Flora of North America species comparison

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Polygonum cascadense

Cascade knotweed
Habit Herbs.
Stems

spreading to erect, zigzagged, green, simple or branched from base, wiry, 5–12(–15) cm, glabrous.
Leaves

uniformly distributed, articulated to ocreae, basal leaves persistent, distal leaves abruptly reduced to bracts;

ocrea 2–5 mm, glabrous, proximal part funnelform, distal part lacerate;

petiole essentially absent;

blade 1-veined, not pleated, oblanceolate to obovate, 5–20 × 2–5 mm, margins revolute, never touching along midrib, sparsely papillose-denticulate, apex rounded or apiculate.
Inflorescences

axillary and terminal, spikelike, dense;

cymes congested at tips of stems and branches, 3–5-flowered.
Pedicels

enclosed in ocreae, erect to spreading, 2–3 mm.
Flowers

open;

perianth 2–2.5 mm;

tube 12–25% of perianth length;

tepals overlapping, uniformly white, petaloid, oblong to obovate, cucullate, navicular in distal 1/4, apex rounded;

midveins unbranched;

stamens 8.
Achenes

enclosed in or exserted from perianth, black, ovate to ovate-oblong, 1.8–2.1 mm, faces subequal, shiny, smooth.

Polygonum cascadense
Phenology Flowering Jun–Sep.
Habitat Dry, usually rocky slopes, often on serpentine
Elevation 1600-1800 m (5200-5900 ft)
Distribution
from FNA
OR
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 5, p. 571.
Parent taxa Polygonaceae > subfam. Polygonoideae > Polygonum > sect. Duravia
Sibling taxa
P. achoreum, P. argyrocoleon, P. austiniae, P. aviculare, P. bidwelliae, P. bolanderi, P. californicum, 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 W. H. Baker: Madroño 10: 62, plate 1, fig. 1. (1949)
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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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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