Trillium nivale
Trillium cernuum
dwarf white trillium, snow trillium, snow wakerobin
nodding trillium, nodding wakerobin, trille penché, whip-poor-will-flower
short, praemorse.
short, thick.
usually 1, 6-gonal in cross section, 0.3–0.5 dm at onset of anthesis, expanding to 0.45–0.8 dm, slender, glabrous.
1–2(–3), round in cross section, 1.5–4+ dm, slender, glabrous.
distinctly petiolate;
blade bluish green, elliptic-ovate to ovate, 1.5–4.5 cm × 0.7–34 mm, base abruptly rounded to petiole, apex round-obtuse.
often overlapping, sessile or with a barely noticeable, petiolelike base, umbrellalike;
blade bright green without red tones, broadly rhombic-ovate to suborbicular, 5–15 × 6–15+ cm, base attenuate, apex acuminate.
erect, fragrance sweet;
sepals spreading, flat, bluish green, lanceolate, 10–32 × 2–7 mm, shorter than petals, margins entire, apex obtuse;
petals very showy, recurved to erect-spreading, white, veins not engraved on adaxial surface, ovate-elliptic to oblong, 1.5–3.5+ × 0.8–1.5 cm, thin- to firm-textured, margins entire to slightly wavy, apex obtuse-acuminate;
stamens straight, 5–18 mm;
filaments white, slightly shorter than anthers, slender;
anthers straight, pale yellow, 2.5–11 mm, thin, dehiscence introrse;
ovary greenish white, ± globular, obtusely 3-angled;
style with tips spreading, elongate, 0.5–1.5 mm, slender;
stigmas prominent, recurved or curled, connate basally, white, linear, threadlike, 4–12+ mm;
pedicel erect in anthesis, rapidly recurving below leaves after pollination, 5–20 cm.
usually hidden beneath bracts, nodding, odorless;
sepals spreading, green, lanceolate-ovate, 9–30 mm, slightly shorter than to equaling petals, margins slightly raised, apex acuminate;
petals usually strongly recurved from above base, extending behind plane of sepal bases for more than 1/2 their length, white or rarely pale pink, adaxial veins not conspicuous, oblong-lanceolate, 1.5–2.5 × 0.9–1.5 cm, thin-textured, margins entire, apex acuminate;
stamens ± straight, 6–15 mm, shorter than pistil, slender;
filaments white, ± equaling anthers, slender;
anthers straight, pale lavender-pink or -gray, 2–6.5 mm, dehiscence introrse to latrorse;
ovary prominent, white to pinkish, pyramidal, strongly 6-angled, 3–12 × 3–10 mm, widest above basal attachment;
stigmas erect, recurved, distinct, white, not lobed adaxially, 3–8 mm, widest at base, fleshy, basally thickened, gradually tapered;
pedicel strongly recurved or declined below or angled between bracts, 1.5–3 cm.
greenish white, odorless, globose-ovate, 0.6–1 × 0.5–0.8 cm, pulpy, not juicy.
dark red, with fruity fragrance, ovoid, to 3 cm diam., fleshy, juicy.
= 10.
= 10.
Trillium nivale
Trillium cernuum
Trillium nivale occurs primarily at the southern edge of Pleistocene glaciation and shuns humus, leaf deposits, and much plant competition.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Previous authors commonly recognized var. cernuum and var. macranthum, based primarily upon size differences. Plants attributed to var. cernuum are found from Delaware and eastern Pennsylvania northward to Newfoundland, while those attributed to var. macranthum are found mainly farther inland into the Midwest. Although there is a tendency for the eastern seaboard plants to be somewhat smaller and more delicate, and the midwestern and far northern plants to be more robust, there is much variation, largely dependent on soil nutrients. There are regional size trends, but based on my observations of this species in Newfoundland, Michigan, Wisconsin, and Minnesota, I do not believe that the two varieties can be maintained.
In the Gray Herbarium, there is a collection by Richardson labeled “Mackenzie River,” which has been cited by H. M. Raup (1947) and others. W. J. Hooker ([1829–]1833–1840) reported Trillium cernuum “from Saskatchewan to Mackenzie River.” Raup stated that “it is the only evidence for the occurrence of...Trillium in the entire Mackenzie Basin.” Other writers have simply quoted that statement. In view of the relatively great disjunction from the known Saskatchewan stations and in the absence of any other supporting specimens from that area, I believe that there might be locality error on the Richardson sheet. However, it is not beyond possibility that T. cernuum could occur there. This apparent disjunct station is not mapped here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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