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Trillium ovatum

Pacific trillium, trillium, western trillium, western wake-robin, western white trillium, white or western trillium, white trillium

Chattahoochee River wakerobin, deceiving trillium

Rhizomes

semierect to horizontal, short, stout, praemorse.

horizontal, brownish, thick, praemorse, not brittle.

Scapes

1–2, round, 2–5 dm, ± slender, glabrous.

1–3, green or bronze-green, round in cross section, 1.7–4.4 dm, stout, glabrous.

Bracts

sessile, subsessile, or short-petiolate;

blade medium green, sometimes blotched and mottled, main veins prominent, ovate-rhombic, 7–12 × 5–20 cm, continuing to expand during anthesis, base rounded, apex acuminate.

held horizontally, not drooping, tips at anthesis held well above ground, sessile;

blade usually very strongly marked with at least 3 shades of dark green, bronze green, and purplish green, often with light central strip, mottling becoming obscure with age, ovate-lanceolate to lanceolate, widest at ca. 1/3 of length from basal attachment, tapered very gradually to tip, 8–17+ × 4.9–8.5 cm, rounded basally, margins of distal 1/3 straight, apex acute.

Flower

erect or nodding, odorless;

sepals spreading to horizontal, green, lanceolate to oblong-lanceolate, 15–50 × 6–20 mm, margins entire, apex acute;

petals erect-ascending, usually wide-spreading from base, exposing entire pistil, white or with pink or blush markings, lacking V-shaped markings, fading to rosy pink, purple, or dark red, veins not deeply engraved, ± linear to widely obovate, 1.5–7 ×1–4 cm, widest at or above middle, thin-textured, margins flat to undulate, apex acuminate;

stamens prominent, slightly recurved-spreading to straight, 10–18 mm;

filaments white, shorter than anthers, slender;

anthers yellow, 4–16 mm, slender, dehiscence latrorse-introrse;

ovary green or white, ovoid, 6-angled, 5–12 mm, attachment ± 3/4 ovary width;

stigmas recurved, barely connate basally, greenish white or white, linear, not lobed adaxially, 6–10 mm, uniformly thin;

pedicel erect to leaning, 2–6 cm.

faintly ill-scented;

sepals divergent-ascending, streaked with green to maroon, lanceolate to ovate-lanceolate, 36–68 × 12–21 mm, margins entire, flat or slightly raised adaxially, apex acute;

petals long-lasting, erect, ± connivent, ± partially concealing stamens and ovary, maroon-purple, brownish purple to brown, greenish streaked to green, rarely yellow, becoming brown, or occasionally bright copper-bronze with age, not spirally twisted, veins not engraved, obovate to oblanceolate, large in proportion to leaf size compared to many species, 5–9 × 1–2 cm, 2+ times longer than wide, widest at or just above middle, thick-textured, margins entire, flat, apex acute, obtuse, or rounded;

stamens erect or incurving, 12–24 mm;

filaments yellow, 2–3 mm;

anthers erect, straight, rarely arcuate, yellow, 10–15 mm, dehiscence latrorse;

connectives straight, projecting 1–2 mm beyond anther sacs;

ovary dark red, brown, or gray, ellipsoid, strongly 6-angled, 6–13 mm;

stigmas basally erect, tips recoiled upon ovary, distinct, green, white, or purple, linear, short, 3–12 mm, slightly thickened basally, not fleshy.

Fruits

baccate, green or white, ± odorless, broadly ovoid, obscurely winged, 1.2–2.8 × 0.7–1.9 cm, pulpy-moist.

baccate, dark green to purple, odor not reported, ellipsoid, strongly grooved and ridged, pulpy or mealy.

2n

= 10.

= 10.

Trillium ovatum

Trillium decipiens

Phenology Flowering winter–mid spring (late Jan–early Apr).
Habitat Rich woods and bluffs in mixed deciduous forests of oak, red maple, beech, elm, and others, also thinner upland oak woods, in depressions and in ravines, low sandy-alluvial slopes to local rivers
Elevation 50–100 m (200–300 ft)
Distribution
from USDA
w North America
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; FL; GA
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Bracts sessile; petals lanceolate to obovate, 1.5–7 × 1–4 cm
var. ovatum
1. Bracts distinctly short-petiolate; petals linear to linear-lanceolate, 0.5–2.4 × 0.2–0.6 cm
var. oettingeri
Source FNA vol. 26, p. 100. FNA vol. 26, p. 108.
Parent taxa Liliaceae > Trillium > subg. Trillium Liliaceae > Trillium > subg. Phyllantherum
Sibling taxa
T. albidum, T. angustipetalum, T. catesbaei, T. cernuum, T. chloropetalum, T. cuneatum, T. decipiens, T. decumbens, T. discolor, T. erectum, T. flexipes, T. foetidissimum, T. gracile, T. grandiflorum, T. kurabayashii, T. lancifolium, T. ludovicianum, T. luteum, T. maculatum, T. nivale, T. parviflorum, T. persistens, T. petiolatum, T. pusillum, T. recurvatum, T. reliquum, T. rivale, T. rugelii, T. sessile, T. simile, T. stamineum, T. sulcatum, T. underwoodii, T. undulatum, T. vaseyi, T. viride, T. viridescens
T. albidum, T. angustipetalum, T. catesbaei, T. cernuum, T. chloropetalum, T. cuneatum, T. decumbens, T. discolor, T. erectum, T. flexipes, T. foetidissimum, T. gracile, T. grandiflorum, T. kurabayashii, T. lancifolium, T. ludovicianum, T. luteum, T. maculatum, T. nivale, T. ovatum, T. parviflorum, T. persistens, T. petiolatum, T. pusillum, T. recurvatum, T. reliquum, T. rivale, T. rugelii, T. sessile, T. simile, T. stamineum, T. sulcatum, T. underwoodii, T. undulatum, T. vaseyi, T. viride, T. viridescens
Subordinate taxa
T. ovatum var. oettingeri, T. ovatum var. ovatum
Name authority Pursh: Fl. Amer. Sept. 1: 245. (1814) J. D. Freeman: Brittonia 27: 17, fig. 3. (1975)
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