Herbs, perennial, (45-)60-160 cm tall, sparsely pubescent. Lowermost leaves shortly petiolate; leaf blade 2-pinnatisect. Middle stem leaves ± sessile; leaf blade elliptic, ovate-elliptic, suborbicular, or ovate-orbicular, 3-10(-15) × 1.5-6(-10) cm, abaxially densely gray arachnoid tomentose, adaxially sparsely arachnoid puberulent or glabrescent, 1- or 2-pinnatisect or pinnatipartite; segments (3 or)4 or 5, elliptic-lanceolate or linear-lanceolate, 3-5 × 1-1.5 cm, rachis narrowly winged, few serrate or not. Uppermost leaves pinnatipartite; leaflike bracts 3-lobed or entire; lobes or entire bracts lanceolate. Synflorescence an ill-defined panicle, lateral branches often shorter than subtending leaves. Involucre oblong, 2.5-3(-3.5) mm; phyllaries densely arachnoid pubescent. Marginal female florets 7-10. Disk florets 8-20, bisexual. Achenes obovoid or ovoid. Fl. and fr. Aug-Oct. 2n = 16, 16 + 1b, 18, 24, 36, 40, 45, 54.
Perennials, (40–)60–190 cm, sometimes faintly aromatic (rhizomes coarse). Stems relatively numerous, erect, brownish to reddish brown, simple proximally, branched distally (angularly ribbed), sparsely hairy or glabrous. Leaves basal (petiolate) and cauline (sessile), uniformly green or bicolor; blades broadly lanceolate, ovate, or linear, (2–)3–10(–12) × 1.8–8 cm (proximal reduced and entire, distal pinnately dissected, lobes to 20 mm wide), faces pubescent or glabrescent (abaxial) or glabrous (adaxial). Heads in compact, paniculiform or racemiform arrays (10–)20–30(–40) × (5–)7–15(–20) cm. Involucres ovoid to campanulate, 2–3(–4) mm. Phyllaries lanceolate, hairy or glabrescent. Florets: pistillate 7–10; bisexual (5–)8–20; corollas yellowish to reddish brown, 1.5–3 mm, glabrous (style branches arched-curved, truncate, ciliate). Cypselae ellipsoid, 0.5–1(–1.2) mm, glabrous, sometimes resinous. 2n = 18, 36, 40, 54.
"Rhizomatous perennial 0.5–2 m, simple or branched above, the stem glabrous or nearly so below the infl; lvs green and glabrous or nearly so above, densely white- tomentose beneath, chiefly obovate or ovate in outline, 5–10 × 3–7 cm, the principal ones cleft nearly to the midrib into ascending, acute, unequal segments that are again toothed or cleft, and ordinarily with 1 or 2 pairs of stipule-like lobes at base; infl generally ample and leafy; invol 3.5–4.5 mm; disk-cors 2.0–2.8 mm; achenes ellipsoid, not nerved or angled; 2n=16. Fields, roadsides, and waste places; native of Eurasia, now established throughout most of e. U.S. and adj. Can. July–Oct."
A perennial, large, basally suffruticose shrub with several, closely growing, erect, simple cinereous or tomentose to glabrous, striate to shallowly grooved, reddish-tinged, (30-) 50-18 (-200) cm tall stems from the upright, 1.5-2 cm thick rootstock. Leaves densely whitish arachnoid hairy beneath, green and sparsely hairy to glabrous above, basally articulate; basal leaves petiolate, lamina broadly ovate, 5-12 (-15) x 3-6 (-8) cm, unipinnatisect into elliptic-ovate, pinnatifid primary segments with acute lobes; middle and upper stem leaves sessile to subsessile, deeply pinnate; uppermost in floral region undivided, lanceolate, entire, acute. Capitula heterogamous, numerous, subsessile, oblong, 3-4 x c. 2 mm, erect to ± nodding, in 10-40 x 5-25 cm, broadly pyramidate panicle with 5-20 cm long, upwardly directed primary and secondary branches. Involucre 4-seriate, phyllaries greyish arachnoid pubescent outside; outermost ovate, 1.5 x c. 1 mm, narrowly scarious on margins, acute; inner elliptic-oblong, c. 2 x 1.75 mm, broadly pale scarious margined, obtuse. Receptacle glabrous, hemispherical. Florets 10-30, yellow with reddish tinge; marginal florets 5-10, female, fertile, with 1.75-2 mm long, bidentate, glandulose corolla tube; disc florets 5-20, bisexual, fertile, with 1.5-2 mm long, narrowly tubular-campanulate 5-toothed glandulose corolla. Cypselas light brown, c. 1 mm long, finely striate.
50–150 cm hoch, schwach aromatisch, ohne oder mit nur kurzen Ausläufern. Blätter 1–2fach fiederschnittig, Abschnitte breit- bis schmal-lanzettlich, spitz und gezähnt, am Grund mit stängelumfassenden Zipfeln, oberseits grün, unterseits weissfilzi
|Assenzio selvatico, Amarella||Italian||CH|