Inula britannica

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Taxonomy
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Order: Asterales
Family: Asteraceae
Genus: Inula
Species: I. britannica
Scientific Name
Inula britannica
L.
Common Names

British yellowhead, British elecampane, Meadow fleabane

Overview

Appearance
Inula britannica is an erect herbaceous plant that grows from 6-30 in. (15-75 cm) tall. The stems may be densely covered with appressed (pressed close against the stem) hairs or it may be almost hairless. It can be biennial or perennial. I. britannica is native to temperate and tropical Asia and Europe.
Foliage
The lanceolate to elliptical leaves are sessile and may become clasping towards the top of the plant. The adaxial leaf surface is sparsely pubescent while the abaxial surface is densely pubescent surface. The leaf margins may be smooth or finely toothed.
Flowers
Both ray and disk flowers of I. britannica are yellow. Flowers can occur alone or in clusters of two or three. The flower heads range from 0.8-1 in. (2-5 cm) across. Rays are long and narrow. Two linear rows of soft green bracts are much shorter than the rays.
Fruit
Fruits of I. britannica are achenes. The white pappus has 20-25 distinct bristles.
Ecological Threat
Inula britannica has been reported in eastern Canada and the northeastern United States. It can reproduce by seed, short rhizomes, and root fragments. The USDA gave it a high rating as very likely or certain to be introduced to new areas.

References

An Aggressive Weed Alert. 2002. Alabama Cooperative Extension System. Alabama A&M University and Auburn University [1]
Weed Risk Assessment. Revised 2009. USDA, PPQ, APHIS. [2]
Flora of China, www.eFloras.org. [3]
USDA NRCS PLANTS. [4]
USDA ARS GRIN. [5]
EDDMapS.org. [6]


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