Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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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. chrysophylla Howell

YELLOW-FLOWERED IRIS

Rhizome < 10 mm diam
Stem < 2 dm
Leaf 3–5 mm wide
Inflorescence: flowers 2; lowest 2 bracts opposite, outer of these 5–8.6 cm, < inner, 6–10 mm wide
Flower: perianth pale creamy yellow to ± white, sometimes with faint bluish tinge, generally with darker veins, tube 43–120 mm, throat indistinct (tube generally with a short, bowl-shaped enlargement near top), sepals 4.6–6.7 cm, 10–20 mm wide; style branches 17–25 mm, crests 15–25 mm, stigmas triangular
Chromosomes: 2n=40
Ecology: UNCOMMON. Open coniferous forests
Elevation: ± 600–1000 m.
Bioregional distribution: w&s Klamath Ranges
Distribution outside California: w Oregon
Horticultural information: DRN: 4, 5, 6 &IRR: 17 &SHD: 1, 2, 3, 7, 14, 15, 16, 18, 19, 20, 21.

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