Trillium chloropetalum |
Trillium viridescens |
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giant purple wakerobin, giant trillium, giant wakerobin, sessile trillium, small-flower trillium |
green trillium, Ozark green trillium, Ozark trillium, tapertip wakerobin |
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Rhizomes | ± erect, brownish, somewhat compressed-thickened, superficially bulblike, praemorse, not brittle. |
horizontal, brownish, short, thick, praemorse, not brittle. |
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Scapes | 1–3, green, round in cross section, 2–6.5 dm, robust. |
1–3, round in cross section, 2–5 dm, ± stout, glabrous to scabrous. |
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Bracts | held well above ground, sessile (narrowing of bract blade may give bract subsessile appearance); blade densely to weakly mottled in dark brownish green, mottling becoming more obscure to absent as bract matures, broadly ovate, 7–17.6 × 7.4–17.7 cm, not glossy, apex obtuse-rounded. |
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. |
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Flower | erect, odor roselike, spicy; sepals spreading-ascending above bracts, green, lanceolate, 35–65 × 7–12 mm, margins entire, flat, apex obtusely rounded; petals long-lasting, erect, connivent, ± concealing stamens and ovary, yellow, bronze, maroon, brown, deep purple, reddish brown, pink, dark purplish red, purplish bronze, rarely greenish white, not spirally twisted, veins not engraved, oblanceolate to obovate, 6.5–10 × 1.5–2.5 cm, thick-textured, base cuneate, margins entire, apex variably acute to almost truncate, erose; stamens erect, purplish, 17–26 mm; filaments purple, ca. 4 mm, widest at base, much shorter than anther sacs; anthers erect, straight, ± purple-brown, 13–22 mm, dehiscence introrse; connectives purple, straight, extended ca. 1–1.5 mm beyond anther sacs; ovary purple, ovoid, 6-angled, 6–12 mm; stigmas small, divergent or erect, distinct, purple, subulate, 4–8 mm, not fleshy. |
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. |
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Fruits | red-purple, fragrance not reported, ovoid, obscurely 6-angled, 2.5–3 cm, pulpy, juicy. |
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. |
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2n | = 10. |
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Trillium chloropetalum |
Trillium viridescens |
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Phenology | Flowering spring (early Apr–mid May). | |||||
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 | |||||
Elevation | 100–400 m (300–1300 ft) | |||||
Distribution |
CA
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AR; KS; MO; OK; TX
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Discussion | Varieties 2 (2 in the flora). J. D. Freeman (1975) considered that Trillium chloropetalum differs from T. albidum in having introrse (not latrorse) anther sacs, and that the purple pigments present on anther and ovary tissue here are absent in T. albidum. In some places, hybridization between the two certainly has occurred, and a complete range of intergrades exists. This species merits further study. The following varieties are only weakly differentiated and perhaps ought to be dropped. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
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Key |
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Source | FNA vol. 26. | FNA vol. 26, p. 117. | ||||
Parent taxa | Liliaceae > Trillium > subg. Phyllantherum | Liliaceae > Trillium > subg. Phyllantherum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | T. sessile var. chloropetalum, T. giganteum var. chloropetalum | |||||
Name authority | (Torrey) Howell: Fl. N.W. Amer., 661. (1902) | Nuttall: Trans. Amer. Philos. Soc., n. s. 5: 155. (1837) | ||||
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