Inula helenium |
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elecampane, elecampane inula, horse yellowhead, inula |
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Habit | Plants 50–100(–200) cm. |
Leaves | basal blades ± elliptic, mostly 15–40 cm × 100–200+ mm (bases decurrent onto strongly ribbed petioles, margins callose-denticulate, otherwise entire, abaxial faces velvety-woolly, adaxial thinly hairy); cauline blades ovate or elliptic to lanceolate, 10–30 cm × 45–120 mm, bases cordate, clasping, margins serrate. |
Involucres | (20–)30–40 mm diam. |
Ray florets | (15–)50–100+; corolla laminae (10–)20–30+ mm. |
Disc corollas | 9–11 mm. |
Outer phyllaries | ovate, oblong, or ± deltate to lanceolate, 12–20(–25+) × 6–8(–20+) mm (abaxially velvety-hairy); inner phyllaries progressively narrower, less hairy, more scarious. |
Cypselae | 3–4 mm, glabrous; pappi of (40–)50–60 basally connate, barbellate bristles or setiform scales 6–10 mm. |
2n | = 20. |
Inula helenium |
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Phenology | Flowering mid–late summer. |
Habitat | Roadsides, waste places, streamsides |
Elevation | 0–300(–600+) m (0–1000(–2000+) ft) |
Distribution |
CA; CT; DE; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; NC; NH; NJ; NY; OH; OR; PA; RI; TN; UT; VA; VT; WA; WI; BC; MB; NB; NS; ON; PE; QC; Europe [Introduced in North America; introduced, Asia and beyond]
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Discussion | Inula helenium is widespread in the Old World. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 474. |
Parent taxa | Asteraceae > tribe Inuleae > Inula |
Sibling taxa | |
Name authority | Linnaeus: Sp. Pl. 2: 881. (1753) |
Web links |
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