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Mimosa pigra

(Amourette)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in Afrikaans:

Raak-My-Nie

Common Names in English:

Amourette, Aguiste, Ara, Bambuco, Bashful Plant, Bashfulplant, Black Mimosa, Carb, Carpinchera, Catclaw Mimosa, Cutclaw, Dormilona, Dormilona Grande, Espina De Vaca, Giant Mimosa, Giant Sensitive Plant, Giant Sensitive Tree, Giant Sensitive-Plant, Giant Sensitive-Tree, Giant Trembling Plant, Jiquiri Grande, Mimosa, Pingahuisacha, Thorny Sensitive Plant, Thorny Sensitive-Plant, Thorny Sensitiveplant Mimosa Pigra, Trinh Nu Nhon, Trupilla, Una-De-Gat, Xao Ho, Zamourette, Zarza

Common Names in German:

Mimose

Common Names in Indonesian:

Putri Malu

Common Names in Malagasy:

Roitia, Roui, Rouitibe, Roy

Common Names in Malay:

Kembang Gajah, Semalu Gajah

Common Names in Portuguese:

Columbi-Da-Lagoa, Juquiri, Juquiri Grand, Juquiri-Grande, Malicia-De-Boi, Unha-De-Gato

Common Names in Spanish:

Eomrmidera, Espino, Sensitiva, Una De Gato

Common Names in Thai:

Chi Yop, Mai Yah Raap Yak, Maiyarap Ton

Description

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Subfamily Mimosoideae

Mostly trees or shrubs . Leaves mostly bipinnate. Corolla usually not showy, actinomorphic , sympetalous , the lobes valvate . Stamens 10-numerous, often monadelphous , showy. Pollen released in monads , tetrads , or polyads . Seeds with u-shaped line (pleurogram) present. [Carr]

Genus Mimosa

Trees shrubs or herbs, mostly armed ; leaves bipinnate; secondary rachides mostly 2-stipellate. Inflorescence globose head or cylindric spike. Flowers small, sessile 6-3-merous. Calyx usually minute. Petals more or less connate . Stamens double the number of petals or equal, free , often twice as long as the corol¬la; anthers small, eglandular . Ovary usually sessile, 2 or more ovuled; style fill form. Fruit oblong or linear , usually plano-compressed, valves 2, separating from the persistent margins . Seeds ovate or orbicular , flat.

A genus with about 600 species, mostly from tropics and subtropics.[1]

Physical Description

Species Mimosa pigra

A woody, much-branched shrub growing to about 6 m tall in moist sites in the tropics or sub-tropics. Leaves are bipinnate, with 6-16 pairs of pinnae, and sensitive to touch. Stems are armed with broad-based prickles up to 7 mm long. Leaves are also armed with erect , slender prickles and stouter pairs of horizontal prickles. Flowers in globose heads about 1 cm in diameter and pink or mauve . Clusters of densely hairy pods turning brown when ripe , breaking into about 20 partially dehiscent segments each containing a seed, the pod sutures remaining as an empty frame.

Habit: ShrubClimbing: Not Climbing

Size/Age/Growth

Size: 8-10' tall.

Habitat

Mimosa favors a wet-dry tropical climate and would probably not be a major problem in regions with an annual rainfall of less than 750 mm or greater than 2250 mm, except in cases of clear cutting. Mimosa does not appear to grow preferentially in any soil type, but is found most commonly in floodplains and riverbanks within soils ranging from black cracking clays to sandy clays to coarse siliceous river sand. Seed production and plant life expectancy are greater on black cracking clays than on the lighter clays and silty loams (Lonsdale 1992).

Typically found at an altitude of 0 to 3,037 meters (0 to 9,964 feet).[2]

Ecology: It spreads out from watercourses , destroying natural ecosystems and smothering pastures. In Northern Australia about 450 km squared of river floodplain and swamp forest has been covered by dense, monospecific thickets of Mimosa pigra. These thickets have fewer birds and lizards, less herbaceous vegetation and fewer tree seedlings than uninvaded native vegetation. It prevents traditional food gathering by Aborigines on otherwise resource rich wetlands. It threatens pastoral industries and prevents access to waterways by people and animals. In Asia it blocks irrigation channels and causes silting of dams. It is a safety hazard along roadways.

Biology

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Reproduction

Bee-pollinated, probably self-compatible, possibly wind-pollinated as well. Does not normally reproduce vegetatively.A typical annual production of about 9,000 seeds per square metre . Annual seed production per plant has been measured at up to 220,000 seeds under ideal conditions. The seeds are extremely hard and can remain dormant for more than 15 years.

Plants can begin flowering 6-8 months after germination. Flowering continues as long as water is available. Flower buds take 7-9 days to mature , and production of mature seed pods a further 25 days.

Duration: Perennial

Growth

Sunlight: Sun Exposure: Full Sun .

Temperature: Cold Hardiness: 9a, 9b, 10a, 10b, 11. (map)

Taxonomy

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Synonyms

Mimosa asperata pigra Willd. • Mimosa asperata var. pigra Willd. • Mimosa brasiliensis Niederl. • Mimosa canescens Willd. • Mimosa ciliata Willd. • Mimosa hispida Willd. • Mimosa polyacantha Willd. • Mimosa polycantha Willd.

Notes

Name Status: Accepted Name .

Comment: Climbing : Not climbing, Conservation Status: Not Threatened, Habit: Shrub , Lifespan: Perennial

Similar Species

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Members of the genus Mimosa

ZipcodeZoo has pages for 41 species, subspecies, varieties, forms, and cultivars in this genus:

M. aculeaticarpa (Cat's-Claw Mimosa) · M. albida (Zarza) · M. arenosa (Elegant Mimosa) · M. asperata (Black Mimosa) · M. bahamensis (Bahama Mimosa) · M. borealis (Catclaw Mimosa) · M. caesalpiniifolia (Jupinuan) · M. casta (Graceful Mimosa) · M. ceratonia (Black Ambret) · M. diplotricha (Giant False Sensitive Plant) · M. diplotricha var. inermis (Giant Sensitive-Plant) · M. dysocarpa (Velvetpod Mimosa) · M. emoryana (Emory's Mimosa) · M. grahamii (Graham's Mimosa) · M. hystricina (Porcupine Mimosa) · M. invisa (Giant False Sensitive Plant) · M. latidens (Kairn's Sensitive-Briar) · M. laxiflora (Arizona Mimosa) · M. macracantha (Long-Spined Acacia) · M. malacophylla (Soft-Leaf Mimosa) · M. nuttallii (Catclaw Sensitivebriar) · M. pellita (Lollipop Mimosa) · M. pigra (Amourette) · M. pigra var. pigra (Thorny Sensitive-Plant) · M. pudica (Cierra Tus Puertas) · M. pudica var. hispida (Sensitive Plant) · M. pudica var. pudica (Shameplant) · M. pudica var. setosa (Sensitive-Plant) · M. pudica var. tetrandra (Sensitive-Plant) · M. pudica var. unijuga (Shameplant) · M. quadrivalvis (Cats Claw) · M. quadrivalvis var. floridana (Catclaw Sensitivebriar) · M. quadrivalvis var. hystricina (Bristly Sensitive-Brier) · M. rupertiana (Eastern Sensitive Plant) · M. scabrella (Abaracaatinga) · M. schomburgkii (Schomburgk's Mimosa) · M. somnians (Dormideira) · M. strigillosa (Herbaceous Mimosa) · M. tenuiflora (Cabrera) · M. turneri (Desert Mimosa) · M. verrucosa (Jurema Branca)

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 22, 2007:

Identifiers

Footnotes

  1. "Mimosa". in Flora of Pakistan . Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. Mean = 341.390 meters (1,120.046 feet), Standard Deviation = 583.570 based on 692 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/14/2012