. 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. 4. Polygonum exsertum Small. Long- fruited Knotweed. Fig. 1618. P. exsertum Small, Bull. Torr. Club 21: 172. 1894. Annual, glabrous, sometimes slightly glaucous, stem slender, brownish, erect or nearly so, con- spicuously striate, branched, i4°-3° tall. Leaves lan- ceolate, rarely oblanceolate, i'-ll' long, acute or cuspidate at the apex, acuminate at the base,
. 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. 4. Polygonum exsertum Small. Long- fruited Knotweed. Fig. 1618. P. exsertum Small, Bull. Torr. Club 21: 172. 1894. Annual, glabrous, sometimes slightly glaucous, stem slender, brownish, erect or nearly so, con- spicuously striate, branched, i4°-3° tall. Leaves lan- ceolate, rarely oblanceolate, i'-ll' long, acute or cuspidate at the apex, acuminate at the base, nearly sessile; ocreae soon lacerate, silvery, becoming brown- ish ; sepals 6, greenish, with white margins; stamens 5 or 6, included; achene stout, 3-angled, 2£"-3" long, more or less constricted above the middle, chestnut- brown, smooth, shining, 2-3 times as long as the calyx, at length twisted. In brackish marshes, New Brunswick to New Jersey; and on prairies and sand bars, Saskatchewan to Illinois and Nebraska. This is considered by " semiviviparous'" state of P. ramosissimum. 5. Polygonum aviculare L. Knot-grass. Door-weed. Pink-weed. Fig. 1619. Polygonum aviculare L. Sp. PI. 362. 1753. P. monspeliense Pers. Syn. 1: 439. 1805. Annual, pale green or bluish green, stem low or ascending, simple or branched, 4-2° long. Leaves broad, oblong to obovate-oblong, i3"-2o" long, short-petioled, narrowed at the base, usually acute at the apex or sometimes obtuse; ocreae silvery, at length lacerate; clusters 1-5-flowered; flowers relatively large, pedicelled; sepals 5, green, except the white, pink or purplish borders, i"-ii" long; stamens 5-8; achene 3-angled, ovoid, l£"-2" long, acute, striate-reticulated. A weed in cultiyated and waste grounds, common almost throughout North America, Asia and Europe. Bird-, beggar-, stone- or wire-weed. Door-, wire-, way- or crab-grass. Cow-, goose-, swine- or bird- grass. Bir
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
