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Helminthotheca echioides (bristly ox-tongue)
...mm–12.0 mm. Peduncle length: 10.0 mm–50.0 mm. Leaf blade base shape: the base of the leaf blade is cuneat...
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Amelanchier arborea (downy servicberry, downy shadbush)
...7-10 mm long and stalks of fruit 5-10 mm long (vs. A. arborea, with the petals mostly 12-15 mm long and stalks of fruit 10-25 mm long).: Amelanchier canadensis leaf bl...
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Panicum philadelphicum (Philadelphia panicgrass)
...usually 1.4–1.8 mm long at maturity (vs. P. philadelphicum, with anthers mostly 0.8–1 mm long, uppermost leaf with a blade length to sheath length ratio of mostly 0.8–1.8, usually not enclosing the lo...
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Polypogon viridis (beardless rabbit's-foot grass)
...4–10 mm long, lemmas tipped by an awn mostly 0.5–1 mm long, and ligules 2.5–16 mm long (vs. P. viridis, with glumes unawned, lemmas unawned, and ligules up to 5 mm long).: Polypogon monspe...
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Xyris torta (slender yellow-eyed-grass)
... 1.0 None–1.0 None. Stamen number: 3. Flower petal color: pink to red. ...
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Solanum nigrum (European black nightshade)
...50–110 seeds 1.4–1.8 mm long, anthers 1.3–2 mm long, and inflorescence with usually 1–4 flowers (vs. S. nigrum, with berries 8–13 mm wide, with 15–60 seeds 1.8–2.2 mm long, anthers 1.8–2.5 mm long, an...
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Primula japonica (Japanese primrose)
... 1.0 None–1.0 None. Specific leaf type: the leaves are simple (i.e., lobed or unlobed but not separated into leaflets). ...
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Nuphar microphylla (small-leaved pond-lily)
... 13 or more. Inflorescence width: 10.0 mm–20.0 mm. Flower position: the flowers are above th...
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Bidens alba (white beggar-ticks)
...7-10 (vs. B. alba, with capitula with 5-8 ray flowers with well developed rays 5-16 mm long and involucral bracts numbering mostly 12).: Bidens pilosa Synonym...
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Liparis liliifolia (lily-leaved wide-lipped orchid)
...8–12 mm long, and fruiting pedicel 11–18 mm long, nearly as long as or slightly longer than the capsule).: Liparis loeselii Synonyms: Lep...