Inula helenium

Linnaeus

Sp. Pl. 2: 881. 1753.

IntroducedIllustrated
Treatment appears in FNA Volume 19. Treatment on page 474.

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. 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. Ray-florets (15–) 50–100+; corolla laminae (10–) 20–30+ mm. Disc corollas 9–11 mm. Cypselae 3–4 mm, glabrous; pappi of (40–) 50–60 basally connate, barbellate bristles or setiform scales 6–10 mm. 2n = 20.


Phenology: Flowering mid–late summer.
Habitat: Roadsides, waste places, streamsides
Elevation: 0–300(–600+) m

Distribution

V19-794-distribution-map.gif

Introduced; B.C., Man., N.B., N.S., Ont., P.E.I., Que., Calif., Conn., Del., Ill., Ind., Iowa, Ky., Maine, Md., Mass., Mich., Minn., Mo., N.H., N.J., N.Y., N.C., Ohio, Oreg., Pa., R.I., Tenn., Utah, Vt., Va., Wash., Wis., Europe, Asia and beyond

Discussion

Inula helenium is widespread in the Old World.

Selected References

None.

Lower Taxa

None.
... more about "Inula helenium"
rounded;truncate +
scarious +
ovate +  and lanceovate or linear +
corymbiform +  and open +
indeterminate +  and determinate +
Neil A. Harriman +
Linnaeus +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
cordate +
compound +  and simple +
entire +, usually serrate +  and dentate +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
elliptic +  and lanceolate +
4.5 cm45 mm <br />0.045 m <br /> (12 cm120 mm <br />0.12 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
prismatic +  and columnar +
fertile +  and bisexual +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
B.C. +, Man. +, N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Calif. +, Conn. +, Del. +, Ill. +, Ind. +, Iowa +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, R.I. +, Tenn. +, Utah +, Vt. +, Va. +, Wash. +, Wis. +, Europe +  and Asia and beyond +
0–300(–600+) m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, waste places, streamsides +
in open , corymbiform arrays +  and singly +
indeterminate +
heterogamous +
each +  and sessile +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
campanulate;hemispheric +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
deltate +
2 cm20 mm <br />0.02 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
12mm +  and 20mm +
more or less deltate +  and lanceolate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
2-carpellate +
persistent +
Flowering mid–late summer. +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
alveolate +  and smooth +
convex;flat +
setiform +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
exalbuminous +
Introduced +  and Illustrated +
prostrate +  and ascending +
appendaged +  and truncate +
papillate +
Compositae +
Inula helenium +
species +
20 cm200 mm <br />0.2 m <br /> (200 cm2,000 mm <br />2 m <br />) +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
10 +, 9 +  and 8 +