Jepson eFlora: Taxon page
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Trillium chloropetalum

Higher Taxonomy
Family: MelanthiaceaeView DescriptionDichotomous Key

Habit: Perennial herb, from rhizome or bulb, or rhizomes ending in weakly developed bulbs, scapose or not. Leaf: alternate, whorled, or mostly basal and spirally arranged, deciduous after 1 year or not. Inflorescence: raceme, panicle, or flowers 1. Flower: perianth parts 6, in 2 petal-like whorls or of sepals and petals, free or fused below, +- spreading; stamens 6, from perianth, anthers attached at base or near middle; ovary superior or partly inferior, chambers 3, styles 3, persistent. Fruit: capsule, loculicidal or septicidal.
Genera In Family: 10 genera, 130 species: northern hemisphere. Note: W North America Zigadenus moved to Toxicoscordion.
eFlora Treatment Author: Dale W. McNeal, except as noted
Scientific Editor: Dale W. McNeal, Thomas J. Rosatti.
Genus: TrilliumView DescriptionDichotomous Key

Habit: Rhizome short, thick, spreading to erect. Stem: erect, >=1 per rhizome. Leaf: 3, in 1 whorl subtending flower, sessile or subsessile, +- ovate. Inflorescence: flowers 1 per stem, erect to nodding, stalked or sessile. Flower: bisexual; sepals 3, free, persistent, +- green; petals 3, free, withering, white, +- pink, +- yellow, or purple; stamens 6; ovary chambers 3, styles 3. Fruit: capsule, +- berry-like. Seed: many, ovoid.
Species In Genus: +- 30--40 species: North America, Asia. Etymology: (Latin: 3, from leaves) Note: Trillium rivale moved to Pseudotrillium.
eFlora Treatment Author: Dale W. McNeal & Bryan D. Ness

Trillium chloropetalum (Torr.) Howell
Stem: 2--7 dm. Leaf: sessile, 7--21 cm, 7--18 cm wide, rounded to obtuse at tip, generally weakly +- brown-green-spotted. Flower: erect, sessile; odor generally sweet rose-like or +- spicy; sepals 3.5--6.5 cm, lanceolate; petals erect or leaning inward and +- concealing stamens, 6.5--10 cm, linear-oblanceolate to obovate, yellow to pink to dark purple, occasionally white; stamens 15--30 mm, tissue between anther sacs purple; ovary purple. Fruit: ovoid, obscurely 6-angled, red-purple, pulpy. Chromosomes: n=5.
Ecology: Edges of redwood forest, chaparral, generally moist slopes, canyon banks in alluvial soils; Elevation: 100--2000 m. Bioregional Distribution: NCoRI, SnFrB. Flowering Time: Apr--May Note: Highly variable; a population may contain many color variants.
Synonyms: Trillium chloropetalum var. giganteum (Hook. & Arn.) Munz
eFlora Treatment Author: Dale W. McNeal & Bryan D. Ness
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botanical illustration including Trillium chloropetalum


Citation for this treatment: Dale W. McNeal & Bryan D. Ness 2016. Trillium chloropetalum, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on February 09, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on February 09, 2016.

Trillium chloropetalum
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© 2007 Neal Kramer
Trillium chloropetalum
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© 2007 Neal Kramer
Trillium chloropetalum
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© 2007 Neal Kramer
Trillium chloropetalum
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© 2007 Neal Kramer
Trillium chloropetalum
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© 2002 Tony Morosco
Trillium chloropetalum
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© 2011 Julie Kierstead Nelson

More photos of Trillium chloropetalum in CalPhotos

Geographic subdivisions for Trillium chloropetalum:
Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.