Comments
provided by eFloras
C. L. Hitchcock (1964) suggested that Polygonum nuttallii is but a small-flowered form of P. spergulariiforme. Although morphologically similar, P. nuttallii differs from P. spergulariiforme in some respects, including its wiry, purplish stems, short and funnelform ocreae, adaxially glaucous leaves, longer bracts, shorter fruiting perianth, and achenes.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
provided by eFloras
Herbs. Stems spreading to erect, sometimes zigzagged, purplish, simple or branched, wiry, (5-)10-35 cm, papillose-scabridulous. Leaves evenly distributed or crowded at branch tips, articulated to ocreae, basal leaves persistent, distal leaves gradually reduced to bracts; ocrea 3-4 mm, papillose-scabridulous, proximal part funnelform, distal part finely lacerate; petiole 0.1-2 mm; blade 1-veined, not pleated, linear to narrowly oblong-elliptic, 8-30 × 1-4(-7) mm, margins narrowly revolute, never touching along midrib, smooth, apex acute, mucronate, ± glaucous adaxially. Inflorescences axillary and terminal, spikelike, dense; cymes mostly congested toward tips of branches, 2-3-flowered. Pedicels enclosed in ocreae, erect to spreading, 2-3 mm. Flowers semi-open or closed; perianth 1.8-2.4 mm; tube 25-33% of perianth length; tepals overlapping, greenish, white, or pink with pink margins, petaloid, oblong, cucullate, navicular in distal 1/ 4, apex rounded; midveins unbranched; stamens 8. Achenes enclosed in perianth, black, elliptic to ovate, 1.8-2.3 mm, faces subequal, shiny, smooth.
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Habitat
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Dry prairies, open knolls in lower mountains, open sites in lowland and montane zones, sandy soil; 800-1100m.
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Synonym
provided by eFloras
Polygonum intermedium Nuttall ex S. Watson, Proc. Amer. Acad. Arts 17: 378. 1882, not Ehrhart 1791; P. douglasii Greene subsp. nuttallii (Small) J. C. Hickman
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Polygonum nuttallii: Brief Summary
provided by wikipedia EN
Polygonum nuttallii is a North American species of flowering plant in the buckwheat family known by the common name Nuttall's knotweed. It grows in the Pacific Northwest, in British Columbia, Washington, and Oregon.
Polygonum nuttallii is an herb up to 35 cm (14 in) tall. Stems are thin and wiry. Flowers are white or pink.
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Polygonum nuttallii: Brief Summary
(
Vietnamese
)
provided by wikipedia VI
Polygonum nuttallii là một loài thực vật có hoa trong họ Rau răm. Loài này được Small miêu tả khoa học đầu tiên năm 1895.
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