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Cyperaceae: Dichotomous Key
...[Figs. 122, 123, 124] 14b. Achenes without tubercles or with small, relatively inconspicuous style bases [Figs. 66, 121] 15a. Perianth dimorphic––an outer set of 3 retrorse-b...
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Melanthiaceae: Dichotomous Key
... 1a. Sepals and petals clearly different, the sepals green; leaves borne in a single whorl at the summit of the stem, pinnately veined [Fig. 159]; fruit a berry 1b. Sepals and pet...
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Section Lupulinae: Dichotomous Key
... 1b. Carpellate spikes ovoid to cylindric, 1.5–8 cm long; lowermost bract of inflorescence with a closed sheath 5–150 mm long; achenes rhomboid; beak of perigynium 6–10 mm long 3a...
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Najas: Dichotomous Key
... 1a. Each margin of the leaf blade with 7–17 spinules [Fig. 131], these either minute and unicellular or larger and multicellular; apex of leaf sheath truncate or auriculate [Fig. 131] ...
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Lilium: Dichotomous Key
...[Fig. 157]; inflorescence with 1–3 flowers 2b. Flowers nodding; tepals gradually narrowed in the basal portion; inflorescence with (1–) 2–22 flowers 3a. Style similar in col...
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Poaceae Group 7: Dichotomous Key
... 14a. Spikelets 10–15 mm long; plants growing on sandy beaches of the Atlantic coast and Lake Champlain 14b. Spikelets 1–9 (–10) mm long; plants growing in a wide variety of habit...
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Poaceae Group 8: Dichotomous Key
... 1a. Lemmas 3- or 5-lobed at the apex, with 3 awns; ligules 0.1–0.5 mm long (in part) 1b. Lemmas entire or bilobed at the apex, awnless or with a single awn; ligules 0.5–16 mm l...
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Chloris: Dichotomous Key
...perennial, 10–15 (–30) dm tall, usually producing stolons 1b. Second lemma of spikelet ± truncate at the apex, sometimes widened distally; plants annual or perennial, 1.4–6 (–10) dm tall,...
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Zizania: Dichotomous Key
...inflorescence 1–8 (–15) cm wide, the branches bearing mature carpellate spikelets appressed (rarely some ascending); leaf blades 3–15 (–20) mm wide; ligules 3–8 (–16) mm long 1b. Fertile ...
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Echinochloa: Dichotomous Key
... 1a. Panicle branches 0.7–2 (–4) cm long, few, distant, simple; leaf blades 3–6 (–10) mm wide; spikelets 2–3 mm long 1b. Panicle branches (1–) 2–10 cm long, variable in number but...