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Mimosa is a genus of about 400 species of herbs and shrubs, in the mimosoid clade of the legume family Fabaceae. The generic name is derived from the Greek word μιμος (mimos), an "actor" or "mime," and the feminine suffix –osa, "resembling", suggesting its 'sensitive leaves' which seem to 'mimic conscious life'.[2][3]

Mimosa
Mimosa-pudica-flower.jpg
Mimosa pudica flower heads
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae[1]
(unranked): Mimosoid clade[1]
Genus: Mimosa
L.
Species

About 400 species, see text

Synonyms
  • Acanthopteron Britton
  • Haitimimosa Britton
  • Leptoglottis Britton & Rose 1928
  • Leptoglottis DC.
  • Leptoglottis DC. ex Standl.
  • Lomoplis Raf.
  • Mimosopsis Britton & Rose
  • Morongia Britton 1894
  • Neomimosa Britton & Rose
  • Pteromimosa Britton
  • Schranckiastrum Hassl. 1919
  • Schrankia Willd. 1806

Two species in the genus are especially notable. One is Mimosa pudica, because of the way it folds its leaves when touched or exposed to heat. It is native to southern Central and South America but is widely cultivated elsewhere for its curiosity value, both as a houseplant in temperate areas, and outdoors in the tropics. Outdoor cultivation has led to weedy invasion in some areas, notably Hawaii. The other is Mimosa tenuiflora, which is best known for its use in shamanic ayahuasca brews due to the psychedelic drug dimethyltryptamine found in its root bark.

Contents

TaxonomyEdit

The taxonomy of the genus Mimosa has had a tortuous history, having gone through periods of splitting and lumping, ultimately accumulating over 3,000 names, many of which have either been synonymized under other species or transferred to other genera. In part due to these changing circumscriptions, the name "Mimosa" has also been applied to several other related species with similar pinnate or bipinnate leaves, but are now classified in other genera. The most common examples of this are Albizia julibrissin (silk tree) and Acacia dealbata (wattle).

DescriptionEdit

Mimosa pudica leaves closing when touched

Members of this genus are among the few plants capable of rapid movement; examples outside of Mimosa include the telegraph plant, Aldrovanda, some species of Drosera and the famous venus flytrap. The leaves of the Mimosa pudica close quickly when touched. Some mimosas raise their leaves in the day and lower them at night, and experiments done by Jacques d'Ortous de Mairan on mimosas in 1729 provided the first evidence of biological clocks.[4]

Mimosa can be distinguished from the large related genera, Acacia and Albizia, since its flowers have 10 or fewer stamens. Note that, botanically, what appears to be a single globular flower is actually a cluster of many individual ones. Mimosa contains some level of heptanoic acid.

SpeciesEdit

There are about 400 species including:

ReferencesEdit

  1. ^ a b The Legume Phylogeny Working Group (LPWG). (2017). "A new subfamily classification of the Leguminosae based on a taxonomically comprehensive phylogeny". Taxon. 66 (1): 44–77. doi:10.12705/661.3. 
  2. ^ Gledhill, D. (2008). The Names of Plants (4 ed.). Cambridge University Press. p. 356. ISBN 978-0-521-86645-3. 
  3. ^ Austin, Daniel F. (2004). Florida ethnobotany Fairchild Tropical Garden, Coral Gables, Florida, Arizona-Sonora Desert Museum, Tucson, Arizona: with more than 500 species illustrated by Penelope N. Honychurch ... [et al.] Boca Raton, FL: CRC Press. p. 58. ISBN 9780203491881. 
  4. ^ Neuroscience; Bear, Connors, Paradiso
  • Barneby, R.C. 1992. Sensitivae Censitae: A description of the genus Mimosa Linnaeus (Mimosaceae) in the New World. Memoirs of the New York Botanical Garden, vol. 65.

See alsoEdit

Albizia julibrissin, Persian silk tree, called Mimosa in the United States

External linksEdit