Trillium rivale |
Trillium petiolatum |
|
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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 | ||
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 | ||
Synonyms | Pseudotrillium rivale | |
Web links |