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Carex Group 4: Dichotomous Key
... 1a. Perigynia pubescent, with an evident, bidentate beak ca. 1 mm long 1b. Perigynia glabrous (though minutely papillose in several species), beakless or with a short, ± entire b...
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Section Porocystis: Dichotomous Key
...(5–) 11–20 mm long, densely flowered throughout; anthers 0.7–1.3 (–1.6) mm long 3b. Uppermost spike 20–35 (–40) mm long, loosely flowered near base; anthers (1–) 1.6–2 (–2.8) mm long ...
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Cypripedium: Dichotomous Key
... 1b. Plants with 2–9 leaves alternately arranged on the stem; labellum with a round opening near the base on the adaxial surface 2a. Labellum 1–1.6 (–2.5) cm long, strongly red-ve...
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Neottia: Dichotomous Key
... 1a. Labellum divided ½ or more of its length into 2 pointed, linear segments [Fig. 171]; column 0.5–1 mm tall; floral bracts about 0.7–2.0 mm long; pedunce usually longer than the leav...
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Malaxis: Dichotomous Key
... 1b. Labellum with 2 lobes at the apex and with a shorter, central tooth in the sinus between the lobes [Figs. 168, 169]; pedicels (3.4–) 5–10 (–13) mm long; bracts 0.2–1.6 mm long; infloresce...
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Poaceae Group 6: Dichotomous Key
... 1a. Spikelets nearly circular in outline; glumes obovate, cross-wrinkled, the tips crossing (in part) 1b. Spikelets not at all circular in outline; glumes linear to lanceolate,...
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Phragmites: Dichotomous Key
... 1b. Ligules 1–1.7 mm long; lower glumes 3–6.5 mm long; upper glumes 5.5–11 mm long; lemmas 8–13.5 mm long; middle and upper internodes of stem smooth and highly lustrous, red-brown to dark re...
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Bouteloua: Dichotomous Key
... 1a. Branches of panicle each with 20–130 spikelets [Fig. 193], persistent, the branch axis terminated by progressively reduced spikelets, not prolonged beyond spikelets; disarticulation above...
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Lolium: Dichotomous Key
... 1a. Glume (5.5–) 7–28 mm long, the body 0.75–1.5 times as tall as the column of florets; plants annual, with 2- to 10-flowered spikelets 1b. Glume 3.5–15 mm long, the body 0.25–0...
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Centaurea: Dichotomous Key
...(1992) was based on a specimen of C. nigra (Fernald 1922a). Reference: Keil and Ochsmann (2006). 1a. Involucral bracts tipped by 1 or more spines [Fig. 387]; disk corollas yello...