finger-grass

from The Century Dictionary.

• noun The common crab-grass, Panicum sanguinale.
• noun Syntherisma serotina, a native American grass with shorter, broader, and more hairy leaves than the common finger-grass: found from Delaware to Florida and westward to Mississippi. Other species, as, S. filiformis and S. villosa, are also called finger-grass.
• noun Any species of the genus Chloris, which consists of handsome and sometimes useful grasses with radiating spikes like those of the crab-grass and crowfoot-grass, rendered specially attractive by the long awns of the flowers.