Species: Polygonum douglasii ssp. austiniae

Austin's Knotweed
Species

    Austin's Knotweed is a sparsely hairy annual with erect stems that are 3-10 cm high and branched near their bases. The alternate, narrowly egg-shaped to elliptic leaves are 5-15 mm long and 1/2-1/3 as wide. The lower leaves have short petioles, while the upper leaves are sessile and smaller. There are small membranous sheaths, or stipules, surrounding the stem at the point of leaf attachment. Groups of 1-4 tiny, nodding flowers occur in the axils of all but the lowest leaves. Each flower has 5-8 stamens and 5 petal-like tepals that are 2-3 mm long and green with white or pink margins. The shiny black achenes are 3-sided and mostly 2-2.5 mm long.

    Kingdom
    Plantae
    Phylum
    Anthophyta
    Class

    Dicotyledoneae

    Order

    Polygonales

    Family

    Polygonaceae

    Genus

    Polygonum

    Classification
    Other Global Common Names
    renouée d'Austin
    Informal Taxonomy
    Plants, Vascular - Flowering Plants - Buckwheat Family
    Formal Taxonomy
    Plantae - Anthophyta - Dicotyledoneae - Polygonales - Polygonaceae - Polygonum

    Austin's Knotweed is a sparsely hairy annual with erect stems that are 3-10 cm high and branched near their bases. The alternate, narrowly egg-shaped to elliptic leaves are 5-15 mm long and 1/2-1/3 as wide. The lower leaves have short petioles, while the upper leaves are sessile and smaller. There are small membranous sheaths, or stipules, surrounding the stem at the point of leaf attachment. Groups of 1-4 tiny, nodding flowers occur in the axils of all but the lowest leaves. Each flower has 5-8 stamens and 5 petal-like tepals that are 2-3 mm long and green with white or pink margins. The shiny black achenes are 3-sided and mostly 2-2.5 mm long.

    NatureServe Global Status Rank
    G5T4
    Global Status Last Reviewed
    1991-08-05
    Global Status Last Changed
    1991-08-05
    Conservation Status Map
    <img src="http://www.natureserve.org/explorer/servlet/GetMapGif?CA.AB=S1&CA.BC=S2&US.CA=SNR&US.ID=SNR&US.MT=S2&US.NV=SNR&US.OR=SNR&US.WA=S1&US.WY=S2" alt="Conservation Status Map" style="width: 475px; height: auto;" />
    ELEMENT_GLOBAL.2.152977