Polygonatum biflorum
Polygonatum pubescens
giant Solomon's seal, King Solomon's-seal, smooth Solomon's sea, smooth Solomon's seal
hairy Solomon's-seal, sceau-de-salomon pubescent
deeply set, 1–3 cm thick.
shallowly set, 1–1.8 cm thick.
erect to arching, 5–20 dm; sheathing bract usually absent.
erect, 5–9(–11) dm; sheathing bract cauline, papery, caducous.
sessile to clasping, (5–)9–20(–25) × 3–9(–13) cm;
blade narrowly lanceolate to broadly elliptic, glabrous;
prominent veins 1–19.
subsessile or short-petiolate, 4–15 × 2–5.5(–7.5) cm;
blade elliptic-lanceolate to broadly ovate, glabrous adaxially, minutely hairy or pilose on abaxial veins;
prominent veins 3–9.
in most leaf axils except distal 2–3 and proximal 2–7;
peduncle flattened, not strongly reflexed, axillary 2–10(–15)-flowered, 6–9 cm in fruit.
in most leaf axils except distalmost and proximal 2–4;
peduncle sharply reflexed, axillary 1–3(–5)-flowered, to 2 cm in fruit.
perianth whitish to greenish yellow, tube (13–)17–22 mm, distinct tips gently spreading, 4–6.5 mm;
stamens inserted near middle of perianth tube;
filaments glabrous, sometimes minutely warty;
pedicel 1–4 cm in fruit.
perianth yellowish green, tube 10–13(–15) mm, distinct tips 2–3 mm;
stamens inserted high in perianth tube;
filaments densely warty;
pedicel to 1.3 cm in fruit.
8–12 mm.
6–9 mm.
= 20, 40.
= 20.
Polygonatum biflorum
Polygonatum pubescens
As a polyploid complex, Polygonatum biflorum is variable as to plant size, flower number, and ecology. Tetraploids, which have been recognized as var. commutatum, are usually larger and coarser than diploids, var. biflorum, with more flowers per peduncle and more major veins per leaf. They have also been called P. commutatum, P. giganteum, and P. canaliculatum (Mühlenberg) Pursh (misapplied). Some diploids, however, are fully as large as any tetraploids. Range-wide separation of species has been problematic (R. P. Ownbey 1944; E. G. Voss 1972–1985; J. A. Steyermark 1963; G. Yatskievych 1999+), while local distinction may be possible (M. L. Fernald 1944b; M. W. Richardson and D. Ugent 1974). Detailed molecular and enzymatic analysis at the population level is needed range-wide, in conjunction with karyological and morphological study.
Local populations of Polygonatum biflorum with honey-yellow flowers from southeastern Michigan and adjacent Ontario (E. G. Voss 1972–1985; R. P. Ownbey 1944) have been recognized as var. melleum. Disjunct populations in the trans-Pecos Texas and the mountains of Arizona and New Mexico have been called P. cobrense.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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