. 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. 13. Polygonum tenue Michx. Slender Knotweed. Fig. 1627. Polygonum tenue Michx. Fl. Bor. Am. 1: 238. 1803. Annual, glabrous, somewhat rough about the nodes, stem very slender or filiform, erect, simple or branched, somewhat 4-angled, 4'-i2' tall. Leaves linear or linear-lanceolate, sessile, acuminate at the apex, 2"-i2" long, articulated to the ocreae,
. 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. 13. Polygonum tenue Michx. Slender Knotweed. Fig. 1627. Polygonum tenue Michx. Fl. Bor. Am. 1: 238. 1803. Annual, glabrous, somewhat rough about the nodes, stem very slender or filiform, erect, simple or branched, somewhat 4-angled, 4'-i2' tall. Leaves linear or linear-lanceolate, sessile, acuminate at the apex, 2"-i2" long, articulated to the ocreae, i-ribbed with a lateral impression on each side of the rib, the margins minutely scabrous or serrulate; ocreae fun- nelform, soon lacerate; flowers several in the axil- lary clusters, green, subsessile; sepals whitish; sta- mens 8; fruit erect; achene 3-angled, black, i"-ii" long, reticulated on the angles, the centre of its faces smooth. Dry soil, Ontario to Minnesota, Nebraska, Georgia and Arkansas. July-Sept. 14. Polygonum Douglasii Greene. Doug- las' Knotweed. Fig. 1628. Polygonum Douglasii Greene, Bull. Cal. Acad. (II.) 1: 125. 1885. Annual, similar to the preceding species, gla- brous, somewhat rough at the nodes, sometimes slightly glaucous, stem erect, 8'-i8' tall, simple or usually much branched, almost terete. Leaves oblong or narrowly lanceolate, ¥-2' long, sub- sessile, rather thin, flat or revolute, with no lateral impressions parallel to the midrib; ocreae oblique, short, soon lacerate; clusters axillary, several-flowered; the flowers and fruit deflexed; sepals green with white or rose-colored margins; stamens 8; achene 3-angled, ii"-2" long, oblong or ovoid-oblong, black, smooth and shining. Northwest Territory and British Columbia to New Mexico, Nebraska and Oklahoma, east through On- tario and New York to Vermont. June-Sept. 6. TOVARA Adans. Fam. PI. 2: 276. 1763. Annual or perennial herbaceous plants, becoming somewhat woody below. Stem m
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
