Cycloloma

Moquin-Tandon

Chenop. Monogr. Enum., 17. 1840.

Common names: Winged pigweed
Etymology: Greek cyclos, ring, circle, and loma, border
Basionym: Cyclolepis Moquin-Tandon Ann. Sci. Nat., Bot., sér. 2, 1: 203, pl ate 9, fig. A. 1834,
Treatment appears in FNA Volume 4. Treatment on page 264. Mentioned on page 260, 265.
 TaxonIllustrator 
FNA4 P43 Cycloloma atriplicifolium.jpegCycloloma atriplicifolium
Beta vulgaris subsp. vulgaris
Dysphania chilensis
Bee F. Gunn
Yevonn Wilson-Ramsey
Yevonn Wilson-Ramsey

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. Fruiting structure: connate perianth segments enclosing utricle, at maturity forming horizontal, membranous, circular wing; pericarp membranous, free. Seeds horizontal, ovate-lenticular or globose-lenticular; seed-coat black, smooth or indistinctly sculptured; embryo annular, perisperm copious. x = 9.

Distribution

North America, occasionally adventive in South America and Europe

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.

Selected References

None.

... more about "Cycloloma"
mucronate +  and acute +
Sergei L. Mosyakin +
Moquin-Tandon +
slippery +
aromatic +
cuneate +
Cyclolepis +
lanceolate +, oblong +  and oblong-ovate +
persistent +  and deciduous +
reddish-brown +, black +, brown +  and green +
Winged pigweed +
North America +  and occasionally adventive in South America and Europe +
Greek cyclos, ring, circle, and loma, border +
interrupted +  and branched +
sessile +  and petiolate +
not winged +  and winged +
lobed +  and serrate-dentate +
inferior +, half-inferior +  and superior +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
Chenop. Monogr. Enum., +
pointing +  and ascending +
basal +, median +  and position +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
sculptured +  and smooth +
reddish-brown +, brown +  and black +
globose-lenticular +  and ovate-lenticular +
cylindric +
not armed +, not jointed +  and branched +
opposite +  and alternate +
not fleshy +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Cycloloma +
Chenopodiaceae +
glabrous +, tomentulose +  and villose +
polygamomonoecious +
membranous +