Eleutheranthera ruderalis (Sw.) Sch.Bip.

Ogiera (en)

Species

Angiosperms > Asterales > Asteraceae > Eleutheranthera

Characteristics

Erect or sprawling herbs to 30 cm tall; stems glabrate to pilose. Leaves opposite, ovate, mostly 3(-8 mm) long, apically acute or acuminate, basally obtuse, acute or acuminate, the margins entire or crenulate-dentate, 3-veined from near the base, both sides pubescent with verrucose hairs and glandular; petiole slender, less than 1/3 the length of the leaf. Inflorescence a terminal aggregate of 2-5 heads, the subtending leaves not reduced; pedicels slender, pilose, often longer than the head. Heads discoid, 4-6 mm long; involucral bracts in two series of 4-5 each, the outermost slightly imbricate, ovate, apically acuminate or acute, often mucronulate, green, ciliate, dorsally pubescent on the lower portion, ventrally on the apical portion with copious sessile glandular excrecences, the midvein impressed ventrally, slightly elevated dorsally, with two inconspicuous veins running parallel and close to the margin, some of them exceeding the flowers, the innermost receptacular or paleaceous, folded from the costa to partially enclose the florets, apically green, acuminate, ciliate; florets 2-6, 4-5 mm long, somewhat arched, the corolla 2.5 mm long, campanulate, the tube short, the limb apically 5-lobed, the lobes ventrally pilose, yellow, basally hardly expanded, the stamens 5, the anthers black, the upper 'A4 free, the appendages rudimentary, the anther collar thickened, prominent, the anthers basally auriculate, the adjacent auricles mostly connate, the style branches lanceolate, conspicuously dorsally pubescent, the stigmatic surface confined to two lateral ridges on the lower 3/4, the apical 1/4 flattened and thinner, the nectary coroniform, 0.25 mm long, the ovary laterally flattened, 3-angled, evenly and finely puberulent, contracted above the locule and expanded into a pilose, coroniform pappus not exceeding the nectary. Achene 3 mm long, brown, the pericarp buff colored, prominently tuberculate, especially along the ribs and near the apex with dark brown umbonate tubercules, sparingly pubescent with weak spreading white hairs; pappus an apical peg, dark brown and white-pubescent on top.
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Erect or semiprostrate, slightly aromatic herb (10–) 20–75 cm high; stems slender, pilose. Leaves ovate to oblong-lanceolate, 15–50 (–65) mm long, 7–20 (–35) mm wide, pilose on both surfaces and minutely glandular-punctate especially below; petioles 10–12 (–20) mm long. Capitula 5 mm diam. in flower (10 mm in fruit), nodding at maturity; peduncles 2–8 (–25) mm long; involucral bracts oblong or ovate-oblong, 7–9 mm long, obtuse, hispid with long hairs, minutely glandular-punctate; paleae linear, semiclasping, acute to acuminate, scarious, green and ciliate at tip. Florets 4–6; corollas pale yellow; lobes minutely ciliate internally. Achenes weakly 4-angled, 2.5–3 mm long, stramineous to light brown, usually tuberculate when mature, sparingly and minutely pubescent, particularly on rostrum.
Herbs, erect, to 30 cm. Stems glabrate to pilose. Petiole 1-2 cm; leaf blade ovate, 3(-8) cm, 3-veined from near base, both surfaces pubescent and glandular, base obtuse, acute, or acuminate, margin entire or crenulate-dentate, apex acute or acuminate. Synflorescence terminal, of 2-5 capitula; peduncles slender, pilose, usually longer than capitulum. Capitula discoid, 4-6 mm; phyllaries 2-seriate, outer slightly imbricate, ovate, abaxially pubescent toward base, margin ciliate, apex acuminate or acute, inner paleaceous and involute around florets. Florets 2-6, ca. 2.5 mm; anthers black; style branches lanceolate, pubescent abaxially. Achenes brown, ca. 3 mm, 3-angled, body tuberculate, sparsely setuliferous; pappus an apical peg.
Small golden-yellow shortly stalked axillary flower-heads nodding in fruit
A weedy, thinly hispid annual herb up to about 2 ft. high
Life form annual
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.3 - 0.61
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

A weed of cultivation, wasteland, pastures and roadsides, usually in damp situations, on a range of soils from sands to clays, from sea level to at least 650 m alt. Sometimes invading woodland, regenerating rainforest and vine forest, particularly in disturbed areas.
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In wet areas mostly near the sea; flowering more frequently during the rains.
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Uses medicinal
Edible -
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

Eleutheranthera ruderalis leaf picture by Dewi Latifa (cc-by-sa)

Flower

Eleutheranthera ruderalis flower picture by pratiwir pratiwir (cc-by-sa)

Distribution

Eleutheranthera ruderalis world distribution map, present in Australia, Brazil, China, and Panama

Identifiers

LSID urn:lsid:ipni.org:names:75097-3
WFO ID wfo-0000076948
COL ID 6F4JK
BDTFX ID -
INPN ID 629614
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Fingalia hexagona Tetranthus ruderalis Spilanthes muticus Verbesina foliacea Eclipta undulata Ogiera ruderalis Eleutheranthera discoidea Pectis ramosissima Kegelia ruderalis Melampodium ruderale Ogiera eleuthranthera Eleutheranthera ovalifolia Gymnopsis microcephala Wedelia eclipta Wedelia discoidea Ogiera leiocarpa Kegelia ramossisima Melampodium ruderalis Eleutheranthera ovata Sigesbeckia portoriccensis Ogiera triplinervis Ogiera triplinervis var. triplinervis Eclipta prostrata var. undulata Ogiera triplinervis var. portoriccensis Eleutheranthera ruderalis var. ruderalis Eleutheranthera prostrata var. portoriccensis Eleutheranthera prostrata var. leiocarpa Ogiera triplinervis var. leiocarpa Wedelia discoidea Eleutheranthera ruderalis

Lower taxons

Eleutheranthera ruderalis var. radiata