Bidens means two teeth, and refers to the two sharp prongs of the flat, brown seed of this species, which attaches itself to everything in the line of clothing or wool that happens to brush against it. They will not shake off, either, and their removal requires the most patient and exacting effort, as anyone who has roamed the fields in the fall can testify. The tall, annual, erect, very leafy stalk grows from two to nine or ten feet high, and branches in pairs. It is usually smooth and hollow, and often stained with purple. The thin, sharply toothed, slender-stemmed leaves are divided into three or five lance-shaped parts which are tapered toward the apex and narrowed at the base. They are set on short, ribbed stems, that unite with the stalk in pairs with a noticeable clasping joint, from the axils of which spring the curving flower stems. The very small, ragged, rayless, bristling flower heads are homely and unattractive. The two or three dull yellow ray flowers are very inconspicuous, if any, and. the brownish yellow tubular florets of the central head are tightly packed together. The head is surrounded with several narrow leafy bracts of various lengths, and several heads are clustered in a loose terminal group. Beggar-ticks are exceedingly common, and aside from their affectionate stickers, they are an uninteresting plant. They are found everywhere in moist places, and along roadsides and railroad ditches, from July to October, and range from Nova Scotia to Florida. British Columbia, Nebraska, and Texas.