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brook trillium, brook wakerobin

petioled wakerobin, round-leaved 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.

round or ovate to elliptic, 7–14 × 5.5– 10.2 cm, green, not mottled, not glossy;

apex round or obtuse;

petioles 5–17 cm.

Scapes

1–2, 4–20 cm, glabrous.

usually 1, 4–20 cm, glabrous, generally subterranean (occasionally vertical).

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.

sessile;

sepals oblong-elliptic to oblanceolate, 20–45 × 7–10 mm, green;

margins entire;

apex acute;

petals erect to incurved, linear-lanceolate, 3–5.5 × 0.4–1 cm; light maroon-red or purple, sometimes yellow to greenish;

margins entire;

apex acute;

stamens erect; (15)22–30 mm;

filaments (3)5–7 mm, dark green;

anthers 16– 20 mm, purple-brown to dark green;

ovary ovoid, 4–9 mm, white to greenish; purplish distally;

stigmas erect, 7–20 mm.

Fruits

globose; greenish white.

ovoid.

Trillium rivale

Trillium petiolatum

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.

Seasonally wet places, conifer and mixed forests, near streams and rivers. Flowering Apr–Jun. 400–1900m. BW, Lava. ID, WA. Native.

Source Flora of Oregon, volume 1, page 316
Tamra Prior
Flora of Oregon, volume 1, page 315
Tamra Prior
Sibling taxa
T. albidum, T. cuneatum, T. kurabayashii, T. ovatum, T. petiolatum
T. albidum, T. cuneatum, T. kurabayashii, T. ovatum, T. rivale
Synonyms Pseudotrillium rivale
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