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Epilobium hornemannii (Hornemann's willow-herb)
...blades 10-25 mm long and 3-7 mm wide, usually entire, and outer surface of seeds smooth (vs. E. hornemannii, with leaf blades 19-40 mm long and 6-14 mm wide, weakly serrate, and seeds minutely papillo...
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Hypericum punctatum (spotted St. John's-wort)
...mm–1.1 mm. Leaf blade primary vein pattern: the secondary veins branch off at intervals from the primary vein. Filament surfa...
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Rorippa sylvestris (creeping yellow-cress)
...mm–1.0 mm. Petal glandular dots or scales: no. Inflorescence length: None mm–150.0 mm. ...
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Sabatia stellaris (annual rose-gentian, sea pink, sea pink)
... 1.0 NA–1.5 NA. Style petal-like: the styles are not petal-like. Length of flower stalk: 10.0 ...
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Rumex acetosella (common sheep sorrel, sheep dock)
...mm–1.3 mm. Petal length: 1.2 mm–2.0 mm. Leaf stalk: the leaves have no leaf stalks, but attach directly t...
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Cardamine bulbosa (bulbous bitter-cress)
... 1.7 mm–2.1 mm. Flower appearance: the flowers appear after the leaves have appeared. Final leaf segment widt...
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Oenothera oakesiana (Oakes' evening-primrose)
... 1.1 mm–1.2 mm. Schizocarpic fruit compression: NA. Placenta arrangement: the plant...
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Cardamine pensylvanica (Pennsylvania bitter-cress)
...mm–1.1 mm. Number of pistils: 1. Anther spurs: the anthers do not have spurs on them. ...
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Oenothera nutans (nodding evening-primrose)
... 1.2 mm–1.8 mm. Sepal length: 10.0 mm–30.0 mm. Number of pistils: 1. ...
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Hypericum mutilum (dwarf St. John's-wort)
...mm–1.0 mm. Upper lip of bilabiate corolla: NA. Stamen number: 10. Sepal te...