1. Family: Poaceae Barnhart
    1. Genus: Poa L.
      1. Poa annua L.

        This species is accepted, and its native range is Temp. Old World to Tropical Mountains.

    [FTEA]

    Gramineae, W. D. Clayton, S. M. Phillips & S. A. Renvoize. Flora of Tropical East Africa. 1974

    Habit
    Loosely to compactly tufted annual or short-lived perennial; culms 2.5–30 cm. high, erect, spreading or prostrate.
    Leaves
    Leaf-blades 1–14 cm. long and 1–5 mm. wide, weak, often crinkled when young, blunt at the tip; ligule 2–5 mm. long.
    Inflorescences
    Panicle ovate or triangular, 1–12 cm. long, open and loose or somewhat dense.
    Spikelets
    Spikelets 3–10-flowered, ovate or oblong, 3–10 mm. long; lower glume lanceolate to ovate, 1.5–3 mm. long, 1-nerved; upper glume elliptic or oblong, 2–4 mm. long, 3-nerved, broadest at about the middle; lemmas broadly elliptic with prominent white hyaline margins, 2.5–4 mm. long, obtuse to emarginate (obtuse in side view), glabrous or hairy on the nerves; palea-keels glabrous or ciliate; anthers 0.7–1.2(–1.6) mm. long.
    Habitat
    A ruderal species of pathsides and disturbed ground in upland districts; 2000–3550 m.
    Distribution
    K3 K4 T2 T3 T7 U2 cosmopolitan, doubtless introduced to East Africa
    [FWTA]

    Gramineae, W. D. Clayton. Flora of West Tropical Africa 3:2. 1972

    Habit
    Loosely tufted annual up to about 15 cm. high.
    [GB]
    Habit
    Annual; caespitose. Butt sheaths herbaceous. Culms erect, or geniculately ascending, or decumbent; 3-30 cm long; 2-4 -noded. Culm-internodes terete; smooth. Lateral branches lacking, or sparse. Leaves mostly basal. Leaf-sheaths keeled; smooth. Ligule an eciliate membrane; 2-5 mm long; obtuse. Leaf-blades flat, or conduplicate; 1-14 cm long; 1-5 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade margins scaberulous. Leaf-blade apex obtuse, or abruptly acute; hooded.
    Inflorescences
    Inflorescence a panicle. Panicle open; pyramidal, or ovate; 1-12 cm long. Primary panicle branches spreading; 1-2 -nate. Panicle branches smooth. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.3-4 mm long.
    Spikelets
    Spikelets comprising 3-10 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; 3-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas; smooth. Floret callus glabrous, or pubescent.
    Fertile
    Spikelets comprising 3-10 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; 3-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes obscured by lemmas; smooth. Floret callus glabrous, or pubescent.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate, or ovate; 1.5-3 mm long; 0.7-0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume elliptic, or oblong; 2-4 mm long; 0.9-1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
    Florets
    Fertile lemma ovate; oblong in profile; 2.5-4 mm long; membranous; much thinner above; much thinner on margins; keeled; 5 -veined. Lemma lateral veins stopping well short of apex. Lemma surface glabrous, or pubescent; hairy below; hairy on veins. Lemma apex acute. Palea 0.9 length of lemma. Palea keels eciliate, or ciliolate. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3; 0.7-1.3 mm long.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform.
    Distribution
    Europe: northern, central, southwestern, southeastern, and eastern. Africa: north, Macaronesia, west-central tropical, northeast tropical, east tropical, southern tropical, south, middle Atlantic ocean, and western Indian ocean. Asia-temperate: Siberia, Soviet far east, Soviet Middle Asia, Caucasus, western Asia, Arabia, China, Mongolia, and eastern Asia. Asia-tropical: India, Indo-China, Malesia, and Papuasia. Australasia: Australia and New Zealand. Pacific: southwestern, south-central, and north-central. North America: Subarctic, western Canada, eastern Canada, northwest USA, north-central USA, northeast USA, southwest USA, south-central USA, southeast USA, and Mexico. South America: Mesoamericana, Caribbean, northern South America, western South America, Brazil, and southern South America. Antarctic: Subantarctic islands.
    Reference
    Poeae. CEH.
    [FZ]

    Gramineae, E. Launert. Flora Zambesiaca 10:1. 1971

    Habit
    A caespitose delicate annual (very rarely perennial).
    Culms
    Culms 2·5-30 cm. tall, 2-4-noded, erect, spreading or decumbent, sometimes rooting at the lower nodes, rather slender, terete, glabrous, smooth.
    Leaf sheaths
    Leaf-sheaths usually loose, somewhat compressed, keeled, smooth, usually glabrous.
    Ligules
    Ligule 2-5 mm. long.
    Leaf lamina
    Leaf-laminae 1·5-10(15) x 0·1-0·5 cm., linear or linear-oblong, with the apex abruptly acute or often cucullate, expanded or folded, flaccid, scaberulous along the margins otherwise smooth, glabrous.
    Inflorescences
    Panicle 2-8(12) cm. long, open or more rarely contracted, ovate in outline, somewhat stiff; branches usually 2 (rarely 3-5)-nate or solitary, spreading at first, later usually slightly deflexed, smooth; pedicels 0·3-5 mm. long, smooth.
    Spikelets
    Spikelets 3-8(10) mm. long, 3-7(10)-flowered, ovate to oblong in outline, usually crowded, green or often tinged with purple.
    Glume
    Inferior glume 1·5-3 mm. long, 1-nerved, ovate or lanceolate; the superior 2-4·25 mm. long, 3-nerved, elliptic or oblong.
    Lemma
    Lemmas 2·3-4·25 mm. long, broadly elliptic or ovate-elliptic with white hyaline margins, with the apex obtuse.
    Anthers
    Anthers 0·7-1·2(1·6) mm. long.
    Fruits
    Caryopsis 1-2 mm. long.
    [GB]
    Habit
    Perennial; culms solitary. Culms 18-23 cm long; 1 -noded. Leaf-sheaths glabrous on surface, or puberulous. Ligule an eciliate membrane; 0.5-1 mm long; erose. Leaf-blades straight; involute; 3-6 cm long; 2 mm wide; 2 cm long at summit of culm. Leaf-blade surface smooth, or scaberulous; rough adaxially. Leaf-blade apex obtuse, or abruptly acute.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; lanceolate; 4.5-6 cm long. Primary panicle branches ascending. Panicle branches capillary. Spikelets solitary. Fertile spikelets pedicelled. Pedicels terete; smooth.
    Spikelets
    Spikelets comprising 4-5 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 9-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth.
    Fertile
    Spikelets comprising 4-5 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 9-10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.3-2.5 mm long; 0.75 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex obtuse, or acute. Upper glume lanceolate; 3.3-3.5 mm long; 0.66 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume apex obtuse, or acute.
    Florets
    Fertile lemma oblong; 5.5-6 mm long; chartaceous; without keel; 5 -veined. Lemma lateral veins prominent. Lemma surface smooth, or scaberulous; rough above. Lemma apex acute; awned; 1 -awned. Principal lemma awn 0.5-1.5 mm long overall. Palea 2 -veined. Palea keels smooth, or scaberulous. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Anthers 3; 0.6-0.8 mm long.
    Fruits
    Caryopsis with adherent pericarp. Hilum linear.
    Distribution
    South America: western South America.
    Reference
    Poeae. Tovar 1995.

    Distribution

    Native to:

    Afghanistan, Albania, Algeria, Altay, Amur, Assam, Austria, Azores, Baleares, Baltic States, Belarus, Belgium, Bulgaria, Burundi, Cameroon, Canary Is., Central European Rus, China North-Central, China South-Central, China Southeast, Corse, Cyprus, Czechoslovakia, Denmark, East Aegean Is., East European Russia, East Himalaya, Egypt, Eritrea, Ethiopia, Finland, France, Føroyar, Germany, Great Britain, Greece, Gulf of Guinea Is., Gulf States, Hainan, Hungary, Iceland, India, Inner Mongolia, Iran, Iraq, Ireland, Irkutsk, Italy, Japan, Kamchatka, Kazakhstan, Kenya, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Kriti, Krym, Kuril Is., Kuwait, Lebanon-Syria, Libya, Madagascar, Madeira, Magadan, Manchuria, Mongolia, Morocco, Myanmar, Nansei-shoto, Nepal, Netherlands, North Caucasus, North European Russi, Northwest European R, Norway, Pakistan, Palestine, Poland, Portugal, Primorye, Qinghai, Rodrigues, Romania, Rwanda, Réunion, Sakhalin, Sardegna, Saudi Arabia, Sicilia, Sinai, South European Russi, Spain, Sri Lanka, Sweden, Switzerland, Tadzhikistan, Taiwan, Tanzania, Tibet, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Tuva, Uganda, Ukraine, Uzbekistan, Vietnam, West Himalaya, West Siberia, Xinjiang, Yemen, Yugoslavia

    Introduced into:

    Alabama, Alaska, Alberta, Aleutian Is., Amsterdam-St.Paul Is, Antarctica, Antipodean Is., Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Ascension, Bangladesh, Bermuda, Bolivia, Brazil South, Brazil Southeast, British Columbia, California, Cape Provinces, Chatham Is., Chile Central, Chile North, Chile South, Colombia, Colorado, Connecticut, Costa Rica, Crozet Is., Cuba, Delaware, Desventurados Is., District of Columbia, Dominican Republic, Easter Is., Ecuador, El Salvador, Falkland Is., Florida, Free State, Galápagos, Georgia, Greenland, Guatemala, Haiti, Hawaii, Heard-McDonald Is., Honduras, Idaho, Illinois, Indiana, Iowa, Jamaica, Jawa, Juan Fernández Is., Kansas, Kentucky, Kerguelen, Kermadec Is., KwaZulu-Natal, Labrador, Leeward Is., Lesotho, Lesser Sunda Is., Louisiana, Macquarie Is., Maine, Malaya, Manitoba, Marion-Prince Edward, Masachusettes, Mexican Pacific Is., Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Montana, Namibia, Nebraska, Nevada, New Brunswick, New Caledonia, New Guinea, New Hampshire, New Jersey, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Newfoundland, Nicaragua, Norfolk Is., North Carolina, North Dakota, Northern Provinces, Northern Territory, Northwest Territorie, Nova Scotia, Ogasawara-shoto, Ohio, Oklahoma, Ontario, Oregon, Panamá, Paraguay, Pennsylvania, Peru, Philippines, Prince Edward I., Puerto Rico, Queensland, Québec, Rhode I., Saskatchewan, South Australia, South Carolina, South Dakota, South Georgia, St.Helena, Sumatera, Swaziland, Tasmania, Tennessee, Texas, Tristan da Cunha, Uruguay, Utah, Venezuela, Vermont, Victoria, Virginia, Washington, West Virginia, Western Australia, Wisconsin, Wyoming, Yukon, Zambia, Zimbabwe

    Poa annua L. appears in other Kew resources:

    Date Identified Reference Herbarium Specimen Type Status
    Mar 1, 2005 Tchiengue, B. [1966], Cameroon K000437365
    Jan 1, 1982 Smeds, H. [1152], Ethiopia K000345211
    France K000641166
    Hinton, G.B. [2101], México State K000465691
    Hinton, G.B. [5348], México State K000465692
    Hinton, G.B. [1527], México State K000465693
    Maitland, T.D. [1216], Cameroon K000181869
    Maitland, T.D. [854], Cameroon K000181872
    Ball, J. [s.n.], Brazil K001077937
    Clayton, W.D. [4340], Brazil K001077918
    Clayton, W.D. [4658], Brazil K001077928
    Hooker, J.D. [s.n.] K001077930
    Strachey, R. [13], Uttaranchal K000789541
    Strachey, R. [13], Uttaranchal K000789542 lectotype
    Brenan, J.P.M. [9583], Cameroon K000181873
    s.coll. [s.n.], France K000641165
    Pennsylvania K000633947 Unknown type material
    Longhi-Wagner, H.M. [2857], Brazil K001077939
    Longhi-Wagner, H.M. [2869], Brazil K001077922
    Preston, T.A. [a.n.], Brazil K001077927
    Lanna, J.P. [43], Brazil K001077925
    Riedel [s.n.], Brazil K001077934
    Wight, R. [1789], India K001077929
    Schimper, W. [968], Saudi Arabia K000641309
    Gehrt, A. [s.n.], Brazil K001077924
    Bouton, L. [s.n.], Mauritius K001077931
    [illegible] [s.n.], France K000641164
    Lejeune [s.n.], France K000641161
    Lejeune [s.n.], France K000641162
    Lejeune [s.n.], France K000641163
    Lejeune [s.n.], France K000641167
    Sellow [s.n.], Brazil K001077926
    Cordeiro, J. [2135], Brazil K001077917
    Cope, T.A. [RBG 4], United Kingdom K000914511
    Cope, T.A. [RBG 324], United Kingdom K000914512
    Cope, T.A. [RBG 375], United Kingdom K000914525
    Strang, H.E. [s.n.], Brazil K001077921
    Koczicki, C. [220], Brazil K001077919
    Dombrowski, L.T. [2056], Brazil K001077923
    Hinton, J.C. [17253], Nuevo León K000465694
    Glaziou, A.F.M. [16556] K001077938
    Glaziou, A. [6970], Brazil K001077933
    Glaziou, A. [1638], Brazil K001077935
    Glaziou, A. [16556], Brazil K001077936
    Skvortzov, B. [48], Brazil K001077916
    Hinds, J. H. [57], Cameroon K000181868
    Hinds, J. H. [5], Cameroon K000181871
    s.coll. [s.n.], Uruguay K001077932
    Sarahyba, L.S.P. [s.n.], Brazil K001077915
    Baglioli, V. [4], Brazil K001077920

    First published in Sp. Pl.: 68 (1753)

    Accepted by

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    Flora Zambesiaca
    Flora Zambesiaca
    [A] http://creativecommons.org/licenses/by-nc-sa/3.0

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

    Flora of West Tropical Africa
    Flora of West Tropical Africa
    [C] http://creativecommons.org/licenses/by-nc-sa/3.0

    GrassBase - The Online World Grass Flora
    [D] http://creativecommons.org/licenses/by-nc-sa/3.0

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    [E] © 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 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    [F] © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0