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Bouteloua gracilis (blue grama)
...(1999), but specimens are unknown. Wool waste, disturbed ground. Reports of Bouteloua hirsuta Lag. in New England are based on collections of this species— Parlin 1521 ( GH!, ...
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Ophioglossum pusillum (northern adder's-tongue fern)
... 15.0 mm–190.0 mm. Leaf stalk scales: there are no scales on the leaf stalk. Lobe or leaflet shape: ...
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Bassia hyssopifolia (five-horned smotherweed)
...around 1915 in Nevada, and around 1930 it was introduced to New England via Boston shipping yards. It currently inhabits disturbed beaches and waste areas, and is more widespread in the West, where it...
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Myriophyllum spicatum (Eurasian water-milfoil)
...in 1987. It can thrive in a wide range of conditions, and it outcompetes native plants and animals. It spreads rapidly, propagating from seeds, roots, and stem fragments, the latter developing roots e...
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Myriophyllum sibiricum (northern water-milfoil)
... 1. Underwater leaf length: 10.0 mm–50.0 mm. Underground organs: the plant has a rhizome (a ...
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Anaphalis margaritacea (pearly everlasting)
...21-50. Disk flower number: more than 50. Width of flower head base: 6.0 mm–10.0 mm. ...
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Carex cephalophora (oval-headed sedge)
... 1.4 mm–1.5 mm. Perigynium width: 1.4 mm–2.0 mm. Spike orientation: the spikes are orient...
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Carduus acanthoides (spiny plumeless-thistle)
... 11.0 mm–13.0 mm. Underground organs: there is a thickened taproot on the plant. Leaf tip extension: ...
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Linaria repens (striped toadflax)
... 1.0 None–1.0 None. Hairs between stem nodes: the stem has no hairs between the nodes. Corolla morphology: ...
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Maianthemum trifolium (three-leaved false Solomon's-seal)
... 1.0 None–1.0 None. Hairs on flower stalk: the flower stalk has no hairs on it. Wetland Status: Occurs only i...