1. Family: Poaceae Barnhart
    1. Olmeca Soderstr.

      1. This genus is accepted, and its native range is S. Mexico to Honduras.

    [GB]

    nonem

    Spikelets
    Spikelets comprising 0-1 basal sterile florets (1/1); 1 fertile florets (1/4), or 2 fertile florets (2/4), or 5 fertile florets (1/4), or 6-8 fertile florets (2/4), or 9-12 fertile florets (1/4); with a barren rhachilla extension (1/4), or with diminished florets at the apex (3/4). Spikelets linear (4/4), or lanceolate (2/4); laterally compressed (2/4), or subterete (2/4); 16.6-25.57-40 mm long; breaking up at maturity (4/4); disarticulating below each fertile floret (4/4). Rhachilla internodes brief up to lowest fertile floret (3/4), or elongated below proximal fertile floret (1/4); glabrous (1/4), or sparsely hairy (1/4), or pubescent (3/4).
    Fertile
    Spikelets comprising 0-1 basal sterile florets (1/1); 1 fertile florets (1/4), or 2 fertile florets (2/4), or 5 fertile florets (1/4), or 6-8 fertile florets (2/4), or 9-12 fertile florets (1/4); with a barren rhachilla extension (1/4), or with diminished florets at the apex (3/4). Spikelets linear (4/4), or lanceolate (2/4); laterally compressed (2/4), or subterete (2/4); 16.6-25.57-40 mm long; breaking up at maturity (4/4); disarticulating below each fertile floret (4/4). Rhachilla internodes brief up to lowest fertile floret (3/4), or elongated below proximal fertile floret (1/4); glabrous (1/4), or sparsely hairy (1/4), or pubescent (3/4).
    Glume
    Glumes persistent (4/4); shorter than spikelet (4/4); thinner than fertile lemma (2/4), or similar to fertile lemma in texture (2/4). Lower glume lanceolate (4/4); 0.6-0.8167-1 length of upper glume; membranous (2/4), or chartaceous (2/4); without keels (2/4), or 1-keeled (2/4); 1 -veined (2/3), or 2 -veined (1/3), or 3 -veined (2/3). Lower glume lateral veins absent (1/4), or distinct (4/4). Lower glume apex acute (2/3), or acuminate (1/3); muticous (2/4), or mucronate (1/4), or awned (1/4). Upper glume lanceolate (4/4); 0.33-0.6083-0.75 length of adjacent fertile lemma; membranous (2/4), or chartaceous (2/4); without keels (3/4), or 1-keeled (1/4); 5 -veined (3/3), or 6-7 -veined (2/3). Upper glume apex acute (2/3), or acuminate (1/3); muticous (3/4), or awned (1/4); 1 -awned (1/1).
    Florets
    Basal sterile florets barren (1/1); with palea (1/1). Lemma of lower sterile floret lanceolate (1/1); 11-13 -veined (1/1); awned (1/1). Fertile lemma lanceolate (3/4), or elliptic (1/4); chartaceous (4/4); without keel (4/4); 7-9 -veined (2/4), or 10 -veined (1/4), or 11 -veined (2/4), or 12-13 -veined (1/4). Lemma surface glabrous (3/4), or pubescent (1/4). Lemma margins eciliate (2/4), or ciliolate (1/4), or ciliate (1/4). Lemma apex acute (4/4); muticous (2/4), or awned (2/4); 1 -awned (2/2). Palea 0.9-1-1.1 length of lemma; membranous (2/4), or chartaceous (2/4); 2 -veined (1/4), or 4 -veined (2/4), or 5 -veined (1/4), or 6 -veined (2/4). Palea keels eciliate (3/4), or ciliolate (1/4). Palea surface glabrous (1/4), or puberulous (1/4), or pubescent (3/4). Apical sterile florets resembling fertile though underdeveloped (2/3), or distinct from fertile (1/3).
    Flowers
    Lodicules 3 (4/4); membranous (2/2); ciliate (4/4). Anthers 3 (4/4). Stigmas 2 (4/4), or 3 (1/4). Ovary glabrous (1/1).
    Fruits
    Caryopsis with adherent pericarp (2/4), or fleshy pericarp (2/4); orbicular (2/2); isodiametric (2/2).
    Distribution
    North America, or South America (1).
    Habit
    Perennial. Rhizomes short (3), or elongated (2); pachymorph. Stolons absent (4), or present (1). Culms erect (1), or geniculately ascending (2), or rambling (1), or scandent (2); 300-795-1500 cm long; woody. Culm-internodes terete. Culm-nodes flush with internodes (1/1); without obvious supra-nodal ridge (1/3), or with distinct supra-nodal ridge (2/3). Lateral branches dendroid. Branch complement one; solitary. Culm-sheaths persistent; without auricles (1/3), or auriculate (2/3). Culm-sheath blade linear (2), or lanceolate (2), or triangular (1). Leaf-sheath auricles absent (3), or erect (1), or falcate (1). Ligule an eciliate membrane (2), or a ciliolate membrane (3). Leaf-blade base without a false petiole (1), or with a brief petiole-like connection to sheath (4). Leaf-blades filiform (1), or linear (4), or lanceolate (3), or oblong (1). Leaf-blade venation without cross veins (3), or with obscure cross veins (1), or with distinct cross veins (1).
    Inflorescences
    Inflorescence a panicle (4/4). Panicle open (4/4). Spikelets solitary (4/4). Fertile spikelets pedicelled (4/4).

    Distribution

    Native to:

    Honduras, Mexico Gulf, Mexico Southeast, Mexico Southwest

    Olmeca Soderstr. appears in other Kew resources:

    First published in Phytologia 51: 161 (1982)

    Accepted by

    • Govaerts, R. (2019). World Checklist of Vascular Plants (WCVP Database) The Board of 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