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Persian knotweed, silver sheath knotweed

Habit Plants green, heterophyllous.
Stems

erect or decumbent, branched mostly from base, not wiry, 15–100 cm.

Leaves

ocrea 4–8 mm, proximal part cylindric, distal part soon disintegrating into curly or straight fibers;

petiole 0–1.5 mm;

blade bluish green, lanceolate or linear-lanceolate, 15–50 × 2–8 mm, margins flat, apex acute;

stem leaves 2.1–4 times as long as branch leaves;

distal leaves abruptly reduced and not overtopping flowers (shorter than or equaling flowers).

Inflorescence

axillary and terminal, spikelike;

cymes aggregated at tips of stems and branches, 4–6-flowered, bracts inconspicuous.

Pedicels

enclosed in ocreae, 1–2 mm.

Flowers

closed;

perianth 1.8–2.4 mm;

tube 10–22% of perianth length;

tepals overlapping, green or white, usually with pink, rarely red or white, margins, petaloid, not keeled, oblong to obovate, cucullate;

midveins usually unbranched;

stamens 7–8.

Achenes

enclosed in perianth, brown, ovate, 3-gonous, 1.3–2.3 mm, faces subequal, slightly concave, apex not beaked, with concave edges, shiny, smooth; late-season achenes unknown.

Polygonum argyrocoleon

Phenology Flowering May–Oct.
Habitat Fields, gardens, disturbed sites, often in saline soils
Elevation 0-1200 m (0-3900 ft)
Distribution
from FNA
AZ; CA; CO; FL; ID; LA; MA; MO; NC; NM; NV; TX; UT; VT; WV; c Asia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 5, p. 560.
Parent taxa Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Polygonum
Sibling taxa
P. achoreum, P. austiniae, P. aviculare, P. bidwelliae, P. bolanderi, P. californicum, P. cascadense, P. douglasii, P. engelmannii, P. erectum, P. fowleri, P. glaucum, P. heterosepalum, P. hickmanii, P. humifusum, P. majus, P. marinense, P. minimum, P. nuttallii, P. oxyspermum, P. paronychia, P. parryi, P. patulum, P. plebeium, P. polygaloides, P. ramosissimum, P. sawatchense, P. shastense, P. spergulariiforme, P. striatulum, P. tenue, P. utahense
Name authority Steudel ex Kunze: Linnaea 20: 17. (1847)
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