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This species is accepted, and its native range is E. Canada to Central & E. U.S.A.
A specimen from Kew's Herbarium

[FTEA]

Lemnaceae, F. N. Hepper. Flora of Tropical East Africa. 1973

Morphology General Habit
Thallus free-floating, pale green, ovate, variable in size, 1.5–4 mm. long, 0.7–2.5 mm. wide, asymmetrical, upper surface with or without an apical papilla and 1 or more along the midline, obscurely 3-nerved.
Growth
Daughter thallus very shortly stipitate, several individuals adhering closely.
Morphology Roots
Root solitary; sheath winged below the thallus; root-cap acute.
Morphology Reproductive morphology Flowers
Flowering cavity lateral; spathe open. Staminate flowers 2; anthers 2-thecous. Pistillate flower 1; style concave.
sex Male
Staminate flowers 2; anthers 2-thecous.
sex Female
Pistillate flower 1; style concave.
Morphology Reproductive morphology Fruits
Fruit ribbed, 1-seeded.
Figures
Fig. 1/4, p. 3.
Habitat
Covering surface of pools in a continuous sheet or fewer individuals in backwaters, rock pools and rice fields; 0–1600 m.
Distribution
K5 K6 K7 T1 T2 T3 T4 T6 T7 U2 U4 widespread in Africa and throughout the tropical and warmer parts of the world

[CATE]

CATE Araceae, 17 Dec 2011. araceae.e-monocot.org

Distribution
Temperate oceanic region of central and Eastern North America
Vernacular
Smallest Duckweed
Diagnostic
Seeds with 35-70 indistinct ribs, stay within the fruit wall after ripening; wing of root sheath 2-3 times as long as wide; very often 2-3 papaules above the node which are bigger than the papule near the tip. Root caps acute; sheath of root at junction with thallus winged; thallus flat, thin.
General Description
Fronds 1-4 mm long, 0.8-3.0 mm wide, 1-1 2/3 times as long as wide; on the upper surface often 2-3 papules above the node which are bigger than the ones near the tip; wing of the root sheath 2-3 times as long as wide. INFLORESCENCE: plants often flowering and fruiting. INFRUCTESCENCE: Fruit 0.7-1.0 mm long, 0.5-0.7 mm wide; laterally with a winged margin; wing about 0.05 mm wide; style 0.2-0.4 mm long; seed 0.6-0.8 mm long, 0.4-0.6 mm thick, whitish, with 35-70 indistinct ribs, stays within the fruit wall-after ripening; outer seed coat with 5-7 subepidermal cell layers.

Native to:

Arkansas, District of Columbia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Québec, Rhode I., Tennessee, Texas, Vermont, Virginia, West Virginia, Wisconsin

Introduced into:

Aruba, Assam, Bangladesh, Burundi, France, Hawaii, India, Iran, Korea, Lesser Sunda Is., Malaya, Netherlands Antilles, Nicobar Is., Sri Lanka, West Himalaya, Yemen

Lemna perpusilla Torr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1975 Powys, P. [89], Kenya K000499402
Hepper, F.N. [4656], Sri Lanka 33554.001
Hepper, F.N. [4612], Sri Lanka 33558.000
Hepper, F.N. [4637], Sri Lanka 33559.000
Hepper, F.N. [4632], Sri Lanka 33560.000
Hepper, F.N. [4654], Sri Lanka 33562.000
Hepper, F.N. [4752], Sri Lanka 33565.000
Hepper, F.N. [4645], Sri Lanka 33570.000
Hepper, F.N. [4748], Sri Lanka 33571.000
Milne-Redhead, E. [7048], Tanzania 33962.000
Richards, H.M. [21,000], Tanzania 34087.000
Tanzania 34350.000
Hepper, F.N. [5515], Tanzania 34364.000
Richards, H.M. [26786], Tanzania 34961.000
Taylor, P. [13082], USA 35367.001
Kokoi, N., New Guinea 36497.000
Kenya 42061.001

First published in Fl. New York 1: 245 (1843)

Accepted by

  • Chang, C.S., Kim, H. & Chang, K.S. (2014). Provisional checklist of vascular plants for the Korea peninsula flora (KPF): 1-660. DESIGNPOST.
  • Dinarvand, M. (2010). Two new records of the genera Najas (Najadaceae) and Lemna (Lemnaceae) for aquatic flora of Iran Iranian Journal of Botany 16: 233-236.
  • Girmansyah, D. & al. (eds.) (2013). Flora of Bali an annotated checklist: 1-158. Herbarium Bogorensis, Indonesia.
  • Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Mostaph, M.K. & Uddin, S.B. (2013). Dictionary of plant names of Bangladesh, Vasc. Pl.: 1-434. Janokalyan Prokashani, Chittagong, Bangladesh.
  • National Parks Board Singapore (2006). Vascular Plant Life Checklist Pulau Ubin www.nparks.gov.sg/nparks_cms/cms/cmsmgr/data/6/PlantChkList.xls.
  • Sarmah, K.K. & Borthakur, S.K. (2009). A checklist of angiospermic plants of Manas national park in Assam, India Pleione 3: 190-200.

Literature

CATE Araceae

  • Landolt, E. 1986. The family of Lemnaceae - a monographic study, 1. Veröff. Geobot. Isnt. ETH (Stift. Rübel). 71: 1-563

Kew Backbone Distributions

  • Chang, C.S., Kim, H. & Chang, K.S. (2014). Provisional checklist of vascular plants for the Korea peninsula flora (KPF): 1-660. DESIGNPOST.
  • Dinarvand, M. (2010). Two new records of the genera Najas (Najadaceae) and Lemna (Lemnaceae) for aquatic flora of Iran Iranian Journal of Botany 16: 233-236.
  • Girmansyah, D. & al. (eds.) (2013). Flora of Bali an annotated checklist: 1-158. Herbarium Bogorensis, Indonesia.
  • Mostaph, M.K. & Uddin, S.B. (2013). Dictionary of plant names of Bangladesh, Vasc. Pl.: 1-434. Janokalyan Prokashani, Chittagong, Bangladesh.
  • National Parks Board Singapore (2006). Vascular Plant Life Checklist Pulau Ubin www.nparks.gov.sg/nparks_cms/cms/cmsmgr/data/6/PlantChkList.xls.
  • Pandey, R.P. & Dilwakar, P.G. (2008). An integrated check-list flora of Andaman and Nicobar islands, India Journal of Economic and Taxonomic Botany 32: 403-500.
  • Sarmah, K.K. & Borthakur, S.K. (2009). A checklist of angiospermic plants of Manas national park in Assam, India Pleione 3: 190-200.
  • Wagner, W.L., Herbst, D.R. & Sohmer, S.H. (1999). Manual of the Flowering Plants of Hawai'i, rev. ed., 2: 989-1918. University of Hawai'i Press, Bishop Museum Press.

Flora of Tropical East Africa

  • Daubs, Monogr. Lemnac.: 25, t. 9 (1965).
  • F. W. Andr., The Flowering Plants of the Sudan 3: 284 (1956).
  • Hegelm., Lemnac. Monogr.: 139, t. 6/19, 20, t. 7/18, 19 (1868).
  • Torrey, Fl. New York 2: 245 (1843).

CATE Araceae
Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 17 Dec 2011.
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0