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Mollugo verticillata

(Green Carpet-Weed)

Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in Chinese:

Zhong Leng Su Mi Cao

Common Names in English:

Carpet Weed, Carpet-Weed, Carpetweed, Green Carpet-Weed, Green Carpetweed, Indian Chickweed, Indian-Chickweed, Mollugine

Common Names in French:

Mollugine, Mollugo Verticillé

Description

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Family Molluginaceae

Herbs annual or perennial , subshrubs , or shrubs , rarely dioecious, glabrous or rarely hairy . Stems erect or prostrate . Leaves simple , alternate, rarely opposite, often in a basal rosette or in pseudowhorls on stems, margin entire; stipules absent or membranous. Inflorescences terminal or in seemingly axillary cymes, rarely as a solitary flower. Flowers bisexual , rarely unisexual , actinomorphic , hypogynous, rarely perigynous. Tepals 5, rarely 4, free or connate below into a tube , lobes white or pink to purple, sometimes yellow inside (in Glinus) . Petals absent or few to many, white, pink, or purple. Stamens 3-5 or many, arranged in several rings , free or connate at base in bundles; anthers dehiscing by longitudinal slits. Ovary superior, syncarpous (in Gisekia developmentally syncarpous; fruit a deeply lobed schizocarp) ; carpels 2-5 or many, placentation axile , rarely seemingly basal. Stigmas as many as locules. Ovules 1 to many per locule. Fruit usually a loculicidal capsule or deeply (3-) 5-15-lobed mericarps (in Gisekia), rarely breaking into 2 nutlets [in Limeum Linnaeus, not in Flora area]. Seeds with embryo curved around a hard, starchy perisperm .

About 14 genera and 120 species: arid , tropical and subtropical regions of both hemispheres; three genera and eight species in China.

The relationships of the anomalous genus Gisekia are uncertain. In the past, Gisekia has been included in Aizoaceae, often together with Molluginaceae. Recent treatments offer either a placement in Phytolaccaceae (e.g. , Rohwer in Kubitzki, Fam. Gen. Fl. Pl. 2: 511, 514. 1993) or in a family of its own, Gisekiaceae (e.g., Gilbert, Kew Bull . 48: 343–356. 1993) ; one of us (Hartmann) favors either option. The mericarpic fruit separates the genus from Aizoaceae and Molluginaceae, from which it differs also by the presence of betalain and the absence of anthocyanin as pigments. No currently accepted plant family contains both anthocyanin and betalain producers.[1]

Genus Mollugo

Herbs, annual [perennial ], glabrous . Stems prostrate to erect , branching from base . Leaves whorled , opposite, or alternate; basal leaves usually largest, cauline leaves gradually reduced distally; stipules absent or rudimentary . Inflorescences axillary or terminal , reduced umbellate or cymose . Flowers pedicellate ; sepals persistent , 5, distinct , not stellate-pubescent; petals absent; stamens 3-5, alternate with the sepals or carpels, basally connate by a small hypogynous ring ; pistils 3-5-locular; ovules 5-15 per locule; styles 3-5, distinct. Fruits capsular , 3-valved. Seeds: flattened laterally, reniform , smooth or reticulate to ribbed , strophioles absent. x = 9.

Species 35: North America, West Indies, Central America, South America, Europe, Asia, Africa, Australia.

Although Mollugo has little economic value, some species have been used medicinally or as vegetables. Mollugo spergula, which has been used in India as a green vegetable, contains bitter triterpenoid saponins and sometimes is used as a source of antiseptics (A. K . Barua et al. 1989) and has been used also as a potherb (A. K. Tripathi 1988). Antifungal compounds have been isolated from Mollugo pentaphylla (M. Hamburger et al. 1989).

The taxonomy of species of Mollugo is in great disarray, and the genus is in need of a thorough worldwide revision .[2]

Physical Description

Species Mollugo verticillata

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. [source]

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. [source]

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). [source]

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. [source]

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). [source]

Habit: Forb/herb

Flowers: Bloom Period: May, June, July, August. • Flower Color: near white, white

Size/Age/Growth

Size: under 6" tall.

Habitat

Weedy in fields , gardens, roadsides, moist to dry soils, sand; 0-3000 m [3].

Typically found at an altitude of 0 to 2,382 meters (0 to 7,815 feet).[4]

Biology

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Reproduction

Duration: Annual

Growth

Sunlight: Sun Exposure: Full Sun .

Moisture: Drought Tolerance: High

Taxonomy

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Unambiguous Synonyms

  1. Mollugo berteriana Ser.

Notes

Name Status: Accepted Name . Latest taxonomic scrutiny: 15-Mar-2000

Place of publication : Sp. pl. 1:89. 1753

Name verified on 12-Mar-2004 by ARS Systematic Botanists. Last updated: 12-Mar-2004

Similar Species

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Members of the genus Mollugo

ZipcodeZoo has pages for 84 species, subspecies, varieties, forms, and cultivars in this genus:

M. angustifolia · M. araucana · M. arenaria · M. bellidifolia · M. berterana · M. berteroana · M. brevipes · M. caespitosa · M. cambessedesii · M. cerviana (Thread-Stem Carpet-Weed) · M. chevalieri · M. costata · M. crockeri · M. cubensis · M. cuneifolia · M. decandra · M. deltoidea · M. denticulata · M. dichotoma · M. disticha · M. enneandra · M. erecta · M. flavescens · M. floriana · M. fragilis · M. glinoides · M. glinus · M. glomerata · M. gracillima (Slender Carpetweed) · M. herniarioides · M. herniarioioes · M. hirta · M. hoffmannseggiana · M. insularis · M. juncea · M. leiosperma · M. linearis · M. linkii · M. lotoides · M. malabarica · M. marginata · M. maritima · M. minuta · M. molluginea · M. molluginis · M. mudicaulis · M. multiflora · M. namaquensis · M. novo-hollandica · M. nudicaulis (Naked-Stem Carpet-Weed) · M. nudicaulis var. navassensis · M. oppositifolia · M. orygioides · M. parviflora · M. patens · M. pentaphylla (Mollugo) · M. pinosia · M. pumila · M. pusilla · M. radiata · M. reflexa · M. schrankii · M. serrulata · M. setiflora · M. snodgrassii · M. spergula · M. sperguloides · M. striata · M. stricta · M. subserrata · M. suffruticosa · M. sumatrana · M. tenella · M. tenuissima · M. tetraphylla · M. trifolia · M. trigastrotheca · M. triphylla · M. umbellata · M. venticillata · M. verticellata · M. verticillata (Green Carpet-Weed) · M. verticillate · M. walteri

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal November 14, 2007:

Identifiers

Footnotes

  1. Dequan Lu & Heidrun E. K. Hartmann "Molluginaceae". in Flora of China Vol. 5 Page 437. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Mollugo". in Flora of North America Vol. 4 Page 76, 509, 510. Oxford University Press. Online at EFloras.org. [back]
  3. "Mollugo verticillata". in Flora of North America Vol. 4 Page 11, 507, 510,. Oxford University Press. Online at EFloras.org. [back]
  4. Mean = 255.990 meters (839.862 feet), Standard Deviation = 420.910 based on 1,377 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/1/2009