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giant trillium, sessile trillium

Leaves

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

apex rounded to obtuse, sessile.

Scapes

1–3 (rarely more), 20

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.

Fruits

ovoid to globose, green to maroon.

55 cm long.

Trillium albidum

Distribution
[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.

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