Code
LGGPT
Growth form
broadleaf
Biological cycle
annual
Habitat
terrestrial
synonym | Blumea alata var. montana C.D.Adams |
synonym | Blumea crispata (Vahl) Merxm. |
synonym | Blumea crispata var. montana (C.D.Adams) J.-P.Lebrun & Stork |
synonym | Blumea pterodonta DC. |
synonym | Blumea purpurascens A.Rich. |
synonym | Blumea tetraptera (Turcz.) Rolfe |
synonym | Blumea vernonioides DC. |
synonym | Conyza crispata Vahl |
synonym | Conyza ctenoptera Kunth |
synonym | Conyza odontoptera Webb |
synonym | Conyza tetraptera Turcz. |
synonym | Laggera alata var. montana C.D.Adams |
synonym | Laggera intermedia C.B.Clarke |
synonym | Laggera pterodonta (DC.) Sch.Bip. ex Oliv. |
synonym | Laggera pterodonta (DC.) Sch.Bip. ex Schweinf. |
synonym | Laggera purpurascens Sch.Bip. ex Hochst. |
synonym | Serratula polygyna A.Rich. |
Chinese |
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French |
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Global description
Laggera crispata is a rapidly developing plant, erect, which measures up to 1.5 m high. The stem exudes a yellow latex when cut. The leaves are sessile and decurrent forming leafy wings serrated along the stem. The leaf blade is elliptic to oblong-lanceolate, homogeneous light green color. The upper branches of the inflorescence often wingless, densely glandular puberulous. The entire plant is dotted with short, yellow, glandular hairs. The flowers are arranged in stalked capitulum of 10 to 15 mm in diameter, more or less tilted and arranged in leafy panicles more or less wide. The flower heads are surrounded by 4 or 5 rows of involucral bracts.
Cotyledons
The cotyledons are obovate and sessile. They are 7 mm long and 4 mm wide.
First leaves
The first leaves are alternate. They are simple and sessile. The obovate lamina has an attenuated petiolated base.
General habit
The plant is erect. It has a strong development and is heavily branched. It measures 0.5 to 1.5 m high.
Underground system
The plant has a taproot system
Stem
The stem is cylindrical and solid. It is covered with small yellow glandular hairs. It is bordered by continuous foliated and highly serrated wings. A yellow latex flows when cutting the stem.
Leaf
The leaves are alternate and sessile. The base of the blade is decurrent and extends along the stem in leafy, highly serrated wings. The lamina is oblong-eliptical to lanceolate. It measures up to 21 cm long and 5,5 cm wide. The apex is wedged, apiculate and margin is serrated. Upper face is pubescent and lower face is more or less glabrous. Both faces are light green and covered with short yellow glandular hairs.
Inflorescence
The florets are assembled in stalked capitulum of 10 to 15 mm in diameter. Stalk is 1 to 3 cm long, with bracts, glandular. Capitulum are more or less tilted. The whole forms a large leafy inflorescence in panicle.
Flower
The capitulum measure 10 to 15 mm in diameter. The capitulum are surrounded by an involucre of 4 or 5 rows of bracts, elliptical to lanceolate, rigid, glandular. The outer bracts are recurved, 4,5 mm long. The inner bracts are longer, up to 12 mm long, linear in shape and do not have glands. All florets of the capitulum are tubulate. Outer florets are female, with threadlike corolla, 7 mm long and pink to purple in color. Inner florets are bisexual corolla of 5 to 7 mm long, with 5 lobes ovate.
Fruit
The fruits are very short achenes, 1,5 mm long, cylindrical, pubescent. The top is surmounted by a pappus comprising of many bristles, 7 mm long on a sigle raw. The bristles are finely scabrous.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Northern Cameroon: Laggera crispata is a species of end of the cultural cycle. Germination begins in the middle of the rainy season (August), followed by a long period of vegetation. Flowering occurs from October, when the rains are spaced, and lasts until December. Seed dispersal occurs at the beginning of the dry season (December to February), until the plant dries out.
China: Laggera crispata flowers and fruits from January to July.
Madagascar: Laggera crispata is flowering by the end of the cropping season, during the dry season from June, mainly between June and September.
Mayotte: Laggera crispata flowers from January to December and fruits from February to December.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Both species are erect annual or biennial herbs, becoming woody at the base, with simple leaves, alternate, sessile, oblong, decurrent in large uninterrupted wings, more or less toothed margins. The following main characters distinguish them quite easily.
young plant | adult | Inflorescence | Distribution and harmfullness in Madagascar | |
Laggera crispata |
- entirely pubescent green; - oblong-elliptic leaf with apex subacute and attenuate base, light green uniform |
- stout plant with strong development, reaching more than 1 m high; - abundantly branched, leaves oblong - elliptic to lanceolate; - Finely toothed wings; - light green homogeneous. |
- flowers gathered in capitulum stalked +- tilted 10 to 15 mm in diameter and arranged in leafy panicles +- wide. - Flower heads surrounded by 4 or 5 rows of bracts. |
- generally scarce in annual crops. - Recorded especially on the Highlands and the Middle West above 800 m |
Neojeffreya decurrens |
- pubescent – grayish; - leaves oblong-subspatulate often marked by the presence of a gray-brown spots at the base of the blade and wings. |
- medium size plant, from 30 cm to 1 m high, - +- branched, - leaves oblong - spatulate; - Slightly ondulate wings; - Especially hairy-gray on the underside. |
- flowers gathered in very small elementary capitulum arranged in glomeruls (2nd order capitulum) dense subglobose 8 to 10 mm in diameter, sessile, arranged along the branches in leafy spikes +- loose. |
- localy abundant in crops and new fallows. - present everywhere in more or less all climatic zones of Madagascar. |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Northern Cameroon: Laggera crispata grows in the Sudanese climate region with an annual rainfall of more than 1,300 mm and a dry season duration of less than 5 months. It has no notable soil preference. It develops in ruderal species on the roadsides and in villages and in weeds in annual crops. Its abundance increases with the age of the plot. It is a nitrophilous species which is favored by the strong fertilizer inputs used in the intensive cultivation systems of these regions.
China: Laggera crispata grows on dry hillsides, old clearings, high-altitude rice fields and wasteland; below 2000 m altitude.
Madagascar: Laggera crispata grows in ferralitic soils with medium or low fertility, in sunny places. It is a ruderal plant and a weed of crops in cropping systems based on cassava or fruit crops more or less extensive, on slopes and on the edge of cultures and water channels from 800 to 1600 m above sea level in the regions of the Central Highlands, Middle west, Middle east.
Mayotte: L. crispata is uncommon in open and secondarized environments. It is found on padza, in xerophilous lawns and thickets, in crops and in urban areas.
Reunion: Species mentioned in humid areas of altitude, Cilaos, Plaine d’Affouches, Saint-Denis.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Local harmfulness
Madagascar: Laggera crispata is a weed with low frequency and low abundant in crops. It does not present any particular difficulty to control. This is weed that likes edges of fields and water channels on the highlands above 800 m. In rare cases L. crispata may be abundant in the more or less extensive crops on slops (fruit crops, cassava).
Reunion: Species growing in mesothermic environments but not observed in agricultural plots.
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Attributions | |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Herbarium pictures ReCOLNAT for Laggera crispata: https://explore.recolnat.org/search/botanique/simplequery=Laggera%2520crispata
Herbarium pictures ReCOLNAT for Laggera pterodonta: https://explore.recolnat.org/search/botanique/simplequery=Laggera%2520pterodonta
Attributions | Wiktrop |
Contributors | |
Status | UNDER_CREATION |
Licenses | CC_BY |
References |
Root | Root |
Kingdom | Plantae |
Phylum | Tracheophyta |
Class | Magnoliopsida |
Order | Asterales |
Family | Asteraceae |
Genus | Laggera |
Species | Laggera crispata (Vahl) Hepper & J.R.I.Wood |