Mollugo verticillata

Linnaeus

Sp. Pl. 1: 89. 1753

Common names: Carpet-weed mollugo verticillé green carpet-weed Indian chickweed mollugine
Treatment appears in FNA Volume 4. Treatment on page 510. Mentioned on page 11, 507.
Plants prostrate to ascending, 3–15 (–45) cm. Leaves not glaucous, in whorls of 3–8, basal rosette present, sometimes disappearing as plant matures; petiole 0.5–4 mm; blade linear to elliptic, obovate, or broadly spatulate, 5–40 × 0.5–15 mm, base cuneate, apex obtuse to rounded or acute. Inflorescences: flowers 2–6 in sessile, axillary umbels. Flowers: sepals green abaxially, white adaxially, oblong-elliptic, 1.5–2.5 × 0.5–1.2 mm, margins scarious; stamens 3[–4], alternate with carpels; pedicel erect-ascending at anthesis, erect to deflexed in fruit, 3–20 mm. Capsules ovoid-ellipsoid, 2.5–3.3 × 1.4–2.2 mm. Seeds 15–35, dark or reddish brown, with blackish, parallel, curved ridges on sides, or smooth, 0.5–0.6 × 0.4–0.5 mm. 2n = 64.

Phenology: Flowering summer–early fall.
Habitat: Weedy in fields, gardens, roadsides, moist to dry soils, sand
Elevation: 0-3000 m

Distribution

V4 1034-distribution-map.gif

B.C., Man., N.B., N.S., Ont., Que., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Vt., Va., Wash., W.Va., Wis., Wyo., Mexico, West Indies, Central America, South America, Eurasia, Africa.

Discussion

Some authors consider Mollugo verticillata a native of the New World tropics that spread northward into subtropical and temperate regions (M. L. Fernald 1950; H. A. Gleason and A. Cronquist 1991). If so, the species apparently spread very rapidly, because herbarium specimens exist from Ohio in 1828, Michigan in 1837, and Maine in 1837. J. Chapman et al. (1974) presented archaeological evidence of pre-Columbian presence of M. verticillata at a site in Tennessee.

Morphology and anatomy of the species are well studied. T. Holm (1911) investigated anisophyly in Mollugo verticillata and stated that the leaves are not “pseudo-verticillate,” as described by some earlier authors, but are truly opposite. M. A. Payne (1933, 1935) conducted morphologic and anatomic analyses of the leaf, stem, root, flower, and seed of the species. Pollen morphology was examined by N. Mitroiu (1971).

Several subspecific taxa have been described for Mollugo verticillata, but these are poorly understood; attempts to subdivide the species in North America for this treatment failed. The species is extremely morphologically variable, especially with regard to leaf shape, overall size, and habit. There seem to be no direct correlations between habitat type and morphology.

Mollugo verticillata possesses intermediate C3–C4 photosynthetic pathway characteristics, such as well- defined bundle-sheaths with numerous C4-like chloroplasts, distinct palisade and spongy parenchyma as in C3 plants, and intermediate light to dark ratios of CO2 evolution, which have made the species of particular interest in studies of the evolution and biochemistry of both photosynthetic pathways (R. A. Kennedy et al. 1980).

Lower Taxa

None.

Facts about "Mollugo verticillata"
AuthorMichael A. Vincent +
AuthorityLinnaeus +
Common nameCarpet-weed +, mollugo verticillé +, green carpet-weed +, Indian chickweed + and mollugine +
DistributionB.C. +, Man. +, N.B. +, N.S. +, Ont. +, Que. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +, Mexico +, West Indies +, Central America +, South America +, Eurasia + and Africa. +
Elevation0-3000 m +
HabitatWeedy in fields, gardens, roadsides, moist to dry soils, sand +
IllustrationPresent +
Illustration copyrightFlora of North America Association +
IllustratorBee F. Gunn +
PhenologyFlowering summer–early fall. +
Publication titleSp. Pl. +
Publication year1753 +
Referencepayne1933a + and payne1935a +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V4/V4 1034.xml +
SynonymsLampetia +
Taxon familyMolluginaceae +
Taxon nameMollugo verticillata +
Taxon parentMollugo +
Taxon rankspecies +
VolumeVolume 4 +