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Salix petiolaris (meadow willow)
...4-15 x 1-4 cm, with only white hairs, and branchlets brittle at the base and snapping cleanly at the junction of yearly growth (vs. S. petiolaris, with leaf blades 2.5-7 x 0.3-2, commonly with red-bro...
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Corema conradii (broom-crowberry)
...late 1700s. In New England, this creeping shrub with numerous, needle-like leaves is primarily confined to sandplains and open grasslands along the coast. Fires, which are common in these habitats b...
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Barbarea stricta (upright yellow-rocket)
...31-40 mm long, and pedicels 3-7 mm long in fruit (vs. B. stricta, with petals mostly 0.5-1 mm wide, siliques mostly 18-28 mm long, and pedicels mostly 1-3 mm long in fruit).: Barbarea orth...
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Section Acrocystis: Dichotomous Key
... 11a. Perigynium 3.1–4.7 mm long, with a beak 0.9–2 mm long; leaf blades coriaceous or herbaceous 11b. Perigynium 2.2–3.2 mm long, with a beak 0.4–1 mm long [Fig. 69]; leaf blade...
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Asteraceae Group 5: Dichotomous Key
... 11a. Capitulescence not at all flat-topped, resembling a panicle or thyrse or consisting of axillary clusters of capitula [Figs. 452, 458] (in part) 11b. Capitulescence or its ...
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Corydalis aurea (golden corydalis)
...spur 1-1.5 mm long (vs. C. aurea, with corolla bright yellow, 12–16 mm long, and spur 4-5 mm long).: Corydalis flavula Synonyms: Capnoide...
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Avenula pubescens (downy alpine oat grass)
...7-11 mm long and ligules of upper stem leaves 1-3 mm long (vs. A. pubescens, with spikelets 10-26 mm long and ligules of upper stem leaves 5-8 mm long).: Arrhenatherum elatius ...
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Camelina microcarpa (small-seeded false flax)
...mostly 10-25 mm long (vs. C. microcarpa, with the plants pubescent with simple hairs 1-2.5 mm long that exceed the length of the branched hairs, silicle body mostly 3.5-5 x 2-4 mm, and fruiting pedice...
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Fumaria officinalis (common fumitory)
... 1.0 None–1.0 None. Flower symmetry: there is no way to evenly divide the flower (the flower is asymmetrical). ...
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Sagittaria engelmanniana (Engelmann's arrowhead)
...(1809-1884), a German botanist and physician, who settled in Missouri and described hundreds of North American plants. Habitat: bogs, lacustrine (in lakes or ponds), marshes, shores of rivers or lak...