What’s a dichotomous key?
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- Group 1Lycophytes, Monilophytes
- Group 2Gymnosperms
- Group 3Monocots
- Group 4Woody angiosperms with opposite or whorled leaves
- Group 5Woody angiosperms with alternate leaves
- Group 6Herbaceous angiosperms with inferior ovaries
- Group 7Herbaceous angiosperms with superior ovaries and zygomorphic flowers
- Group 8Herbaceous angiosperms with superior ovaries, actinomorphic flowers, and 2 or more distinct carpels
- Group 9Herbaceous angiosperms with superior ovaries, actinomorphic flowers, connate petals, and a solitary carpel or 2 or more connate carpels
- Group 10Herbaceous angiosperms with superior ovaries, actinomorphic flowers, distinct petals or the petals lacking, and 2 or more connate carpels
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- Dichotomous Key
- Cyperaceae
- Carex
- Carex Group 4
Carex Group 4
See list of 31 species in this group-
1a. Perigynia pubescent, with an evident, bidentate beak ca. 1 mm long
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1b. Perigynia glabrous (though minutely papillose in several species), beakless or with a short, ± entire beak 0.1–0.4 mm long (with an obscurely bidentate beak 0.2–0.8 mm long in Carex saxatilis)
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2a. Perigynia white or gold-orange, biconvex in cross-section; lowest bract of carpellate spikes with a prolonged, closed sheath usually longer than 4 mm
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2b. Perigynia green to brown to black, planoconvex to biconvex in cross-section; lowest bract of carpellate spikes lacking a sheath or the sheath shorter than 3 mm
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3a. Style deciduous from achene in fruit; leaf sheaths with no, or very few, septate partitions; perigynia often minutely papillose, with a short, inconspicuous beak 0.1–0.4 mm long
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3b. Style persistent on achene in fruit; leaf sheaths with septate partitions; perigynia smooth, with a distinct beak 0.2–0.8 mm long (in part)
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Show photos of: Each photo represents one species in this subgroup.