, Hort. Brit. ed. 2, 591. 1832.

Common names: Beach-head iris iris de Hooker
IllustratedEndemic
Synonyms: Iris canadensis (Foster) Peckham Iris setosa var. canadensis Foster Iris setosa subsp. pygmaea C. E. Lundström
Treatment appears in FNA Volume 26. Treatment on page 381. Mentioned on page 373, 390.

Rhizomes many-branched, forming dense, cespitose clumps with many crowded fans with persistent old leaf-bases, 3–5 × 1.3–1.5 cm. Stems several to many from a single clump of fans, simple, 0.5–6 dm. Leaves: basal erect or strongly ascending, blade 1–5.2 dm × 0.5–1.4 cm; cauline 2–4, proximal 2–3 similar to basal leaves, distalmost leaf occasionally borne nearly midway on stem, clasping, blade bracteiform, lanceolate, 0.5–1.5 dm. Inflorescence units 1–2-flowered; spathes herbaceous, lanceolate to oblong-ovate, 2.5–6 cm, firm, outer spathe apex acute, inner similar or scarious at apex. Flowers: perianth deep to pale blue or blue-violet; floral-tube 0.5–0.75 cm; sepals broadly rounded, 2.5–4 cm wide, base strongly attenuate to claw, signal diffuse white basal patch; petals much reduced to insignificant, involute or tubular rudiments, 1–2 cm, apex with short bristle, mostly hidden by sepal bases; ovary green or flushed purple, acutely trigonal; style white with purple keel, 2–5 cm, crests overlapping, 2-lobed, subquadrate, margins coarsely serrate; stigmas rounded-triangular, margins entire; pedicel 2.5–4 cm. Capsules thin walled, trigonal, with rounded angles and grooved sides, 2–4 cm, apex blunt. Seeds in 2 rows per locule, dark-brown with prominent white raphe, compressed-pyriform, 4–6 mm, lustrous. 2n = 38.


Phenology: Flowering Jun–Jul.
Habitat: Grassy headlands, upper borders of beaches, dunes, and other coast formations, within reach of ocean spray

Distribution

V26 779-distribution-map.jpg

N.B., Nfld. and Labr., N.S., P.E.I., Que., Maine.

Discussion

Some authors still treat this taxon as Iris setosa var. canadensis, but others believe that it merits recognition as a separate species. I have seen I. hookeri flowering in its native habitat in both Nova Scotia and Prince Edward Island, and have examined dozens of herbarium specimens of both it and I. setosa, from which it is clearly distinct.

Selected References

None.

Lower Taxa

None.

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... more about "Iris hookeri"
dehiscing +  and latrorse +
Norlan C. Henderson +
Penny ex G. Don +
ascending +  and erect +
attenuate +
Iris subsect. Tripetalae +
lanceolate +
0.5cm;1.4cm +
additional +
cordlike +
enlarging +
2 cm20 mm <br />0.02 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Beach-head iris +  and iris de Hooker +
overlapping +
subquadrate +  and 2-lobed +
monochasial +
N.B. +, Nfld. and Labr. +, N.S. +, P.E.I. +, Que. +  and Maine. +
distinct or;partly completely connate +
hollow +  and solid +
ridged +  and terete +
0.5 cm5 mm <br />0.005 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
sessile +  and pedicellate +
fragrant +
upward-facing +
hollow +, solid +, branched +  and simple +
flattened +, terete +  and cordlike +
indehiscent +  and loculicidal +
woody;firm;cartilaginous +
Grassy headlands, upper borders of beaches, dunes, and other coast formations, within reach of ocean spray +
multicellular +
distinct +
cauline +  and basal +
scale-like +
distinct +
conspicuous +
triangular +  and rounded +
entire +  and serrate +
flushed purple +  and green +
6-angled +, 3-angled +  and terete +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
4 cm40 mm <br />0.04 m <br /> (18 cm180 mm <br />0.18 m <br />) +
differentiated +
reflexed +, spreading +  and erect +
insignificant +
reduced +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Jun–Jul. +
in J. C. Loudon, Hort. Brit. ed. +
many-branched +
3cm +  and 5cm +
heterogeneous +
1.3 cm13 mm <br />0.013 m <br /> (?) +  and 1.5 cm15 mm <br />0.015 m <br /> (?) +
tan;dark-brown +
conspicuously roughened +  and extensively corky +
4 +  and 20 +
compressed-pyriform +
reflexed +  and spreading +
rounded +
expanding +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
persisting +
lanceolate +  and oblong-ovate +
2.5 cm25 mm <br />0.025 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Illustrated +  and Endemic +
monochasial +
several +  and many +
rounded-triangular +
3-lobed +  and filiform +
2 cm20 mm <br />0.02 m <br /> (?) +  and 5 cm50 mm <br />0.05 m <br /> (?) +
Iris canadensis +, Iris setosa var. canadensis +  and Iris setosa subsp. pygmaea +
Iris hookeri +
Iris (sect. Limniris) ser. Tripetalae +
species +
connate +  and distinct +
scarious +
spathaceous +  and more-flowered +
obscure;prominent +
hardened +  and papery +
unequal +