Mentioned on page 7. Annuals or perennials, mostly 50–150+ cm (often rhizomatous). Leaves all or mostly cauline; opposite; petiolate; blades (pinnately
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opposite; usually sessile; blades mostly linear to elliptic, oblanceolate, oblong, or obovate, margins usually setose-ciliate (mostly near bases), faces glabrous
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175. Shrubs, 50–150 cm. Stems ascending to erect, much branched. Leaves mostly cauline; alternate or opposite; petiolate or sessile; blades usually 3-nerved
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on page 542, 603. Annuals or perennials (often with rank, pungent odor), mostly 20–200 cm (taprooted; glabrous or ± tomentose or villous, often unevenly
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spreading, branched from bases or throughout. Leaves mostly cauline; all or mostly opposite or all or mostly alternate; petiolate or sessile; blades usually
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[–250+] cm. Stems erect, branched from bases or throughout. Leaves cauline; mostly opposite (distal sometimes alternate); petiolate or sessile; blades (or
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Annuals, 5–120 cm (mostly self-incompatible). Stems erect to spreading (unbranched or branched). Leaves basal and cauline (at least basal mostly withering before
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page 178. Mentioned on page 176. Perennials, mostly 30–120 cm. Stems erect. Leaves basal and/or cauline; mostly opposite; petiolate, subpetiolate, or sessile
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glabrous, hirsute, or puberulent. Leaves mostly cauline; mostly alternate; petioles 1–7 cm; blades deltate-ovate, lanceovate, or ovate, 2.5–14 × 1.8–13 cm, bases
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opposite proximally, petiolate or distal bracteate ones subsessile, blade lanceovate, lanceolate, deltoid, or cordate, 5–75 × 4–50 (–75) mm, base subhastate
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Cauline leaves: (nearly all opposite or mostly alternate) largest proximal to mid-stems; blades ± 3-nerved, lanceovate or oblong-lanceolate to lanceolate or
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usually 1, erect or ascending, branched distally or ± throughout. Leaves mostly cauline; opposite; petiolate or sessile; blades usually 1–3-pinnately lobed
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[perennials], mostly 20–100 cm (taprooted; often glaucous). Stems usually 1, erect or lax (branched throughout or distally). Leaves mostly cauline; alternate;
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blades elliptic, lance-linear, lanceovate, linear, or ovate, 10–90 × 2–28 mm, margins ciliate to 1/4 their lengths, hairs mostly less than 0.5 mm, faces strigose
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pubescent; blades pinnately veined, lance-elliptic to lanceolate or lanceovate, mostly (6–) 8–23 (–30) × (1.5–) 2–7 (–9) cm, bases gradually or abruptly
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ascending], branched mostly from bases [± throughout], often tomentose to lanate, sometimes glabrate or glabrous [sericeous] (hairs mostly medifixed) and gland-dotted
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scarious (apices acute to acuminate or mucronate, minutely pubescent); outer lanceovate to narrowly lanceolate (glabrous or sparsely pubescent), inner narrowly
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erect, simple or branched, glabrous or hairy (hairs basifixed). Leaves mostly basal or basal and cauline; petiolate or sessile; blades obovate to lanceolate
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glanddotted, farinaceous to puberulent when young). Leaves cauline; all or mostly alternate (at flowering); petiolate or subsessile; blades obscurely nerved
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Stems 1, erect, branched dichotomously, divaricate (drying brittle). Leaves mostly cauline; opposite; obscurely petiolate; blades 1 (–2) -pedately or pinnately
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