Page 51: 3,316 results for 2
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Glyceria: Dichotomous Key
... 2a. Spikelets 20–40 mm long; lemmas 7–8.5 mm long, acute at the apex [Fig. 231]; paleas exceeding lemmas by 1.5–3 mm 2b. Spikelets 10–20 mm long; lemmas 3.1–7 mm long, truncate t...
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Asclepias: Dichotomous Key
... 2a. Corona with hoods only, the horn lacking [Fig. 365]; umbels sessile or on peduncles up to 1 (–2) cm long 2b. Corona with horns within the hoods [Figs. 362, 363]; umbels borne...
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Orchidaceae: Dichotomous Key
... 21a. Plants with 2 leaves, in a pair near the base of the stem; labellum 4–12 mm long; capsules 9–13 mm long 21b. Plants with a single leaf (rarely 2 and then not paired), borne...
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Poa: Dichotomous Key
...[Fig. 259]; only 3 veins of the lemma prominent, the intermediate 2 veins inconspicuous 5b. Stems terete to slightly compressed, with 2–4 leaves; panicle branches 2–5 per node [Fig. 262]...
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Lespedeza: Dichotomous Key
...combined 2–5 times as long as the subtending leaf [Fig. 642]; keel petal 1–2 mm longer than the wing petals; calyx ca. 20% (rarely as much as 25%) as long as the legume 7b. Chasmogamous ...
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Carex Group 6: Dichotomous Key
... 2a. Perigynia (6.5–) 7–12 mm long, with a beak 2.1–4 mm long that is terminated by 2 teeth (1.2–) 1.5–3 mm long; style persistent at summit of achene (in part) 2b. Perigynia 2–5 ...
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Eragrostis: Dichotomous Key
... 2a. Leaf blades with elevated glands or glandular pits along the margin [Fig. 225] 3a. Lemmas 1.5–2 mm long, lacking glandular pits along the keel (rarely with 1 or 2 obscure gla...
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Elymus: Dichotomous Key
...0.1–0.2 mm wide 1b. Spikelets appressed to spreading-ascending; glumes present, with (1–) 2–7 veins, 6–40 mm long including the awn and 0.2–2.3 mm wide [Figs. 221, 223, 224] ...
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Medicago: Dichotomous Key
...(1–) 2–50 flowers; legume 1–10 mm long, armed with thin prickles or unarmed, curved to coiled up to 7 times (rarely straight in M. falcata and M. lupulina) 2a. Corollas 6–12...
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Pinus: Dichotomous Key
...8–20 cm long; umbo terminal 1b. Leaves in fascicles of 2 or 3, with 2 fibrovascular bundles in cross-section; bud scales fringed on the margin; seed cones 3–10 cm long; umbo dorsal ...