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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.
10 genera, 130 species: northern hemisphere. W North America Zigadenus moved to Toxicoscordion. —Scientific Editors: Dale W. McNeal, Thomas J. Rosatti.
Key to Melanthiaceae
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.Key to Trillium
± 30–40 species: North America, Asia. (Latin: 3, from leaves) [Farmer 2006 Aliso 22:579–592; Freeman 1975 Brittonia 27:1–62] Trillium rivale moved to Pseudotrillium.
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.
n=5. Edges of redwood forest, chaparral, generally moist slopes, canyon banks in alluvial soils; 100–2000 m. Inner North Coast Ranges, San Francisco Bay Area. [Trillium chloropetalum var. giganteum (Hook. & Arn.) Munz] Highly variable; a population may contain many color variants. Apr–May [Online Interchange]
Previous taxon: Trillium angustipetalum
Next taxon: Trillium ovatum
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Jul 29 2014
Citation for this treatment: [Author of taxon treatment] 2013. Trillium, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=47218, accessed on Jul 29 2014
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Jo-Ann Ordano © 2005 California Academy of Sciences
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