Comments
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Stenanthium gramineum shares molecular affinities with the Zigadenus densus (Desrousseaux) Fernald and Z. leimanthoides A. Gray species pair (W. B. Zomlefer et al. 2001).
The varieties of Stenanthium gramineum recognized by M. L. Fernald, but not here, are indistinct and sympatric (R. R. Gates 1918; R. G. Johnson 1969). The disjunct upper Michigan localities represent locally established waifs (E. G. Voss 1972–1985, vol. 1).
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Bulbs slender, ellipsoid, 3–8 cm. Stems 5–20 dm. Leaves numerous, ascending; blade narrowly linear, channeled, 20–70 × 0.5–3 cm, apex acuminate to obtuse. Inflorescences freely branching, terminal panicles of many compound racemes; terminal racemes longer than lateral; bracts linear, 2 mm. Flowers erect; perianth rotate; tepals not recurved distally, white to greenish yellow, narrowly lanceolate, 4–10 × 1–2 mm, apex acute to narrowly acuminate; tepal glands absent; stamens 1–4 mm; filaments equal; pedicel divergent, 4–6 mm. Capsules oblong, cylindric to ovoid, 6–10 mm including divergent style beaks. Seeds brown, ellipsoid to lanceoloid, 5–8(–10) mm. 2n = 20.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Distribution
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Ala., Ark., D.C., Fla., Ga., Ill., Ind., Ky., La., Md., Mich., Mo., N.C., Ohio, Pa., S.C., Tenn., Tex., Va., W.Va.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Flowering/Fruiting
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Flowering mid--late summer.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat
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Moist woods, thickets, and meadows; 0--1200m.
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Synonym
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Helonias graminea Ker Gawler, Bot. Mag. 39: plate 1599. 1813; Stenanthium gramineum var. micranthum Fernald; S. gramineum var. robustum (S. Watson) Fernald; S. robustum S. Watson
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA