Summary ⁴

Dense-flowered Knotweed is an annual or perennial herb with red, ascending, swollen stems, often rooting at the nodes, 5-15 cm long, not hairy. Leaves are oblong-lanceolate to narrowly lanceolate, 14-28 cm long, k3-6 cm wide, minutely pustulate, otherwise usually smooth, sometimes with scattered hairs on nerves of lower surface. Leaf stalk is 0.5-2 cm long, ocreae tubular, usually 20-30 mm long, apex not ciliate, sometimes with a few small bristles. Flowers in open racemes, sometimes in paniculate inflorescences 5-10 cm long, each flower on a jointed pedicel; tepals white or pinkish, 3-4 mm long, sometimes sparsely so, glandular punctate. Nuts dark brown to nearly back, broadly ovoid, biconvex or subtrigonous, 2-2.5 mm long, the surface glossy.
(Source: Flowers of India)

Sources and Credits

1. (c) Kerry Wixted, some rights reserved (CC BY-NC), https://www.flickr.com/photos/kwixted0/3882571597/
2. (c) Kerry Wixted, some rights reserved (CC BY-NC), https://www.flickr.com/photos/kwixted0/3883364026/
3. (c) Kerry Wixted, some rights reserved (CC BY-NC), https://www.flickr.com/photos/kwixted0/3882570699/
4. (c) Melissa McMasters, some rights reserved (CC BY-SA)

More Info

• iNat taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• eFloras.org
• Flora of North America (beta)
• Global Biodiversity Information Facility (GBIF)
• HOSTS - a Database of the World's Lepidopteran Hostplants
• IPNI (with links to POWO, WFO, and BHL)
• NatureServe Explorer 2.0
• SEINet Symbiota portals
• Tropicos
• USDA PLANTS database
• World Flora Online

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