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Trillium: Dichotomous Key
...(1997). 1a. Leaf blades usually mottled; flowers sessile; petals erect or arching inward 1b. Leaf blades not mottled; flowers borne on a peduncle 1–10 cm long; petals eith...
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Festuca: Dichotomous Key
...with 1 rib 4b. Lemmas with awns 0.5–2.5 mm long; leaf blades of vegetative shoots with 1–7 ribs (the ribs often obscure in F. ovina) 5a. Anthers (0.5–) 0.7–1.1 (–1.3) ...
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Alopecurus: Dichotomous Key
...[Fig. 185]; anthers 2.2–3.5 mm long 2a. Glumes connate at the base for up to 25% of their length, ciliate on the keel with long hairs [Fig. 185], the hairs on the apical half of the keel ...
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Aristida: Dichotomous Key
...8–15 mm tall [Fig. 191]; callus of lemma 3–4 mm long 1b. Lemma awns not twisted together into a column (though they may be coiled at the base independent of one another) [Figs. 189, 190];...
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Sporobolus: Dichotomous Key
...(1.1–) 1.8–2.7 mm long 2b. Lemmas glabrous; spikelets 1.6–3 mm long; first glume 1.5–2.4 mm long; caryopsis 1.2–1.8 mm long 1b. Plants perennial, often with hard, knotty stem...
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Taraxacum: Dichotomous Key
...calyculus 12–16 mm tall 2b. Outer involucral bracts becoming reflexed [Fig. 471]; plants (1–) 5–75 cm tall; involucres excluding the outer calyculus (13–) 14–25 mm tall 3a. C...
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Lactuca: Dichotomous Key
...Involucre 10–15 mm tall in fruit; cypsela body 4.5–6 mm long including the beak; pappus 5–7 mm long 4b. Involucre 15–22 mm tall in fruit; cypsela body 7–10 mm long including the beak; pap...
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Crocanthemum: Dichotomous Key
...(1965). 1a. Chasmogamous (i.e., petaliferous) flowers solitary (rarely paired) at the summit of the stem during anthesis, later overtopped by lateral branches [Fig. 584]; capsules of c...
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Lythrum: Dichotomous Key
...(1975). 1a. Inflorescence an elongate thyrse borne at the summit of the stem and branches, the primary one mostly 10–40 cm tall; flowers with 12 stamens, trimorphic; petals 7–12 mm lon...
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Euphrasia: Dichotomous Key
...(1970). 1a. Bracts with subulate or bristle-tipped teeth [Figs. 751, 752]; corolla 5–8 mm long 2a. Bracts erect to ascending, cuneate at the base, with ascending teeth [Fi...