Squirrel-tail Grass. Hordeum jubatum L. Spikelets in clusters of three, central one only fertile, 5 mm. long, containing a grain adhering to the floral glume and palea, the other two abortive, seven awns in these three spikelets, 4–6 cm. long, four others less than 1 cm. long; awns and fragment of rachis holding the cluster of spikelets together, all barbed upward, making them troublesome for fleeces of sheep and the mouths of animals eating them. Native of this country and widely distributed.

Fig 17. [Old Witch Grass. Tickle Grass. A Tumble-Weed. Panicum capillare] L.

Old Witch Grass. Tickle Grass. A Tumble-Weed. Panicum capillare L. Florets flattened, elliptical, apex abruptly pointed, about 1.5 mm. long, highly polished, leaden gray, lighter at the extremities and along the edges of the glume, five slender light colored nerves join the extremities passing vertically over the glume, two light nerves on the palea. Native to this country.

Fig 18. [Tall Smooth Panicum. Switch Grass. Panicum virgatum] L.

Tall Smooth Panicum. Switch Grass. Panicum virgatum L. Achene surrounded by two persistent shining pieces, the floret; floral glume hard, light brown, oval or ovate-lanceolate 2.5–3.1 mm. long. Apex obtusely pointed. Seldom troublesome, widely distributed.