1. Family: Poaceae Barnhart
    1. Raddiella Swallen

      1. This genus is accepted, and its native range is Central & S. Tropical America to Trinidad.

    [GB]

    nonem

    Habit
    Annual (7), or perennial (1). Culms decumbent (2), or prostrate (2), or rambling (4); slender (1/3), or weak (2/3); 1-10.31-30 cm long; rooting from lower nodes (4/4). Culm-nodes swollen (2/2). Lateral branches ample (1/1). Ligule an eciliate membrane (5), or a ciliolate membrane (1), or a fringe of hairs (1), or absent (1). Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate (3), or elliptic (2), or ovate (4); membranous (7), or coriaceous (1).
    Inflorescences
    Monoecious; with male and female spikelets in the same inflorescence (3), or with male and female spikelets in different inflorescences (5). Inflorescence a panicle (1), or comprising only a few spikelets; terminal and axillary (1), or axillary (7); exserted (3), or embraced at base by subtending leaf (7). Sexes segregated (3/3); with male above (1/3), or below (2/3). Spikelets solitary. Fertile spikelets pedicelled. Male spikelets pedicelled; 1-11 in a cluster (1/1). Pedicels filiform (1/2), or oblong (1/2); tip cupuliform (2/2). Male inflorescence terminal (5/5); unlike female (5/5); a panicle (1/5), or of few spikelets (4/5). Male spikelets distinct from female; lanceolate (6), or elliptic (2). Male spikelet glumes absent, or 2 (1). Male spikelet lemma muticous.
    Spikelets
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic (6), or ovate (2), or obovate (1); dorsally compressed; 0.83-1.53-2.4 mm long; falling entire (5), or breaking up at maturity (3); disarticulating below each fertile floret (3/3). Spikelet callus square; incorporating lowest rhachilla internode with adnate lower glume. Rhachilla internodes elongated between glumes.
    Fertile
    Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic (6), or ovate (2), or obovate (1); dorsally compressed; 0.83-1.53-2.4 mm long; falling entire (5), or breaking up at maturity (3); disarticulating below each fertile floret (3/3). Spikelet callus square; incorporating lowest rhachilla internode with adnate lower glume. Rhachilla internodes elongated between glumes.
    Glume
    Glumes persistent (2/3), or deciduous (1/3); reaching apex of florets; thinner than fertile lemma; parallel to lemmas (7), or gaping (1). Lower glume linear (1), or elliptic (6), or ovate; 0.9-0.9875-1 length of upper glume; membranous (7), or herbaceous (1); without keels; 1-2 -veined (1), or 3 -veined, or 4-5 -veined (1). Lower glume lateral veins absent (1), or obscure (1), or distinct (7). Lower glume surface glabrous (2), or pubescent (3), or pilose (5). Lower glume apex acute (3), or acuminate (6). Upper glume lanceolate (1), or elliptic (6), or ovate; 1 length of adjacent fertile lemma; membranous (7), or herbaceous (1); with undifferentiated margins (7), or cartilaginous margins (1); without keels; 1 -veined (1), or 3 -veined, or 4-5 -veined (3). Upper glume surface glabrous (2), or pubescent (3), or pilose (5). Upper glume apex acute (3), or acuminate (6).
    Florets
    Fertile florets female. Fertile lemma lanceolate (1), or elliptic (4), or ovate (4), or obovate (1); not gibbous (7), or lunate in profile (1); cartilaginous (1), or indurate (7); without keel; 3 -veined (4/4), or 4-5 -veined (1/4). Lemma surface smooth (4), or papillose (4). Lemma margins involute; exposing palea (7), or covering most of palea (1). Lemma apex obtuse (1), or acute (6), or rostrate (1). Palea 1 length of lemma; cartilaginous (1), or indurate (7).
    Flowers
    Anthers 3 (7/7). Stigmas 2 (1/1).
    Fruits
    Caryopsis with adherent pericarp (7/7); ellipsoid (3/6), or oblong (1/6), or ovoid (2/6), or orbicular (1/6), or obovoid (1/6). Embryo 0.2-0.3167-0.5 length of caryopsis. Hilum punctiform (3/6), or elliptic (2/6), or linear (1/6); 0.25 length of caryopsis.
    Male
    Male inflorescence terminal (5/5); unlike female (5/5); a panicle (1/5), or of few spikelets (4/5). Male spikelets distinct from female; lanceolate (6), or elliptic (2). Male spikelet glumes absent, or 2 (1). Male spikelet lemma muticous.
    Distribution
    South America.

    Images

    Distribution

    Native to:

    Argentina Northeast, Bolivia, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Colombia, Costa Rica, Ecuador, French Guiana, Guyana, Nicaragua, Panamá, Paraguay, Peru, Suriname, Trinidad-Tobago, Venezuela

    Raddiella Swallen appears in other Kew resources:

    First published in Bull. Torrey Bot. Club 75: 89 (1948)

    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