. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 676 POLYGONACEAE. Vol. I. 1. Pleuropterus Zuccarinii Small. Japanese Knotweed. Fig. 1655. Polygonum cuspidatum Sieb. & Zucc. Fl. Jap. Fam. Nat. 2:84. 1846. Not Willd. 1825. Polygonum Zuccarinii Small, Mem. Dept. Bot. Col. Coll. 1: 158. pi. 66. 1895. Perennial, glabrous, more or less scurfy, stem stout, erect, woody below, terete or slightly angled, much bra
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 676 POLYGONACEAE. Vol. I. 1. Pleuropterus Zuccarinii Small. Japanese Knotweed. Fig. 1655. Polygonum cuspidatum Sieb. & Zucc. Fl. Jap. Fam. Nat. 2:84. 1846. Not Willd. 1825. Polygonum Zuccarinii Small, Mem. Dept. Bot. Col. Coll. 1: 158. pi. 66. 1895. Perennial, glabrous, more or less scurfy, stem stout, erect, woody below, terete or slightly angled, much branched, 4°-8° tall. Leaves oblong-ovate or ovate-lanceolate, petioled, 2'-6' long, acuminate- cuspidate at the apex, truncate or subcordate at the base, reticulate-veined on both surfaces, their mar- gins undulate; ocreae oblique, smooth, fugacious; racemes mostly terminal, panicled, 2'-4' long, or axillary, many-flowered, more or less pubescent; flowers greenish-white, long-pedicelled; outer seg- ments of the S-parted calyx very broadly winged in fruit; stamens 8; style 3-parted; achene 3-angled, narrowly oblong or oblong-pyramidal, \\"-i\" long, black, smooth, shining. Escaped from cultivation locally throughout our range. Native of Japan. 13. POLYGONELLA Michx. Fl. Bor. Am. 2: 240. 1803. Annual or perennial glabrous herbs, sometimes slightly woody, with erect branched usually conspicuously jointed stems, alternate narrow leaves articulated to the ocreae, and small white or greenish flowers in slender panicled racemes. Calyx unequally s-parted, persistent, its segments petalloid, loosely investing the achene or its base in fruit, the three inner calyx-segments often winged. Stamens 8, included; filaments filiform, or much dilated or auricled at the base. Style 3-parted, short or almost wanting; stigmas capitate; ovary i-celled; ovule solitary. Achene 3-angled, smooth. Embryo slender, nearly straight, in one of the angles of the seed. [Diminutive of Polyg
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