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Aquilegia vulgaris (European columbine)
...eagle's claw, possibly in reference to the inwardly curling nectar spurs of the flowers or the claw-like groups of fruit it produces. The showy flowers range in color from purple to white, and n...
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Carya tomentosa (mockernut hickory)
...mostly 2-4.1 mm thick, and husk 2-5 mm thick (vs. C. tomentosa, with branchlets stout, mostly 4-9 mm thick, and husk of fruit 4-13 mm thick).: Carya glabra leaves with...
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Iris versicolor (blue iris)
...12–20 mm wide (vs. I. versicolor, with leaf blades 10–30 mm wide, stems solid, and petals 8–12 mm wide).: Iris sibirica Family: Iridaceae Genus: Iris
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Glyceria melicaria (northeastern manna grass)
... 2.2 mm–2.5 mm. Lemma tip shape: the lemma tip tapers to a narrow point (it may or may not also have an awn or teeth at the tip). ...
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Valerianella umbilicata (navel corn-salad)
...1.5–2 mm long, with lobes 0.4–0.8 mm long, and outer bracts of cymule spinulose-ciliate (vs. V. umbilicata, with the corolla 3–5 mm long, with lobes 1–2 mm long, and outer bracts of cymule usually eci...
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Amelanchier nantucketensis (Nantucket serviceberry, Nantucket shadbush)
...than 2 m and those that produce arrow-straight shoots ( A. spicata never exceeds 2 m in the wild and never produces arrow-straight shoots). Unfortunately, these forms of A. nantucketensi...
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Artemisia vulgaris (common wormwood)
... 20.0 mm–120.0 mm. Hairs on upper side of leaf blade: the upper side of the leaf is fuzzy or hairy. Leaf blad...
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Spergularia canadensis (Canada sand-spurry)
...stipules 2-4 mm long, and seeds 0.6-0.8 mm long (vs. S. canadensis, with flower stalks and sepals usually without hairs, stipules 1-2.8 mm long, and seeds 0.8-1.4 mm long).: Spergularia ma...
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Platanthera clavellata (little club-spur bog-orchid)
...with 2 basal teeth, often crenate or irregularly toothed over the margin, and stem with mostly 2 or 3 principal leaves (vs. P. clavellata, with the labellum without a protuberance, with 3 teeth or ver...
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Myriophyllum farwellii (Farwell's water-milfoil)
...fruits 2–2.5 mm long).: Myriophyllum pinnatum leaves alternate or sometimes some leaves subopposite, especially in submersed plants), fruit 0.7–1.2 mm long, and merica...