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Galium obtusum (blunt-leaved bedstraw)
...8–15 x 1–3 mm, spreading to deflexed, and mericarps 2–3 mm in diameter, smooth, usually both of the fruit developing (vs. G. obtusum, with leaf blades 10–30 x 1–6 mm, ascending to spreading, and meric...
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Valerianella radiata (beaked corn-salad)
...lobes 1–2 mm long, and outer bracts of cymule usually eciliate except sometimes near apex (vs. V. radiata, with the corolla 1.5–2 mm long, with lobes 0.4–0.8 mm long, and outer bracts of cymule spinul...
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Geum virginianum (cream-colored avens)
...(1999) is based on a collection of G. laciniatum var. laciniatum—1 Jul 1908, Kirk s.n. ( MASS!). Native to North America? Yes ...
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Potamogeton confervoides (alga-like pondweed, Tuckerman's pondweed)
...wide, 1- to 5-veined, and beak of fruit 0.2-0.6 mm long (vs. P. convfervoides, with peduncles mostly 5–25 cm long, leaf blades 0.1–0.5 mm wide, 1-veined, and beak of fruit ca. 0.1 mm long).: ...
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Euclidium syriacum (Syrian-mustard)
...white, 1–1.3 mm long, silicle pubescent with branched and unbranched hairs, and leaves petiolate or sessile, but not clasping).: Neslia paniculata Synonyms: ...
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Zostera marina (eel-grass, seawrack)
... 1.0 mm–2.0 mm. Leaf blade length: 300.0 mm–1100.0 mm. Style length: 1.0 mm–3.0 mm. ...
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Asteraceae Group 4: Dichotomous Key
...8–13 mm long; disk 5–10 mm wide; leaf blades linear (in part) 20b. Rays 1–2 mm long; disk 3–6 mm wide in flower; leaf blades narrow-lanceolate to ovate [Fig. 412] 21a. Invo...
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Pyrus communis (common pear)
...0.9-1.5 cm in diameter (vs. P. communis, flowers with 5 styles and a pubescent hypanthium, and pome mostly 4-12 cm in diameter).: Pyrus calleryana Family: Rosaceae ...
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Trisetum spicatum (narrow false oat)
...to 1 mm wide and lemma awn comprised of two distinct and dissimilar parts with a ring of cilia near the middle at the articulation point (vs. T. spicatum, with leaf blades 1-5 mm wide and lemma awns c...
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Pogonia ophioglossoides (rose pogonia)
... 14.0 mm–120.0 mm. Self-pollinating flowers: there are no cleistogamous flowers on this plant. Inflorescence ...