1. Family: Poaceae Barnhart
    1. Amphicarpum Kunth

      1. This genus is accepted, and its native range is E. U.S.A.

    [GB]

    nonem

    Habit
    Annual (1), or perennial (1). Rhizomes absent (1), or elongated (1). Culms erect, or geniculately ascending (1); 10-47.5-80 cm long; rooting from lower nodes (1/1). Lateral branches sparse (1/1). Ligule a fringe of hairs. Leaf-blades linear (1), or lanceolate; herbaceous, or coriaceous (1). Leaf-blade margins cartilaginous (1/1).
    Inflorescences
    Inflorescence a panicle, or composed of racemes (1). Panicle open. Racemes single (1/1), or borne along a central axis (1/1). Spikelets appressed (1/1), or ascending (1/1); solitary. Fertile spikelets pedicelled. Pedicels filiform.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 6-7-8 mm long; falling entire.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 6-7-8 mm long; falling entire.
    Glume
    Glumes one the lower absent or obscure (1), or two (1); shorter than spikelet, or reaching apex of florets (1); thinner than fertile lemma. Lower glume ovate (1/1); membranous (1/1), or scarious (1/1); without keels (1/1); 1 -veined (1/1). Lower glume lateral veins absent (1/1). Lower glume apex obtuse (1/1). Upper glume lanceolate; 0.9-0.925-1 length of adjacent fertile lemma; membranous; without keels; 5 -veined (1), or 7 -veined (1). Upper glume apex acute.
    Florets
    Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; membranous; 5 -veined; acute. Fertile lemma elliptic (1), or oblong (1); coriaceous (1), or indurate; of similar consistency on margins (1), or much thinner on margins (1); without keel; 5 -veined. Lemma margins flat (1), or involute (1). Lemma apex apiculate. Palea 1 length of lemma; indurate; 2 -veined (1/1).
    Flowers
    Lodicules 2 (1/1); fleshy (1/1). Anthers 3 (1/1). Stigmas 2 (1/1). Ovary glabrous (1/1).
    Cleistogene
    Cleistogenes present; underground.
    Distribution
    North America.
    [FTEA]

    Leguminosae, J. B. Gillett, R. M. Polhill & B. Verdcourt. Flora of Tropical East Africa. 1971

    Habit
    Climbing herbs
    Leaves
    Leaves pinnately 3-foliolate; stipules and stipels present
    Inflorescences
    Inflorescences axillary, racemose, sometimes cleistogamous apetalous flowers present also, either at the base of the normal racemes or 1–3 in the axils of lower leaves
    Calyx
    Calyx tubular, appearing 4-toothed, the 2 vexillary lobes being entirely connate
    Corolla
    Corolla small, white, purple or blue; standard obovate, slightly auriculate, glabrous
    Stamens
    Vexillary stamen free; anthers uniform or, in cleistogamous flowers, only 2–5 fertile
    Pistil
    Ovary sessile or shortly stalked, many-ovuled; style filiform, bent, not bearded; stigma small, terminal or in cleistogamous flowers the stigma is bent into contact with the anthers, the style being very short
    Fruits
    Pod linear or falcate, compressed, not septate; geocarpous indehiscent 1-seeded fruits sometimes present in American species
    Seeds
    Seeds subglobose or ovoid; hilum short, lateral; aril not developed.

    Images

    Distribution

    Native to:

    Alabama, Delaware, Florida, Georgia, Maryland, Masachusettes, New Jersey, New York, North Carolina, South Carolina, Virginia

    Amphicarpum Kunth appears in other Kew resources:

    First published in Révis. Gramin. 1: 28 (1829)

    Not accepted by

    • Soreng, R.J., Davidse, G., Peterson, P.M., Zuloaga, F.O., Judziewicz, E.J., Filgueiras, T.S. & Morrone, O. (eds.) (2005). Catalogue of New World Grasses project. TROPICOS,the Missouri Botanical Garden's on-line taxonomic database http://mobot.mobot.org/W3T/Search/nwgc.html. [Cited as Amphicarpum amphicarpon.]

    Literature

    Flora of Tropical East Africa
    • Turner & Fearing in Southwest. Nat. 9: 207 (1964), nom. conserv. (Amphicarpaea, conserv. spelling)
    • Gen. N. Am. Pl. 2: 113 (Apr. 1818)
    • S. Elliott in Journ. Acad. Nat. Sci. Philadelphia 1: 372 (Sept. 1818)

    Sources

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

    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