Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

IRIDACEAE

IRIS FAMILY

Elizabeth McClintock, except as specified

Perennial, bulbed, cormed, or rhizomed
Stem generally erect
Leaves generally basal (a few cauline), 2-ranked, ± linear, generally grass-like, generally sharply folded along midrib; bases overlapping, sheathing
Inflorescence: spike, raceme, panicle, ± terminal, or flowers solitary; bracts ± like leaf bases, sheathing
Flower generally bisexual, generally radial; hypanthium fused to ovary; perianth parts generally fused into tube above ovary, generally petal-like, in 2 series of 3, outer (sepals) generally ± like inner (petals); stamens 3, generally attached to sepals, filaments fused below into a tube or not; ovary inferior, 3-chambered, placentas generally axile, style 1, each of 3 branches entire or 2-branched or -lobed, petal-like or not, with stigma on under surface instead of at tip
Fruit: capsule, loculicidal
Seeds few–many
Genera in family: 80 genera, ± 1500 species: worldwide, especially Africa; many cultivated (e.g., Iris, Gladiolus, Crocus, Freesia ).

IRIS

IRIS

Douglass M. Henderson and Anita F. Cholewa

Perennial; rhizome creeping or ± tuber-like
Inflorescence: flowers 1–many
Flower: perianth parts clawed, sepals (wider, spreading or reflexed) unlike petals (generally narrower, erect); style branches ± petal-like, arching over stamens, each with flat, scale-like stigma on surface facing stamen, just below generally 2-lobed tip (crest)
Seeds compressed, pitted
Species in genus: Perhaps 150 species: generally n temp
Etymology: (Greek: rainbow, from flower colors)
Reference: [Lenz 1958 Aliso 4:1–72; Clarkson 1959 Madroño 15:115–122]
Hybrids are common, especially in I. tenax alliance; some authors lump taxa recognized here.
Horticultural information: Pacific Iris hybrids; CVS.

Native

I. tenuissima Dykes

Rhizome < 10 mm diam
Leaf < 6 mm wide
Inflorescence: flowers 2; lowest 2 bracts opposite, outermost 3.5–10 cm, 5–10 mm wide
Flower: perianth tube 30–58 mm, throat distinct, sepals 4.7–7.5 cm, 11–18 mm wide; style branches 20–30 mm, crests 9–23 mm, stigmas triangular to rounded or tongue-shaped
Ecology: Common. Dry, open woodlands
Elevation: 100–2000 m.
Bioregional distribution: Northwestern California, Cascade Range, n High Sierra Nevada, Sacramento Valley.

Native

subsp. purdyiformis (R.C. Foster) L.W. Lenz


Stem: leaves 3–4, bract-like, free only at tips, generally flushed with pink
Flower: perianth pale yellow or cream with few or no dark veins; stigmas widely triangular to rounded
Ecology: Shaded places, yellow-pine forests
Elevation: ± 600–2000 m.
Bioregional distribution: se Klamath Ranges (Shasta Co.), Cascade Range, n High Sierra Nevada
Horticultural information: DRN, DRY: 6, 17 &SHD: 7, 15: DRN, IRR: 1, 2, 8, 9, 14, 16, 18.

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