Guilleminea densa (humb. & Bonpl. ex Schult.) Moq.

Small matweed (en)

Species

Angiosperms > Caryophyllales > Amaranthaceae > Guilleminea

Characteristics

Prostrate or sometimes decumbent, mat-forming perennial herb with a rootstock considerably thickened for up to ± 5 cm. below the ground and then abruptly more slender, mat from ± 7–70 cm. across.. Stems numerous from the base, much-branched, branches opposite (of alternate by reduction of one of the pair), ± densely white-lanate.. Leaves variable in size and shape, the lamina narrowly elliptic to broadly ovate, mostly 5–22 × 1.5–14 mm., acute to subacute at the apex, rapidly narrowed below to a broad petiole up to ± 8 mm. long, glabrous or subglabrous on the upper surface, ± densely lanuginose with long, matted, white hairs on the lower surface, especially when young.. Inflorescences dense, ovoid, of up to ± 10 flowers, whitish, to ± 6 mm. long, the axis long-pilose; lower flowers frequently minutely pedicellate below the bract, the upper sessile.. Bracts hyaline, very delicate and concave, ± 1.5–2 mm., frequently splitting with age, glabrous, persistent; bracteoles similar but slightly shorter.. Tepals united for about half their length, densely sinuose-lanuginose, the lobes very delicate, hyaline except for a pale, firmer midrib, whole perianth ± 2–2.5 mm. long at maturity.. Staminal tube completely adnate to the perianth-tube, the filaments indicated only by short, triangular teeth; anthers very small, ± 0.25 mm., ovoid.. Ovary ellipsoid, firm only at the extreme tip.. Style very short, ± 0.25 mm.. Capsule ellipsoid, ± 1–1.25 mm.. Seed compressed-ellipsoid, ± 1 mm. chestnut-brown, faintly reticulate.. Fig. 28.
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Perennial herb; pubescent. Stems procumbent or decumbent; much branched; many. Leaves opposite; blade narrowly elliptic to broadly ovate, variable in size, 5-22 x 1.5-14.0 mm, decurrent, apex acute, margins entire, upper surface glabrous or subglabrous, lower surface densely hairy with long, matted white hairs. Flowers: inflorescences dense glomerules in leaf axils, up to 5 mm in diameter; perianth white; Nov.-May.
Leaves variable in size and shape, the lamina narrowly elliptic to broadly ovate, mostly 5–22 × 1.5–14 mm., acute to subacute at the apex, rapidly narrowed below to a broad petiole up to c. 8 mm. long, glabrous or subglabrous on the upper surface, more or less densely lanuginose with long, matted, white hairs on the lower surface, especially when young.
Perennial herb, 0.3-2.0 m high, prostrate or decumbent, mat-forming. Inflorescences sessile, axillary, dense bracts persistent, subequal, silvery, ± ovate. Flowers bisexual, minute, solitary in axils of bracts; bracteoles 2; perianth and bracteoles falling with fruit. Flowering time Nov.-Apr. Seed compressed, firm.
A herb. It is a woolly plant and forms mats. It lies along the ground. The mats spread about 70 cm across. It has a thickened rootstock and stems branch from the base. The leaves are narrowly oval and smooth on the upper surface but with white woolly hairs underneath. The flowers are dense oval and whitish.
Prostrate or sometimes decumbent, mat-forming perennial herb with a rootstock considerably thickened for up to c. 5 cm. below the ground and then abruptly more slender, mat from c. 7–70 cm. across.
Inflorescences dense, ovoid, of up to c. 10 flowers, whitish, to c. 6 mm. long, the axis long-pilose; lower flowers frequently minutely pedicellate below the bract, the upper sessile.
Tepals united for about half their length, densely sinuose-lanuginose, the lobes very delicate, hyaline except for a pale, firmer midrib, whole perianth c. 2–2.5 mm. long at maturity.
Pubescent, perennial, prostrate or decumbent herb. Leaves opposite, spathulate. Inflorescences dense glomerules up to 5 mm in diameter, in leaf axils. Flowers white.
Bracts hyaline, very delicate and concave, c. 1.5–2 mm. long, frequently splitting with age, glabrous, persistent; bracteoles similar but slightly shorter.
Staminal tube completely adnate to the perianth tube, the filaments indicated only by short, triangular teeth; anthers very small, c. 0.25 mm., ovoid.
Stems numerous from the base, much-branched, branches opposite (or alternate by reduction of one of the pair), more or less densely white-lanate.
Ovary ellipsoid, firm only at the extreme apex; style very short, c. 0.25 mm. long.
Seed c. 1 mm. long, compressed-ellipsoid, chestnut-brown, faintly reticulate.
Capsule c. 1–1.25 mm. long, ellipsoid.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention -
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.3 - 2.0
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

It is a tropical plant. It grows in open disturbed sites near roads. It can grow on gravels and sand. It grows between 400-1,600 m altitude. It can grow in arid places. In Argentina it grows from sea level to 3,000 m above sea level.
Light -
Soil humidity 1-3
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 6-11

Usage

Uses food medicinal
Edible leaves
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Guilleminea densa leaf picture by Gisela Salvatierra Soñanes (cc-by-sa)

Distribution

Guilleminea densa world distribution map, present in Angola, Argentina, Australia, Bolivia (Plurinational State of), Botswana, Colombia, Ecuador, Lesotho, Mexico, Mozambique, Mauritius, Namibia, Peru, Paraguay, United States of America, South Africa, Zambia, and Zimbabwe

Identifiers

LSID urn:lsid:ipni.org:names:1183159-2
WFO ID wfo-0000711753
COL ID 3HL7D
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Achyranthes conferta Brayulinea australis Brayulinea densa Illecebrum densum Gossypianthus australis Guilleminea australis Guilleminea illecebroides Guilleminea illecebrum Achyranthes conferta Guilleminea densa var. densa Guilleminea densa