Flora of North America species comparison

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Polygonum bidwelliae

Bidwell knotweed, Bidwell's knotweed
Habit Herbs.
Stems

erect, green, simple or divaricately branched, ± wiry, 2–20 cm, minutely papillose-scabridulous.
Leaves

crowded at branch tips, not articulated to ocreae, basal leaves caducous or persistent, distal leaves abruptly reduced to bracts;

ocrea 8–13 mm, papillose-scabridulous, proximal part cylindric, distal part overlapping and obscuring leaves and flowers, silvery, entire or shallowly dentate;

petiole absent;

blade 3-veined, without pleats, linear, 5–15(–20) × 0.5–1.5(–2) mm, margins revolute, papillose-denticulate, apex spine-tipped.
Inflorescences

axillary;

cymes in distal axils, 1-flowered.
Pedicels

absent.
Flowers

closed;

perianth 2–3 mm;

tube 10–18% of perianth length;

tepals overlapping, pink with pink or white margins, petaloid, elliptic, navicular, apex acute to acuminate;

midveins unbranched;

stamens 8.
Achenes

enclosed in perianth at maturity, light brown to brown, ovate-elliptic, 1.8–2.3 mm, faces subequal, shiny, smooth.

Polygonum bidwelliae
Phenology Flowering May–Jun.
Habitat Thin volcanic soils, chaparral, montane woodland valleys, grasslands
Elevation 60-1200 m (200-3900 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Polygonum bidwelliae occurs in the Cascade Range and northeastern Sacramento Valley in Butte, Shasta, and Tehama counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 565.
Parent taxa Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia
Sibling taxa
P. achoreum, P. argyrocoleon, P. austiniae, P. aviculare, 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 S. Watson: Proc. Amer. Acad. Arts 14: 294. (1879)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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