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Fernald's iris

coast iris, long-petal iris

Rhizomes

many-branched, producing dense clumps, compact, slender, ca. 0.6 cm diam., base covered with remains of old leaves;

roots fibrous.

with short, creeping branches, stout, 2–2.5 cm diam., covered with bases of old leaves;

roots numerous, fleshy.

Stems

simple, solid, 2–4 dm.

simple or 1–2-branched, solid, 3–6 dm.

Leaves

basal with blade gray-green, usually brilliantly colored basally, drying to unusual gray-green, veins fairly prominent, to 4 dm × 0.7–0.8 cm, often quite glaucous, margins not thickened;

cauline 2–several, spreading, sheathing stem for about 1/2 length, foliaceous, blade not inflated.

basal persistent, blade dark green, turning gray or yellow-brown when drying, veins not prominent, linear, 4–7 dm × 0.6–1 cm, usually longer than stem, glaucous or subglaucous, apex acute;

cauline 2–3, reduced.

Inflorescence units

2-flowered;

spathes opposite, connivent, often flushed red basally, broadly lanceolate, 5–9 cm × 6–11 mm, subequal.

3–6-flowered;

spathes distant, inner sometimes 10 cm distal to outer, green, narrowly linear-lanceolate, 8–15 cm × 20–40 mm, herbaceous, margins and apex scarious.

Flowers

perianth pale creamy yellow with gold or gray veins;

floral tube funnelform, 3–6.2 cm, spreading apically to form wide throat;

sepals horizontally spreading, claw with deep yellow median line, oblanceolate to spatulate, 4.5–7 × 1–2 cm, base gradually attenuate into broad claw;

petals narrowly oblanceolate, 4.3–6 × 0.6–1.4 cm, base gradually attenuate into narrow claw;

ovary elliptical, nearly circular in cross section, 1.5–2.3 cm;

style 2.2–3 cm, crests divergent, linear to narrowly oblong, 1–1.7 cm;

stigmas triangular, margins entire;

pedicel 0.9–2.2 cm at anthesis.

perianth pale blue-violet or nearly white, with lilac-purple veins;

floral tube funnelform, 0.5–1.3 cm;

sepals spreading, then drooping at apex, white, flecked and veined with violet, obovate, 8–10 × 3–5 cm, base attenuate into narrow claw with prominent yellow ridge, signal a yellowish basal patch;

petals semierect, oblong, 8–9 × 1.5–2 cm, base gradually attenuate, apex emarginate, bluntly rounded;

ovary trigonal with central ridge in each face, 2–5 cm;

style narrow basally, widening distally, 3.5–4 × 0.6–1 cm, crests overlapping basally, subquadrate, 1–1.5 cm, margins incised;

stigmas obscurely to prominently 2-lobed, margins crenate;

pedicels stout, 3–9 cm, unequal at anthesis, becoming ± equal at maturity.

Capsules

oblong, roundly trigonal, distinctly beaked, 2.5–3.5 cm.

6-ribbed, oblong-ovoid, tapering to either end, almost round in cross section, 8–9 cm.

Seeds

dark brown, wrinkled.

dark brown, globular, wrinkled.

2n

= 40.

= 86, 88.

Iris fernaldii

Iris longipetala

Phenology Flowering Apr–Jul. Flowering Mar–Apr.
Habitat Mixed evergreen forest Wet, heavy soil along coast
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Iris fernaldii hybridizes with I. douglasiana, I. innominata, and I. macrosiphon.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Iris longipetala hybridizes with I. missouriensis and is found from Mendocino County south to Monterey.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 26, p. 387. FNA vol. 26, p. 389.
Parent taxa Iridaceae > Iris > subg. Limniris > sect. Limniris > ser. Californicae Iridaceae > Iris > subg. Limniris > sect. Limniris > ser. Longipetalae
Sibling taxa
I. bracteata, I. brevicaulis, I. chrysophylla, I. cristata, I. douglasiana, I. fulva, I. germanica, I. giganticaerulea, I. hartwegii, I. hexagona, I. hookeri, I. innominata, I. lacustris, I. longipetala, I. macrosiphon, I. missouriensis, I. munzii, I. orientalis, I. pallida, I. prismatica, I. pseudacorus, I. pumila, I. purdyi, I. savannarum, I. setosa, I. sibirica, I. tenax, I. tenuis, I. tenuissima, I. tridentata, I. verna, I. versicolor, I. virginica
I. bracteata, I. brevicaulis, I. chrysophylla, I. cristata, I. douglasiana, I. fernaldii, I. fulva, I. germanica, I. giganticaerulea, I. hartwegii, I. hexagona, I. hookeri, I. innominata, I. lacustris, I. macrosiphon, I. missouriensis, I. munzii, I. orientalis, I. pallida, I. prismatica, I. pseudacorus, I. pumila, I. purdyi, I. savannarum, I. setosa, I. sibirica, I. tenax, I. tenuis, I. tenuissima, I. tridentata, I. verna, I. versicolor, I. virginica
Name authority R. C. Foster: Iridis Sp. Nov., 1. (1938) Herbert: in W. J. Hooker and G. A. W. Arnott, Bot. Beechey Voy., 395. (1840)
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