Polygonum achoreum S.F.Blake
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Polygonaceae
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Scientific Name
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Description
Species Description - Annual to 5(–7) dm, homophyllous, erect at first, but often becoming prostrate with upturned branches; lvs bluish-green, oval to elliptic with rounded tip, mostly 10–35 × 3–15 mm; ocreae 4–10 mm, becoming brown and lacerate; perianth yellow-green, 2.5–3.7 mm, somewhat bottle-shaped and constricted above the achene, cleft only ca 1/3 its length, the 3 outer lobes narrow, curved, strongly cucullate; achenes 2.4–3.3 mm, yellow-green to tan, uniformly papillose; late- season achenes exsert, to 5 mm, olivaceous, smooth; 2n=40, 60. A weed in waste places, widespread in our region, w. to the Rocky Mts.