Trillium vaseyi
Trillium pusillum
sweet beth, sweet trillium, sweet wakerobin, Vasey's trillium
dwarf trillium, dwarf wakerobin, least trillium, little trillium
short, stout, praemorse.
horizontal, branching, thin.
1–2 per rhizome terminus, round in cross section, 3–6.5 dm, ± slender to stout, glabrous.
1–2, round in cross section, 0.7–2 dm, slender, becoming taller and more robust after flowering, glabrous.
sessile to subsessile;
blade rhombic, 10–20 × 6–20 cm, often wider than long, not glossy, base attenuate, apex acuminate.
very short-petiolate, subsessile or sessile;
blade dark green with maroon undertones when young, not mottled, 3–5 major veins from base, oblong to lanceolate-obtuse, 2.5–8+ × 1–3 cm, not glossy, apex obtuse.
carried beneath bracts, odor faintly sweet;
sepals spreading, pale green, lanceolate-acuminate, 25–50 × 6–18 mm, margins involute, apex acuminate;
petals spreading to recurved distally, adaxially crimson, maroon-red, or brownish red, abaxially paler, grayish pink or rose, veins engraved, ovate-suborbicular, 3–6.5 × 4–6 cm, somewhat fleshy, base rounded and overlapping, margins entire, apex acute;
stamens conspicuous, ± erect to weakly recurved, 15–25 mm, longer than pistil at anthesis;
filaments grayish purple to blackish purple, longer than anthers, 5–12 mm, slender;
anthers weakly recurving, grayish purple to maroon, slender, dehiscence introrse;
connectives purple, barely equaling anther sacs;
ovary small, maroon or dark reddish purple, ± globose to conical-pyramidal, 6-ridged, 3–12 mm, basal attachment less than ovary width;
stigmas erect, recurved, distinct, gray-purple, not lobed adaxially, basally widened, ± linear distally, 2.5–6.5 mm, fleshy;
pedicel horizontal to declined-drooping, ± straight, 2–13 cm.
above bracts, erect, odorless to faintly sweet, pedicellate or sessile;
sepals conspicuous, spreading to same plane as petals, dark green with maroon undertones when young, oblong-lanceolate, 15–30 × 5–10 mm, margins entire, apex obtuse to strongly rounded;
petals of short duration, spreading-ascending, exposing stamens and ovary, weakly recurved in distal 1/2, white, aging to deep rosy pink abaxially, veins not engraved but major petal veins clearly visible, oblong to narrowly lanceolate, 1.5–3 × 0.5–1.5 cm, thin-textured, widest above base, margins strongly undulate, quite variable in petal width and degree of undulation between individuals and populations, apex obtuse to weakly acute;
stamens erect-spreading, 8–10 mm;
filaments pinkish purple to white, ± equaling or slightly shorter than anthers, slender;
anthers ± straight, pale lavender or yellow, 3–8(–10) mm, thicker than filaments, dehiscence introrse;
connectives not extended beyond anther sacs;
ovary conspicuous, white, ovoid, obscurely 6-angled, 2.5–8 mm, attachment narrower than ovary;
stigmas confluent with style, greenish white to white, distally 3-lobed, lobes linear (threadlike), long-spreading, 3–12 mm, uniformly thin and threadlike;
pedicel stiffly erect to leaning, 0.5–2 cm, or absent to much reduced.
dark reddish maroon, ovoid, obtusely angled, relatively small, 1–1.4 × 1–2 cm, pulpy.
white or pale greenish, ovate, 1–1.5 cm, pulpy, moist but not juicy.
= 10.
= 10.
Trillium vaseyi
Trillium pusillum
Although sometimes submerged within Trillium erectum, T. vaseyi has a later blooming season, a nodding flower of much larger size, a sweet fragrance, and cove habitat unlike that of T. erectum. In my garden hybridization experiments, T. vaseyi hybrids have different color patterns than T. erectum hybrids. Trillium vaseyi is clearly a distinct species. It frequently hybridizes with T. rugelii.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
Trillium pusillum comprises widely disjunct, regional populations, each varying somewhat from the others and variable within itself as well. Some of these populations have been named as varieties or separate species. In the wild, the plants that have been recognized as var. ozarkanum generally grow taller than others and are said to have bracts with five major veins instead of three. Plants attributed to var. texanum, on the other hand, are generally smaller in all parts, with narrower petals, and often revert to a single bract when not flowering. Only var. virginianum is easily distinguished at sight by its “sessile” flower. This variety has received extensive study. P. R. Cabe (1995), in a morphological study including statistical analysis, found variation within and between populations. He felt that his results were inconclusive, and also that some of the variation might be environmentally induced. The variation that he found did not correlate with a geographic pattern, and he suggested treating all Virginia populations as var. virginianum, or simply T. pusillum. In a later study, P. R. Cabe and C. R. Werth (1995), using isozyme evidence, obtained like results, and suggested treating all Virginia populations as a single variety pending further investigation. Until there has been such study, of the Virginia plants as well as the rest of the T. pusillum complex, I choose to retain the fairly distinctive and more or less traditionally known var. virginianum, and include all other populations in a broadly circumscribed var. pusillum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Flower pedicillate; pedicel usually 0.5–2 cm. | var. pusillum |
1. Flower sessile or subsessile; pedicel, if present, 0.1–0.3 cm | var. virginianum |
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