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Krigia: Dichotomous Key
...Group 1 > Krigia. Krigia. 1a. Pappus of 10 inconspicuous, hyaline scales and 20–35 longer, slender bristles; involucre 7–14 mm tall; basal leaf blades 10–50 ...
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Iva: Dichotomous Key
... 1a. Leaf blades glabrous; axis of capitulescence glabrous; petioles 3–10 mm long; peduncles 1–3 mm long; plants suffrutescent perennials of coastal marshes and shores 1b. Leaf bl...
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Tanacetum: Dichotomous Key
...5–10 mm wide; capitulescence with (10–) 20–70 (–100) capitula; rays absent 2b. Leaf blades villous; disk 10–18 mm wide; capitulescence with 1–15 (–30) capitula [Fig. 470]; rays present,...
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Echinacea: Dichotomous Key
... 1a. Lower leaf blades broad-lanceolate to elliptic or broad-ovate, (1–) 5–12 cm wide, mostly 1.5–5 times as long as wide, usually toothed, abruptly tapered to the petiole; plants from fribrou...
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Ratibida: Dichotomous Key
...(1968). 1a. Disk ellipsoid to spherical, 10–25 ×10–18 mm; plants from fibrous roots; pappus usually absent (rarely consisting of 1 or 2 tooth-like scales); style branches stigma...
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Bistorta: Dichotomous Key
...2–10 cm long, narrowed at the base; plants native, of alpine habitats, at elevations exceeding 1000 m 1b. Inflorescence 5–9 ×1–2 cm, bearing only fertile flowers; leaf blades 6–20 ...
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Sanguisorba: Dichotomous Key
... 1a. Leaflets 5–20 mm long; flowers with 12 or more stamens and 2 carpels 1b. Leaflets mostly 25–80 (–100) mm long; flowers with 4 stamens and 1 carpel 2a. Sepals whi...
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Eriophorum: Dichotomous Key
... 1a. Spikelets solitary, erect, with 10–15 sterile scales in the basal portion, not subtended by foliaceous involucral bracts [Fig. 120]; plants cespitose 1b. Spikelets 2–many, sp...
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Amaranthus: Dichotomous Key
... 11a. Fruits rugose when dry; terminal panicle mostly 10–20 cm tall; stems erect, 2–10 dm tall; fruit 1–1.6 mm long; seed orbicular in outline 11b. Fruits smooth to slightly wrink...
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Potamogeton: Dichotomous Key
...blades 1- to 13-veined; spikes with 1–5 whorls of flowers; drupes 1.5–3.5 mm long 10a. Nodal glands absent (very rarely present); spikes 1.5–7 mm long, with 1 or 2 whorls of flowers [Fig....