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Potentilla rivalis (brook cinquefoil)
...15–20 stamens bearing anthers 0.3–0.5 mm long, stems hirsute, and petals 2–5 mm long, slightly shorter than to subequal in length to the sepals (vs. P. rivalis, with the androecium with mostly 10 stam...
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Potamogeton vaseyi (Vasey's pondweed)
...Robbins. Vasey's pondweed. Aquatic Plants Non-Thalloid Aquatic Facts About: Vasey's pondweed is a regionally rare plant in New England that can be difficult to separate from sm...
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Aegilops cylindrica (jointed goat-grass)
...12-25 cm tall (vs. A. cylindrical, with leaf blades mostly 2-5 mm long and inflorescence a spike, 2.2-12 cm tall).: Tripsacum dactyloides Synonyms: ...
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Lepidium densiflorum (prairie pepperweed)
...or 2. Calyx symmetry: there are two or more ways to evenly divide the calyx (the calyx is radially symmetrical). Calyx symme...
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Alopecurus myosuroides (slender meadow-foxtail)
...mm–12.0 mm. Leaf blade width: 2.0 mm–6.0 mm. Anther length: 2.4 mm–4.1 mm. Spikelets s...
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Atriplex sibirica (Siberian orache)
...mostly 20--50 mm tall and brown fruits 1.5--2 mm wide (vs. A. sibirica, with terminal inflorescence up to 20 mm tall and brown fruits 2--2.5 mm wide).: Atriplex tatarica ...
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Salix alba (white willow)
...bracts 2.5–3 mm long, mature leaf blades often longer than 10 cm, 1.5–2 cm wide, and usually becomes glabrate on the abaxial surface. The “alba” form has branchlets and floral bracts similar to the p...
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Quercus alba (eastern white oak)
...1/2 or more of the nut (vs. Q. alba, with leaf blades cuneate at the base, on petioles 8–25 mm long, nut subsessile or on a peduncle mostly to 25 mm long, and carpellate involucre concealing usually +...
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Viburnum dentatum (smooth arrowwood)
... 2. Viburnum dentatum L. Nsmooth arrowwood. 2a. Viburnum recognitum Fern.; 2b. V. dentatum var. pubescens Ait.; Viburnum scabrellum Torr. & Gray ex Chapman var. venosum (Britt.) McAtee; V. ve...
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Cardamine concatenata (cut-leaved toothwort)
... 20.0 mm–48.0 mm. Tendrils: the plant does not have tendrils. Hairs between stem nodes: ...