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Rubus pensilvanicus (Pennsylvania blackberry)
...9-22 flowers (vs. R. pensilvanicus, with the axis of inflorescence lacking stipitate glands and inflorescence with usually 7-12 flowers).: Rubus allegheniensis prickle...
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Celastrus scandens (American bittersweet)
...with 2 or 3 flowers, leaf blades usually less than 2 times as long as wide, and capsules usually with 5 or more seeds (vs. C. scandens, with flowers in a terminal array of 6 or more flowers, leaf blad...
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Quercus velutina (black oak)
...oak's specific epithet (velutina) derives from the Latin word for fleece, which refers to the leaves that are downy when young. This tree produces reliable acorn crops every 2-3 years, which are ...
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Reseda lutea (yellow upright mignonette)
...with 2 or 3 lobes (vs. R. lutea, with petals apically entire or with 2 or 3 linear-spathulate segments, capsules 4.5–5.5 mm wide, seeds lustrous, smooth, and most leaf blades pinnatifid with 1 or 2 pa...
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Veronica austriaca (broad-leaved speedwell)
...1–2 times as long as wide, style 3–5 mm long, and sepals subequal in length (vs. V. austriaca, with leaf blades lanceolate to ovate, 2–4 times as long as wide, style 6–8 mm long, and upper sepals much...
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Calamagrostis stricta (neglected reed grass)
...mostly 20-80 mm wide, lemma with dense callus pubescence mostly 90-120% as long as the lemma, and lemma awn smooth, at least in the basal half (vs. C. stricta, with panicle contracted and dense, mostl...
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Rosa gallica (French rose)
...or 2-flowered inflorescences with ebracteate pedicels that bear abundant stipitate-glands and have abundant prickles of various sizes on the branchlets. The other morphology has 2- to 4-flowered inflo...
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Spartina pectinata (prairie cordgrass)
...to 2 mm long, the lateral veins usually hispid, and lower glume 1/2 to 2/3 as long as adjacent lemma (vs. S. pectinate, with upper glumes with awns 3–8 mm long, the lateral veins usually glabrous, and...
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Polygonatum biflorum (King Solomon's-seal)
...peduncles 2- to 10-flowered, tepals 17–20 mm long) compared with the diploid (rhizomes 6–15 mm thick, stems 1.5–5 mm thick at the lowest leaves, peduncles 2- or 3 (–5)-flowered, tepals 10–17 mm long),...
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Ceratophyllum demersum (common hornwort, coontail)
...with 2 basal spines and 2-13 lateral spines (vs. C. demersum, with leaves mostly 1-time or 2-times forked and achenes with only 2 basal spines).: Ceratophyllum echinatum ...