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MELANTHIACEAE FALSE-HELLEBORE FAMILY

Dale W. McNeal, except as noted

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

PSEUDOTRILLIUM

1 sp.: California, Oregon. (Like Trillium) [Farmer 2006 Aliso 22:579–592]

P. rivale (S. Watson) S.B. Farmer BROOK WAKEROBIN
NATIVE
Stem: 0.5–2 dm. Leaf: 3, in 1 whorl subtending flower, petioled (subsessile), blade 1.7–11 cm, lanceolate to cordate, acute to acuminate, leathery. Inflorescence: flowers 1 per stem; peduncle generally erect as flower opens, becoming recurved and continuing to elongate below bracts after pollination until ovary contacts soil. Flower: bisexual; sepals 1–2 cm, 4–11 mm wide, lanceolate or ovate to oblong; petals 1.5–3 cm, 0.8–1.9 cm wide, ovate-cordate, white (pink), generally purple-spotted; stamens 6, 6–15 mm; ovary chambers 3 stigmas 3, recurved. Fruit: capsule, berry-like, ± pulpy, rarely dehiscent, generally shed as a unit.
n=5. Yellow-pine forest along rocky streambanks and in Darlingtonia bogs, generally serpentine; 40–1500 m. Klamath Ranges; southwestern Oregon. [Trillium rivale S. Watson] Apr–Jun [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Dec 20 2014
Citation for this treatment: [Author of taxon treatment] 2013. Pseudotrillium, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=82514, accessed on Dec 20 2014

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click for enlargement Pseudotrillium rivale
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2007 Shawn DeCew

Geographic subdivisions indicated for the distribution of Pseudotrillium rivale 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.
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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).

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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.