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Bidens frondosa,
an annual herb native to North America, is found in damp wastelands
and along roadsides in various districts. Dark purple stems with
four ridges grow to a height of 0.5-1.5cm. Leaves with long petioles
have opposite phyllotaxis; the lower parts are biternate compounds,
and those on the upper ones are ternate compound leaves. The
leaflets all have petiolules, 3-13cm-long oval-like lanceolates,
with tips pointed and margins with serrations. Flower heads are
yellow and set singly on branch tips. Involucral bracts are 6-12 in
number and significantly large and conspicuous. Bloom time:
September-October. |
Wild plants in and around Shimane
島根とその周辺の野生植物
