Flora of North America species comparison

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Koenigia

knotweed, koenigia
Habit Herbs, annual; taprooted.
Stems

decumbent, ascending, or erect, glabrous.
Leaves

cauline, alternate or subopposite, petiolate;

ocrea persistent, chartaceous;

blade spatulate-ovate to orbiculate, margins entire.
Inflorescences

terminal, paniclelike or cymelike, not pedunculate.
Pedicels

absent or present.
Flowers

bisexual, 3–10 per ocreate fascicle, bases not stipelike;

perianth nonaccrescent, greenish, often tinged white or pink distally, narrowly campanulate, glabrous or occasionally with scattered glands;

tepals 3 [4], distinct, sepaloid, monomorphic;

stamens (1–)3[–5];

filaments distinct, free, glabrous;

anthers white or yellowish, ovate to elliptic;

styles 2(–3), erect, distinct;

stigmas capitate.
Achenes

included or barely exserted, light brown or brown to black, unwinged, unevenly 2-gonous, rarely 3-gonous, glabrous.
Seeds

embryo curved.
x

= 7.

Koenigia
Distribution
from USDA
Alpine; arctic; and circumpolar; n North America; s South America; n Europe; e Asia
[BONAP county map]
Discussion

Species 6 (1 in the flora).

The five other species of Koenigia are endemic to high mountains of southeastern Asia, primarily the Himalayas (O. Hedberg 1997). K. Haraldson (1978) and L.-P. Ronse Decraene and J. R. Akeroyd (1988) placed Koenigia close to Aconogonon based on morphological data. Preliminary molecular data seem to support that relationship (A. S. Lamb Frye and K. A. Kron 2003).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 600. Authors: John G. Packer, Craig C. Freeman.
Parent taxa Polygonaceae > subfam. Polygonoideae
Subordinate taxa
K. islandica
Name authority unknown: Mant. Pl. 1: 3, 35. (1767): Syst. Nat. ed. 12, 2: 71, 104. (1767)
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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