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giant trillium, sessile trillium

giant purple wakerobin

Leaves

ovate to broadly ovate, 6–20 × 5–15 cm, with weak mottling; spots often fading, not glossy;

apex rounded to obtuse, sessile.

ovate to broadly ovate; (9)11–18(25) × (8)12–17 cm, bright green, usually with prominent light and dark green spots, occasionally lightly mottled with mottling fading with age; somewhat glossy;

apex acuminate, sessile.

Scapes

1–3 (rarely more), 20

2, 25–55 cm, glabrous.

Flowers

sessile;

sepals lanceolate, 15–65 × 4–15 mm, green;

margins entire;

apex acute;

petals erect or slightly spreading, linear to obovate, 2–8 × 0.5–3 cm, white to cream-colored;

base sometimes rose pink to purple, rarely entire petal purple;

base often cuneate;

apex rounded to acute;

margins entire;

stamens erect, 10–25 mm;

filaments 1–4 mm, white to greenish white;

anthers erect, 10–20 mm, yellow or greenish white;

ovary ovoid, green or sometimes purple;

stigmas erect to spreading, 3–7 mm.

sessile;

sepals oblong- to lance-linear, 3.5–6(7.5) × 1–1.5 cm, green with purple streaks;

margins entire;

apex acute to round-acute;

petals maroon, spreading-erect to erect, linear to oblanceolate, 5.5–11 × 2–3.5 cm; maroon;

base cuneate;

apex round-acute;

margins entire;

stamens erect; (11)15–26 mm;

filaments 2–4 mm, dark purple;

anthers 13–24 mm; dark maroon;

ovary ovoid, dark purple, rounded or with 6 angles;

stigmas erect, 6–8 mm.

Fruits

ovoid to globose, green to maroon.

ovoid to ellipsoid; dark reddish purple.

55 cm long.

Trillium albidum

Trillium kurabayashii

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

2 subspecies.

The two subspecies of T. albidum are known to hybridize where their ranges overlap. This hybrid is sometimes referred to as T. × oregonum.

Along streams, meadows, forests, found often with oak trees. Flowering Mar–May. 0–1500m. Est, Sisk. CA. Native.

Source Flora of Oregon, volume 1, page 314
Tamra Prior
Flora of Oregon, volume 1, page 315
Tamra Prior
Sibling taxa
T. cuneatum, T. kurabayashii, T. ovatum, T. petiolatum, T. rivale
T. albidum, T. cuneatum, T. kurabayashii, T. ovatum, T. petiolatum, T. rivale
Subordinate taxa
T. albidum ssp. albidum, T. albidum ssp. parviflorum
Synonyms Trillium chloropetalum Trillium angustipetalum, Trillium chloropetalum
Web links