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brook trillium, brook wakerobin

Trillium ovatum

western trillium

Leaves

1.7–11 cm × 0.8–6 cm, blue-green; glossy; leathery;

apex acute to acuminate;

base lanceolate to cordate;

petioles (0.5)1– 3(6) cm.

Scapes

1–2, 4–20 cm, glabrous.

Flowers

pedicel 2-10 cm;

sepals 3, green, lanceolate or ovate to oblong, 10–23 × 4–8(11)mm;

margins entire;

apex rounded to apiculate;

petals erect to spreading; ovate-cordate to orbicular, 1.3–2.8(3) × (0.8)1–2.4 cm, white, usually with dark purple spots;

base rounded to cuneate;

margins entire;

apex apiculate to acuminate;

veins inconspicuous or sometimes with pale venation;

stamens 6–15 mm; erect;

filaments white;

anthers straight, 3–6 mm, yellow;

ovary ovoid, 3–9 × 4 mm, white to cream, weakly 6-angled;

stigmas recurved, 2–4 mm, white to cream.

Fruits

globose; greenish white.

Trillium rivale

Trillium ovatum

Distribution
[WildflowerSearch map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Stream banks, talus slopes, forest clearings, generally in serpentine soils. Flowering Mar–Jul. 50–1300m. CR, Sisk. CA. Native.

This species is sometimes placed in its own monotypic genus, Pseudotrillium.

Source Flora of Oregon, volume 1, page 316
Tamra Prior
Sibling taxa
T. albidum, T. cuneatum, T. kurabayashii, T. ovatum, T. petiolatum
T. albidum, T. cuneatum, T. kurabayashii, T. petiolatum, T. rivale
Subordinate taxa
T. ovatum ssp. ovatum
Synonyms Pseudotrillium rivale
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