Flora of North America species comparison

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Cycloloma

cycloloma, pigweed, wing pigweed
Habit Herbs, annual, polygamomonoecious, villose or tomentulose, becoming glabrous at maturity.
Stems

erect, much branched, especially in inflorescence, not jointed, not armed, not fleshy.
Leaves

alternate, petiolate or almost sessile;

blade oblong-ovate, oblong, or lanceolate, base cuneate, margins sinuate-dentate, apex acute or mucronate.
Inflorescences

diffusely branched, paniculate, interrupted, linear spikes;

flowers solitary or few in axils of short bracts.
Flowers

bisexual or pistillate;

perianth segments 5, connate to above middle;

stamens 5;

stigmas 3.
Seeds

horizontal, ovate-lenticular or globose-lenticular;

seed coat black, smooth or indistinctly sculptured;

embryo annular, perisperm copious.
Fruiting

structure: connate perianth segments enclosing utricle, at maturity forming horizontal, membranous, circular wing;

pericarp membranous, free.
x

= 9.

Cycloloma
Distribution
from USDA
North America; occasionally adventive in South America and Europe
[BONAP county map]
Discussion

Species 1.

Traditionally, Cycloloma has been included in Chenopodieae (Chenopodiodeae). Recently it was placed in Camphorosmioideae (A. J. Scott 1978), mostly due to the presence of the broad wing formed by the encircling perianth segments. However, the development of the wing in Cycloloma seems to be very different from the mode of development of a similar wing (or other appendages) in Kochia, Bassia, and other genera of Camphorosmioideae. In my opinion, Cycloloma is more closely related to Chenopodium in the broad sense; the problem of its proper placement requires additional study.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 4, p. 264. Author: Sergei L. Mosyakin.
Parent taxa Chenopodiaceae
Subordinate taxa
C. atriplicifolium
Synonyms Cyclolepis
Name authority Moquin-Tandon: Chenop. Monogr. Enum., 17. (1840)
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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