Fig 186. [Purple-stemmed Swamp Beggar-ticks. Bidens connata] Muhl.
![[Purple-stemmed Swamp Beggar-ticks. Bidens connata]](#1525880611323293367_fig-186.jpg.id-633741921678081653.wrap-0.html.html){kind=link}
Purple-stemmed Swamp Beggar-ticks. Bidens connata Muhl. Flowers orange; achenes brown, wedge-shaped or obovate, hairy, tubercled, flattened, 4-angled, 4-toothed, 4–6 mm. long, achenes and teeth downwardly barbed. Swamps, common.
Fig 187. [Beggar-ticks. Bidens frondosa] L.
![[Beggar-ticks. Bidens frondosa]](#1525880611323293367_fig-187.jpg.id-3152154720790829313.wrap-0.html.html){kind=link}
Beggar-ticks. Bidens frondosa L. Achenes dull brown, tubercled, much flattened, obovate or oval, 6–12 mm. long, awns usually 2, spreading barbed downward. Low lands.
Fig 188. [Star Thistle. Centaurea solstitialis] L.
![[Star Thistle. Centaurea solstitialis]](#1525880611323293367_fig-188.jpg.id-7845011208722425590.wrap-0.html.html){kind=link}
Star Thistle. Centaurea solstitialis L. Achene cream white to mottled brown, flattened, oval about 2 mm. long; scar of attachment in a notch of one edge above the rounded base, apex truncate with a small tubercle in the middle. Found in seeds of alfalfa. A ragged plant from Europe.