1. Family: Poaceae Barnhart
    1. Trisetum Pers.

      1. This genus is accepted, and its native range is Temp. & Subtropical to Tropical Mountains.

    [GB]

    nonem

    Habit
    Perennial. Rhizomes absent (71), or short (9), or elongated (9). Stolons absent (81), or present (6). Culms erect (35/43), or geniculately ascending (19/43), or rambling (1/43); robust (3/12), or slender (8/12), or weak (1/12); 2-49.29-300 cm long; without nodal roots (1/1), or rooting from lower nodes (1/1). Culm-nodes constricted (3/3). Lateral branches lacking (7/8), or sparse (2/8), or ample (1/8). Ligule an eciliate membrane (73), or a ciliolate membrane (15). Leaf-blades filiform (5), or linear (82); herbaceous (85), or coriaceous (2); stiff (12), or firm (73), or flaccid (2). Leaf-blade midrib conspicuous (1/1). Leaf-blade margins unthickened (2/3), or cartilaginous (1/3). Leaf-blade apex muticous (86), or pungent (1).
    Inflorescences
    Inflorescence a panicle; exserted, or embraced at base by subtending leaf (1). Panicle open (44/86), or contracted (27/86), or spiciform (21/86). Primary panicle branches not whorled (79), or whorled at most nodes (8). Spikelets appressed (2/2); solitary. Fertile spikelets pedicelled. Pedicels filiform (1/2), or oblong (1/2).
    Spikelets
    Spikelets comprising 1 fertile florets (7), or 2 fertile florets (76), or 3 fertile florets (63), or 4 fertile florets (10), or 5 fertile florets (4), or 6 fertile florets (2); with a barren rhachilla extension (81), or with diminished florets at the apex (8). Spikelets lanceolate (1), or oblong (83), or cuneate (8); laterally compressed; 3-6.375-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (11/86), or sparsely hairy (4/86), or pubescent (25/86), or pilose (47/86), or villous (2/86). Floret callus glabrous (2/73), or pubescent (61/73), or pilose (7/73), or bearded (3/73); truncate (1), or obtuse (86).
    Fertile
    Spikelets comprising 1 fertile florets (7), or 2 fertile florets (76), or 3 fertile florets (63), or 4 fertile florets (10), or 5 fertile florets (4), or 6 fertile florets (2); with a barren rhachilla extension (81), or with diminished florets at the apex (8). Spikelets lanceolate (1), or oblong (83), or cuneate (8); laterally compressed; 3-6.375-12 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes glabrous (11/86), or sparsely hairy (4/86), or pubescent (25/86), or pilose (47/86), or villous (2/86). Floret callus glabrous (2/73), or pubescent (61/73), or pilose (7/73), or bearded (3/73); truncate (1), or obtuse (86).
    Glume
    Glumes persistent; shorter than spikelet (56), or reaching apex of florets (31), or exceeding apex of florets (9); thinner than fertile lemma (83), or similar to fertile lemma in texture (4), or firmer than fertile lemma (1); parallel to lemmas (9), or gaping (78). Lower glume linear (6), or lanceolate (63), or elliptic (14), or oblong (5), or ovate (4); 0.25-1.636-75 length of upper glume; hyaline (5), or membranous (82); 1-keeled (86/86); 1 -veined (66/78), or 2 -veined (7/78), or 3 -veined (19/78). Lower glume lateral veins absent (65), or obscure (6), or distinct (22). Lower glume surface smooth (85), or asperulous (1), or scabrous (1). Lower glume apex obtuse (1/86), or acute (62/86), or acuminate (22/86), or attenuate (1/86), or setaceously attenuate (6/86); muticous (85), or mucronate (2), or awned (1). Upper glume linear (1), or lanceolate (46), or elliptic (33), or oblong (7), or ovate (8), or obovate (1); 0.66-1.039-2.5 length of adjacent fertile lemma; hyaline (5), or membranous (82); with undifferentiated margins (77), or hyaline margins (10); 1-keeled (86/86); 1 -veined (2/79), or 2 -veined (1/79), or 3 -veined (77/79), or 4 -veined (2/79), or 5 -veined (3/79). Upper glume primary vein eciliate (84), or ciliolate (1), or ciliate (2). Upper glume surface smooth (85), or asperulous (1), or scabrous (1). Upper glume apex entire (86), or erose (1); obtuse (3/86), or acute (69/86), or acuminate (14/86), or setaceously attenuate (6/86); muticous (84), or mucronate (2), or awned (1); 1 -awned (1/1).
    Florets
    Fertile lemma lanceolate (19), or elliptic (32), or oblong (32), or ovate (3), or obovate (3); membranous (80), or chartaceous (4), or cartilaginous (3); of similar consistency above (73), or much thinner above (14); of similar consistency on margins (70), or much thinner on margins (17); without keel (5), or keeled (82); 3 -veined (2), or 5 -veined (85), or 6-7 -veined (1). Lemma midvein without distinctive roughness (81), or scaberulous (5), or scabrous (1); eciliate (86), or ciliate (1). Lemma lateral veins obscure (4/6), or prominent (2/6); excurrent (6/6), or extending close to apex (1/6). Lemma surface smooth (51), or asperulous (12), or scaberulous (11), or scabrous (8), or papillose (6); unwrinkled (86), or rugose (1); glabrous (75), or puberulous (2), or pubescent (7), or pilose (4), or hirsute (2). Lemma apex entire (7), or dentate (80), or lobed (1); 2 -fid (79/81), or 3 -fid (1/81), or 4 -fid (3/81); incised 0.15-0.24-0.33 of lemma length; obtuse (2/6), or acute (3/6), or acuminate (1/6), or setaceously attenuate (1/6); muticous (3), or mucronate (2), or awned (85); 1 -awned (70/85), or 3 -awned (14/85), or 5 -awned (1/85). Principal lemma awn subapical (3), or dorsal (84); straight (13), or curved (30), or flexuous (3), or geniculate (52); limb glabrous (85), or puberulous (1), or ciliate (1). Column of lemma awn glabrous (50/52), or puberulous (1/52), or pubescent (1/52). Lateral lemma awns shorter than principal (1/1). Palea embraced by lemma (7), or gaping (80); 0.5-0.8636-1 length of lemma; hyaline (82), or membranous (5). Palea keels smooth (49), or scaberulous (37), or scabrous (2); eciliate (77), or ciliolate (6), or ciliate (4). Palea surface glabrous (85), or pubescent (1), or pilose (1). Palea apex erose (1/3), or dentate (2/3); muticous (80), or with excurrent keel veins (7). Apical sterile florets resembling fertile though underdeveloped (6/8), or distinct from fertile (2/8).
    Flowers
    Lodicules 2 (26/26); membranous (5/5); glabrous (24/26), or ciliate (3/26); entire (1/4), or 2-toothed (4/4); emarginate (1/2), or truncate (1/2). Anthers 3. Ovary glabrous (41/49), or with a few apical hairs (1/49), or pubescent on apex (7/49), or pubescent all over (1/49).
    Fruits
    Caryopsis with adherent pericarp (78/78); linear (1/5), or fusiform (3/5), or oblong (1/5); apex rostrate (1/1). Embryo 0.2 length of caryopsis. Hilum punctiform (54/56), or elliptic (1/56), or linear (1/56).
    Distribution
    Europe (19), or Africa (2), or Temperate Asia (24), or Tropical Asia (8), or Australasia (10), or Pacific (3), or North America (21), or South America (26), or Antarctica (1).

    Images

    Distribution

    Native to:

    Afghanistan, Alaska, Albania, Alberta, Aleutian Is., Algeria, Altay, Amur, Antipodean Is., Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Austria, Azores, Baltic States, Belarus, Belgium, Bolivia, Borneo, Brazil South, Brazil Southeast, British Columbia, Bulgaria, Buryatiya, California, Canary Is., Central European Rus, Chatham Is., Chile Central, Chile North, Chile South, China North-Central, China South-Central, China Southeast, Chita, Colombia, Colorado, Connecticut, Corse, Costa Rica, Czechoslovakia, Dominican Republic, East European Russia, East Himalaya, Ecuador, Falkland Is., Finland, France, Germany, Great Britain, Greece, Greenland, Guatemala, Haiti, Hawaii, Honduras, Hungary, Iceland, Idaho, Inner Mongolia, Iran, Iraq, Ireland, Irkutsk, Italy, Japan, Juan Fernández Is., Kamchatka, Kazakhstan, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Kriti, Kuril Is., Labrador, Lebanon-Syria, Magadan, Maine, Manchuria, Manitoba, Masachusettes, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mongolia, Montana, Morocco, Nepal, Netherlands, Nevada, New Brunswick, New Guinea, New Hampshire, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Newfoundland, North Carolina, North Caucasus, North European Russi, Northwest European R, Northwest Territorie, Norway, Nova Scotia, Nunavut, Ontario, Oregon, Pakistan, Panamá, Pennsylvania, Peru, Poland, Portugal, Primorye, Qinghai, Queensland, Québec, Rhode I., Romania, Sakhalin, Sardegna, Saskatchewan, Sicilia, South Dakota, South European Russi, Spain, Svalbard, Sweden, Switzerland, Tadzhikistan, Taiwan, Tasmania, Tennessee, Tibet, Transcaucasus, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Tuva, Ukraine, Utah, Uzbekistan, Venezuela, Vermont, Victoria, Virginia, Washington, West Himalaya, West Siberia, Wisconsin, Wyoming, Xinjiang, Yakutskiya, Yugoslavia, Yukon

    Introduced into:

    Kansas, Kerguelen, Mississippi, Missouri, New Jersey, Oklahoma

    Trisetum Pers. appears in other Kew resources:

    First published in Syn. Pl. 1: 97 (1805)

    Sources

    GrassBase - The Online World Grass Flora
    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/
    © 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/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0