1. Family: Poaceae Barnhart
    1. Piptochaetium J.Presl

      1. This genus is accepted, and its native range is E. Canada to Guatemala, Venezuela to W. South America, SE. & S. Brazil to S. south America.

    [GB]

    nonem

    Habit
    Perennial. Rhizomes absent (36), or short (1). Culms erect (19/19), or geniculately ascending (6/19); slender (3/3); 10-51.06-150 cm long; compressible (1), or firm (35), or wiry (1). Culm-internodes elliptical in section (1/1). Culm-nodes constricted (2/3), or swollen (1/3). Lateral branches lacking (3/3). Ligule an eciliate membrane. Leaf-blades filiform (18), or linear (19); stiff (2), or firm (35).
    Inflorescences
    Inflorescence a panicle; exserted (34), or embraced at base by subtending leaf (9). Panicle open (22), or contracted (15). Primary panicle branches not whorled (34), or whorled at lower nodes (3). Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform (4/4).
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear (2), or lanceolate (4), or oblong (29), or obovate (2); laterally compressed (29), or subterete (8); 2.49-8.85-30 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief (17), or evident (6), or elongated (14); glabrous (4/36), or sparsely hairy (2/36), or pubescent (18/36), or pilose (13/36), or bearded (1/36); truncate (1), or obtuse (19), or acute (6), or pungent (11).
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear (2), or lanceolate (4), or oblong (29), or obovate (2); laterally compressed (29), or subterete (8); 2.49-8.85-30 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief (17), or evident (6), or elongated (14); glabrous (4/36), or sparsely hairy (2/36), or pubescent (18/36), or pilose (13/36), or bearded (1/36); truncate (1), or obtuse (19), or acute (6), or pungent (11).
    Glume
    Glumes persistent; shorter than spikelet (1), or reaching apex of florets (3), or exceeding apex of florets (34); thinner than fertile lemma; parallel to lemmas (35), or gaping (2). Lower glume lanceolate (21), or elliptic (3), or oblong (1), or ovate (11), or obovate (1); 0.75-1.043-1.5 length of upper glume; hyaline (27), or membranous (10); without keels; 1 -veined (2/35), or 2 -veined (1/35), or 3 -veined (14/35), or 4 -veined (7/35), or 5 -veined (26/35), or 6-7 -veined (3/35), or 8-9 -veined (1/35). Lower glume lateral veins absent (2), or distinct (36). Lower glume surface smooth, or asperulous (2). Lower glume apex obtuse (1/36), or acute (3/36), or acuminate (21/36), or attenuate (4/36), or setaceously attenuate (8/36); muticous (28), or awned (9). Upper glume lanceolate (21), or elliptic (2), or oblong (2), or ovate (11), or obovate (1); 0.75-1.15-1.5 length of adjacent fertile lemma; hyaline (27), or membranous (10); with undifferentiated margins (33), or hyaline margins (4); without keels; 1 -veined (2/35), or 2 -veined (1/35), or 3 -veined (16/35), or 4 -veined (7/35), or 5 -veined (24/35), or 6-7 -veined (3/35), or 8-9 -veined (1/35). Upper glume surface smooth, or asperulous (2). Upper glume apex obtuse (1), or acute (4), or acuminate (21), or attenuate (4), or setaceously attenuate (7); muticous (28), or awned (9); 1 -awned (9/9).
    Florets
    Fertile lemma linear (2), or elliptic (1), or oblong (14), or orbicular (2), or obovate (14), or oblanceolate (5); laterally compressed (29), or subterete (8); not gibbous (17), or gibbous (20); coriaceous (6), or indurate (31); without keel (33), or keeled (4); 5 -veined (6/6). Lemma lateral veins without ribs (36), or ribbed (1). Lemma surface smooth (15), or granulose (1), or scaberulous (2), or scabrous (1), or papillose (10), or tuberculate (4), or striate (9); without grooves (36), or with a median groove (1); glabrous (25), or pubescent (10), or pilose (2); without hair tufts (36), or with conspicuous apical hairs (1). Lemma margins involute (33), or convolute (4); covering most of palea (4), or interlocking with palea keels (33). Lemma apex truncate (9/9); without ornament (30), or scabrous (6), or pubescent (1); without appendage (13), or with an annular corona (6), or with a membranous corona (4), or surmounted by a ring of hairs (14), or with a short cylindrical neck (1), or with a conical beak (1); awned; 1 -awned. Principal lemma awn median (14), or eccentric (23); straight (1), or flexuous (3), or geniculate (8), or bigeniculate (27); limb glabrous (36), or puberulous (1). Column of lemma awn glabrous (15/33), or puberulous (11/33), or pubescent (7/33). Palea embraced by lemma (35), or reflexed at apex (2); 0.9-0.9969-1 length of lemma; 2 -veined (33/33); without keels (4), or 2-keeled (33). Palea keels separated (2/33), or contiguous above a sulcus (31/33). Palea surface glabrous (36), or pubescent (1).
    Flowers
    Lodicules 2 (6/14), or 3 (8/14). Anthers 3 (20/20). Stigmas 2 (6/6). Ovary glabrous (3/3).
    Fruits
    Caryopsis with adherent pericarp (31/31); fusiform (3/11), or oblong (1/11), or orbicular (4/11), or obovoid (3/11); laterally compressed (1/1). Embryo 0.2-0.2933-0.4 length of caryopsis. Hilum linear (22/22); 0.7-0.9682-1 length of caryopsis.
    Distribution
    Australasia (3), or North America (9), or South America (29).

    Images

    Distribution

    Native to:

    Alabama, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Bolivia, Brazil South, Brazil Southeast, Chile Central, Chile South, Colombia, Connecticut, Delaware, District of Columbia, Ecuador, Florida, Georgia, Guatemala, Indiana, Juan Fernández Is., Kentucky, Louisiana, Maryland, Masachusettes, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Mississippi, Missouri, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Ontario, Paraguay, Pennsylvania, Peru, Rhode I., South Carolina, Tennessee, Texas, Uruguay, Venezuela, Virginia, West Virginia

    Introduced into:

    California, Victoria

    Piptochaetium J.Presl appears in other Kew resources:

    First published in C.B.Presl, Reliq. Haenk. 1: 222 (1830)

    Accepted by

    • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

    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 2020. 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 2020. 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