7.
Chenopodium rubrum
Linnaeus, Sp. Pl. 1: 218. 1753.
Red pigweed, red goosefoot, coast-blite
Stems
erect to ascending or prostrate, much-branched, 0.1-6(-8) dm, glabrous.
Leaves
non-aromatic; petiole 0.05-0.45 cm; blade triangular to rhombic, 1-9 × 1-6 cm, base cuneate, margins dentate or entire, apex obtuse to acute.
Inflorescences
lateral glomerules sessile on lateral branched spikes; glomerules subglobose, 2-5 mm diam.; bracts linear, 0.4-2 cm.
Flowers:
perianth segments 3 or 4, usually connate only at base; lobes lanceolate to elliptic, 0.8-1 × 0.4-0.8 mm, membranaceous, apex broadly acute to rounded, occasionally deeply retuse, rounded or occasionally keeled, glabrous, green and covering fruit at maturity; stamens 2-3; stigmas 2, 0.1 mm.
Utricles
ovoid; pericarp nonadherent, reticulate-punctate.
Seeds
vertical and occasionally horizontal, ovoid, 0.6-1(-1.2) mm diam., margins rounded; seed coat reddish brown, smooth.
2
n
= 18.
Varieties 2 (2 in the flora): North America, Europe.
