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Iva annua (rough marsh-elder)
...3–10 mm long, and peduncles 1–3 mm long (vs. I. annua, with leaf blades adaxially strigose-scaberulous, axis of capitulescence pubescent, petioles mostly 5-20 mm long, and peduncles 0-1 mm long).: ...
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Hackelia deflexa (nodding stickseed)
... 1.0 None–1.0 None. Stipule features: NA. Sepal and petal color: the sepals are dif...
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Scorzoneroides autumnalis (fall-dandelion)
... 1. Scorzoneroides autumnalis (L.) Moench Efall-dandelion. 1a. Apargia autumnalis (L.) Hoffmann; Leontodon autumnalis L.; 1b. L...
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Schoenoplectus acutus (hard-stemmed club-bulrush)
... 1-4. Rhizome thickness: 5.0 mm–15.0 mm. Lifespan: the plant lives more than two years. ...
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Erucastrum gallicum (common dog-mustard)
...early 1900s and followed railroads across North America. It is especially abundant in the Midwest and Canadian prairie provinces, where it is a weed of cereal and oilseed crops. In New England, and is...
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Anthoxanthum hirtum (northern sweet grass)
...cm–110.0 cm. Inflorescence branches: the flowers are attached to branches rather than to the main axis of the inflorescence. ...
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Peritoma serrulata (stinking bee-plant)
...mostly 10–27 stamens, and fruit elevated on a gynophore mostly 0–2 mm long (vs. P. serrulata, with the petals entire at the apex, flowers with 6 stamens, and fruit elevated on a gynophore mostly 1–80 ...
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Carex atlantica (prickly bog sedge)
...(1.5–) 1.8–5.5 cm tall … 170a. C. atlantica var. atlantica1b. Widest leaf blades (0.65–) 0.8–1.6 mm wide; perigynia 1.9–3 mm long; inflorescences 0.8–2 cm tall … 170b....
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Potamogeton foliosus (leafy pondweed)
...0.1–0.5 mm wide, 1-veined, and beak of fruit ca. 0.1 mm long (vs. P. foliosus, with peduncles 0.5–6 cm long, leaf blades 0.3–2.3 mm wide, 1- to 5-veined, and beak of fruit 0.2-0.6 mm long).: ...
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Spiranthes casei (Case's ladies'-tresses)
... 1. Flower petal color: yellow. Length of narrowed base of lower petal: 0.0 mm–0.0 ...