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green trillium, Ozark green trillium, Ozark trillium, tapertip wakerobin

great white trillium, large-flower trillium, trille grandiflore, white trillium, white wake-robin

Rhizomes

horizontal, brownish, short, thick, praemorse, not brittle.

short, thick, praemorse.

Scapes

1–3, round in cross section, 2–5 dm, ± stout, glabrous to scabrous.

(1–)2–3(–many), round in cross section, 1.5–3+ dm, thick, glabrous.

Bracts

touching ground in early anthesis or not at all, sessile;

blade dark green, obscurely marked with few–many darker blotches (very rarely unmottled), mottling becoming obscure with age, few or no stomates adaxially, ovate-elliptic to broadly so, 8.5–14 × 6.8–9 cm, apex acuminate.

sessile or subsessile (occasionally weakly cuneate basally);

blade dark green with maroon overtones early, ovate-rhombic, 12–20 × 8–15 cm, apex acuminate.

Flower

erect, odor, if present, spicy or musty;

sepals displayed above bracts, widely spreading, green or variously purple marked, lanceolate, 38–60 × 5–12 mm, margins entire, apex acute;

petals long-lasting, erect, ± connivent, ± concealing stamens and ovary, purplish black on claw, greenish to yellow-green distally, sometimes all dark purple, occasionally slightly twisted, linear to narrowly spatulate, 4–8 × 0.8–1.2 cm, thick-textured, base slightly thickened and clawed, margins entire, apex rounded, lacking nipple;

stamens erect, connivent (clustered together, leaning upon each other), 16–25 mm;

filaments olive or purplish brown, 2.5–5 mm, very slender, widened basally;

anthers erect, straight or slightly incurved, olive-brown, 13–20 mm, ± slender, dehiscence latrorse;

connectives brownish, barely extending beyond anther sacs;

ovary pale greenish white basally, purplish distally, ovoid, 6-angled, 5.5–10 mm;

stigmas erect, divergent-recurved, distinct, purplish abaxially, sessile, almost linear, 6–10 mm, ± equaling ovary, ± not fleshy, very slightly widened basally.

outfacing, erect, odorless;

sepals spreading, flat, green, very rarely streaked with maroon-purple, lanceolate, 20–55 × 12–23 mm, margins entire, apex acuminate or acute;

petals erect basally, recurving somewhat above middle to produce strongly funnelform corolla, obscuring ovary and base of style, white or rarely pink, without V-shaped or other markings, fading to dull pinkish purple, veins of adaxial surface conspicuous but not appearing engraved, shape variable, lanceolate to oblong, obovate, or, rarely, suborbicular, sides often parallel, 4–7.5 × 2–4 cm, thin-textured, base abruptly attenuate, margins overlapping basally, rolled, undulate-wavy in distal 1/2, apex ± acuminate;

stamens straight or barely recurved, 9–27 mm;

filaments white, much shorter than anthers, relatively thin;

anthers recurving slightly, pale yellow, strongly yellow when pollen exposed, long, 5–16 mm, slender, dehiscence introrse;

ovary inconspicuous, pale green or white, ovoid, 6-angled, 8–18 mm, basal attachment narrower than ovary width;

style barely united for 0.5–2 mm or merely closely grouped and separate;

stigmas erect, becoming spreading, weakly connate basally, pale green-white, uniformly linear, 3–18 mm, equaling or exceeding ovary, slender;

pedicel erect-ascending to strongly erect, 2–8+ cm.

Fruits

dark purplish green or green, odor unreported, ovoid, obscurely angled, with remains of persistent stigma, 0.7–1.5 cm, pulpy, not juicy at time of separation from receptacle.

pale green, odorless, ± globose, obscurely 6-angled, 1.2–1.6 × 0.8–1.4 cm, mealy, moist (not juicy).

2n

= 10.

Trillium viridescens

Trillium grandiflorum

Phenology Flowering spring (early Apr–mid May). Late spring–early summer (Apr–Jun).
Habitat Deciduous forests, usually quite rich, on banks, bluffs, talus slopes, floodplain alluvium, with cane (Arundinaria) or on sloping banks just above normal flood levels in heavy, clayey soils, with common spring ephemerals Rich deciduous or mixed coniferous-deciduous upland woods, floodplains, roadsides
Elevation 100–400 m (300–1300 ft) 20–700 m (100–2300 ft)
Distribution
from FNA
AR; KS; MO; OK; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
CT; DE; GA; IA; IL; IN; KY; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; PA; SC; TN; VA; VT; WI; WV; NS; ON; QC
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

J. D. Freeman (1975) considered that Trillium viridescens intergrades with T. gracile in northeastern Texas and stated that these putative intergrades produce purple petals, but purple-petaled forms also occur in Arkansas, far from the influence of T. gracile.

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

Most variants of Trillium grandiflorum have green stripes or markings on the petals, many with numerous (4–30+) extra petals and/or bracts, and, often, much-deformed, monstrous characteristics. G. R. Hooper et al. (1971) showed that mycoplasmic organisms were present in all such forms examined, and were absent from normal plants. Most such forms should not be named taxonomically but, unfortunately, many have been. Nearly all of those that I examined represented stages in the development of the mycoplasma infection. Trillium grandiflorum, unlike most trilliums, produces many-petaled “double” forms. Forma roseum Farwell, opening a striking clear salmon-pink, occurs very rarely throughout the range, but is frequent in mixed or pure colonies along the Blue Ridge Mountains of Virginia.

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

Source FNA vol. 26, p. 117. FNA vol. 26.
Parent taxa Liliaceae > Trillium > subg. Phyllantherum Liliaceae > Trillium > subg. Trillium
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. 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. 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. 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
Synonyms T. rhomboideum var. grandiflorum, T. erythrocarpum
Name authority Nuttall: Trans. Amer. Philos. Soc., n. s. 5: 155. (1837) (Michaux) Salisbury: Parad. Lond. 1: plate 1. (1805)
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