Jepson Flora Project: Jepson Interchange    

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

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



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 ).



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.


I. missouriensis Nutt.


Rhizome 20–30 mm diam
Stem 2–5 dm, sometimes branched
Leaf 3–9 mm wide; base sometimes purplish
Inflorescence: flowers 1–2; lowest 2 bracts opposite, generally scarious, outermost 4–8 cm, 5–7 mm wide
Flower: perianth pale lilac to whitish with lilac-purple veins, tube < 12 mm, sepals < 6 cm, 2 cm wide; style branches < 25 mm, crests averaging 8 mm, stigmas 2-lobed
Chromosomes: 2n=38
Ecology: Moist, grassy places
Elevation: 900–3400 m.
Bioregional distribution: North Coast Ranges, Sierra Nevada, Inner South Coast Ranges, Transverse Ranges, Peninsular Ranges, Great Basin Floristic Province
Distribution outside California: much of w N.America, n Mexico
Flowering time: May–Jun
Horticultural information: IRR: 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 14, 15, 16, 18, 19, 20, 21.

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