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Polygonum parryi
Greene
No occurrences found
Family:
Polygonaceae
Parry's knotweed
Images
not available
FNA
Resources
Mihai Costea, François J. Tardif, Harold R. Hinds+ in Flora of North America (vol. 5)
Herbs,
compact, often cushion-like.
Stems
erect, green-brown, simple or branched from base, not wiry, 2-5(-8) cm, glabrous.
Leaves
± uniformly distributed, dense, not articulated to ocreae, basal leaves ± persistent, distal leaves gradually reduced to bracts; ocrea 2-4(-5) mm, glabrous, proximal part cylindric, distal part deeply lacerate, disintegrating into white, curled fibers; petiole absent; blade 3-veined, without pleats, linear-lanceolate, subulate, 5-13(-20) × 0.4-1 mm, margins revolute, smooth, apex spine-tipped.
Inflorescences
axillary; cymes in most axils, 1-flowered.
Pedicels
absent.
Flowers
closed; perianth 1.5-2(-2.5) mm; tube 6-15% of perianth length; tepals overlapping, usually reddish with white margins, petaloid, oblong, navicular, apex acute; midveins unbranched; stamens 8.
Achenes
slightly exserted from perianth at maturity, dark brown, ovate, 1.2-1.6(-2) mm, faces subequal, shiny, smooth. Flowering May-July. Vernally moist, open, sandy or rocky places; 500-2000 m; Calif., Wash.
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