Bidens amplectens - image Bidens pilosa - image Bidens alba - Romerillo. Bidens tripartita - Short description and medicinal uses. A Close-up View of Four Beggar-ticks - Photographic study by Brian Johnston of four species of Bidens with many fine images, both macroscopic and microscopic. Bidens alba - Two photographs of this species. Bidens pilosa: Picao Preto - Description and several photographs of this annual herb and information on its herbal properties, tribal and herbal medicine uses, the chemicals it contains, its biological activities and clinical research. Bidens frondosus - Images, specimen location map, list of habitats, and links to further information. Bidens mitis - Smallfruit Beggarticks. Bidens connata - Purplestem Beggarticks. Bidens coronata - Crowned Beggarticks. Bidens laevis - Smooth Beggartick. Bidens discoidea - Small Beggarticks. Bidens tripartita - Threelobe Beggarticks. Bidens cernua - Nodding Beggartick. Bidens frondosa - Devil's Beggartick. Bidens aristosa - Bearded Beggarticks.