Yellow or Orange Flowers
Daisy-like Flowers )
Composite Family (Compositae)
Habitat: Montane to Subalpine Moist Coniferous Woods
Height: Up to 60 cm
Description: This very common arnica is found throughout the study area. There are several large, heart-shaped basal leaves on long leaf-stalks. The stem supports several opposite pairs of smaller, heart-shaped leaves. The yellow, daisy-like flower head has both disk and ray florets. In composite flowers, each petal, and each centre spot, are connected to a fully independent flower. The flower is up to 7.5 cm across. The ends of the petals have narrow teeth. There are 15 species of arnica in Alberta alone, so it can be very difficult, even for a botanist, to definitively identify every species.
A similar species, the broad-leaved arnica (A. latifolia) is the most common western slope arnica. It looks much like the heart-leaf arnica, but the leaves lack a distinct leaf-stalk. The stem leaves are clasping, and the basal leaves have short stalks.
At higher elevations, the alpine arnica (A. alpina) can be distinguished from its more common relative, heart-leaved arnica (A. cordifolia), by its linear leaves. The flower is typically arnica with a yellow disk surrounded by yellow petal-like ray florets. The end of each petal shows three shallow notches. The stem is woolly.
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