Polygonum ramosissimum subsp. prolificum
Sida 20: 995. 2003.
Plants bluish green when fresh, dark-brown or black after drying, homophyllous. Stems 10–80 cm. Leaf-blades bluish green, oblanceolate, 8–30 (–35) × 4–6 mm, apex rounded or obtuse; stem-leaves 1–2.5 (–3.5) times as long as branch leaves; distal leaves overtopping flowers. Inflorescences axillary; cymes uniformly distributed or crowded toward tips of branches, 2–4-flowered. Pedicels enclosed in ocreae, 1–2 mm. Flowers: perianth 2–2.8 (–3) mm; tepal margins white or pink; stamens 3. Achenes enclosed in or exserted from perianth, 1.6–2 (–2.4) mm, shiny or dull, smooth, roughened, or obscurely tubercled; late-season achenes 4–10 mm. 2n = 60.
Phenology: Flowering Jul–Nov.
Habitat: Wet, saline places
Elevation: 0-2000 m
Alta., B.C., Man., Ont., P.E.I., Que., Sask., Ark., Calif., Conn., Del., Idaho, Ill., Iowa, Kans., Ky., La., Maine, Md., Mass., Minn., Miss., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Okla., Oreg., Pa., R.I., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wyo.
"/2" is not declared as a valid unit of measurement for this property.