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Pedicularis canadensis (Canadian lousewort, forest lousewort)
... 1.0 None–1.0 None. Stamen position relative to petals: NA. Anther opening: the ant...
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Capsella bursa-pastoris (shepherd's-purse)
... 1.1 NA–1.5 NA. Petal base: the petal narrows abruptly at the base. Leaf sheath length: 0.0 ...
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Hibiscus moscheutos (swamp rose-mallow)
... 1.0 None–1.0 None. Hairs on upper side of leaf: the upper side of the leaf is not hairy, or it has very few hairs. ...
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Sisymbrium altissimum (tumbling hedge-mustard)
... 1. Leaf form: the leaves are green, with an expanded blade and a leaf-like texture. Number of styles: ...
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Orthilia secunda (one-sided-shinleaf)
... 1.2 mm–1.8 mm. Stamen lengths differ: the stamens are all approximately the same length. Flower petal color:...
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Oenothera biennis (common evening-primrose)
... 1.1 mm–2.0 mm. Plant color: the leaves or young stems of the plant are green. Number of styles: ...
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Viola sagittata (arrowhead violet)
... 1.0 NA–1.0 NA. Seed relative length: the seed is longer than it is wide. Marks on petals: ...
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Hypericum ellipticum (pale St. John's-wort)
...petals 10–13 mm long, strongly asymmetrical, relatively straight on one margin and strongly convex on the other margin, and stamens numbering 120–200, deciduous (vs. H. ellpticum, with sepals subequal...
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Galeopsis bifida (split-lipped hemp-nettle)
...mostly 13-15 mm long).: Galeopsis ladanum petals mostly 15-23 mm long, usually white, the central lower lobe without an obvious notch (vs. G. bifida, with petals mostl...
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Draba verna (spring draba, spring whitlow-mustard)
... 1.5 mm–6.0 mm. Petal appearance: the petals are thin and delicate, and pigmented (colored other than green or brown). ...