Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
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.



Dale W. McNeal, except as specified

Perennial to trees, from membranous bulb, fibrous corm, scaly rhizome, or erect caudex
Stem generally underground
Leaves generally basal, often withering early, alternate, generally ± linear
Inflorescence various, generally bracted
Flower generally bisexual, generally radial; perianth often showy, segments generally 6 in two petal-like whorls (outer sometimes sepal-like), free or fused at base; stamens 6 (or 3 + generally 3 ± petal-like staminodes), filaments sometimes attached to perianth or fused into a tube or crown; ovary superior or inferior, chambers 3, placentas generally axile, style generally 1, stigmas generally 3
Fruit: generally capsule, loculicidal or septicidal (berry or nut)
Genera in family: ± 300 genera, 4600 species: especially ± dry temp and subtropical; many cultivated for ornamental or food; some TOXIC. Here includes genera sometimes treated in Agavaceae, Amaryllidaceae, and other families.



Bryan D. Ness

Perennial; rhizome short, thick, horizontal to erect
Stem erect, 1 or more per plant
Leaves 3 in a single whorl, subtending flower, ± ovate
Flower bisexual, 1 per stem, erect to nodding; sepals 3, free, persistent, greenish; petals 3, free, withering, white, pinkish, yellowish, or purple; stamens 6; ovary chambers 3, styles 3
Fruit: capsule, berry-like
Seeds many, ovoid
Species in genus: ± 30–40 species: North America, Asia
Etymology: (Latin: three, from leaves)
Reference: [Freeman 1975 Brittonia 27:1–62]


T. angustipetalum (Torr.) J.D. Freeman

Stem 2–7 dm
Leaf subsessile, 9–25 cm, rounded to obtuse, sometimes lightly brown- or dark green-spotted
Flower generally with a musty or fetid odor; sepals 3–6.5 cm, oblong-lanceolate to linear-lanceolate; petals 5–11 cm, linear, dark purple; stamens 11–23 mm, tissue between anther sacs purple; ovary dark purple
Chromosomes: n=5
Ecology: Montane coniferous forest, foothill woodland, chaparral, riparian woodland
Elevation: 30–2000 m.
Bioregional distribution: w Klamath Ranges, Sierra Nevada (except Tehachapi Mountain Area), s Central Coast, Outer South Coast Ranges
Distribution outside California: s Oregon
Synonyms: T. chloropetalum (Torr.) Howell var. a. (Torr.) Munz; T. kurabayashii J.D. Freeman, Kurabayashi's wake-robin

Information on Distribution and elevation and ecology was contributed by Dave Keil (May 7 2003):
Trillium angustipetalum (TJM p. 1206) usually grows in riparian woodlands in San Luis Obispo county

previous taxon | next taxon
bioregional map for TRILLIUM%20angustipetalum being generated

Retrieve Jepson Interchange Index to Plant Names entry for Trillium angustipetalum
Retrieve dichotomous key for Trillium
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California