|
Bidens frondosa, an
annual herb originating in North America, occurs in damp wastelands
or roadsides in various districts. Dark purple stems with four
ridges grow to 0.5-1.5cm in height. Leaves with long petioles have
opposite phyllotaxis; those on 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 lanceolate,
with tips pointed and margins with serrations. Flower heads are
yellow and set themselves 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
