[Beggar Ticks with Discoid Flower Heads: The Genus Bidens in the Columbia River Gorge of Oregon and Washington]
Big Devils Beggartics, Tall Beggarticks, Western Sticktight
Bidens vulgata
The photo above shows a close-up view of the flower head of tall beggar ticks as seen at Gillette Lake, western Columbia River Gorge.......September 12, 2007. Note the lack of ray flowers and the fairly broad head.
The photo above shows a close-up side view of the involucre of tall beggar ticks as seen at Gillette Lake, western Columbia River Gorge.........September 12, 2007. This species tends to have 10-15 outer involucral bracts with the disk flowers a pale yellow, while leafy beggar ticks (Bidens frondosa) has 5-8 outer bracts and the disk flowers are orange.
A close-up of the compound leaf of tall beggar ticks as seen at Gillette Lake in the western Columbia River Gorge.........September 12, 2007. The leaves of this species are distinctly compound with 3-5 leaflets, the terminal leaflet generally with a petiole that is not winged.
The photo above shows tall beggar ticks as seen from along the shores of Gillette Lake, western Columbia River Gorge ............September 12, 2007. The division of the leaves into individual leaflets should be apparent in this view.
Paul Slichter