UNIOLA.—(1) A spikelet of U. latifolia, of about the natural size; (2) a flower, enlarged; (3) empty flowering glume of the lowest (sterile) flower.
PHRAGMITES—(1) A spikelet of P. communis, enlarged; (2) one of the perfect flowers, enlarged; and (3) the lowest flower, which has stamens only.
ARUNDINARIA.—(1) A spikelet of A. macrosperma; and (2) a separate flower, magnified.
SCHEDONNARDUS.—(1) Portion of the spike of S. Texanus, enlarged; and (2) a flower, magnified.
LOLIUM.—(1) Portion of the spike of L. temulentum; and (2) a separate flower, magnified.
AGROPYRUM.—(1) Portion of the spike of A. repens, or Couch-Grass, of about the natural size; (2) a flower, magnified.
HORDEUM.—(1) The three one flowered spikelets from one joint of the spike of H. jubatum, with their awn-like empty glumes, the lateral flowers abortive and neutral, the middle one alone perfect; (2) this perfect flower (with an awn-like rudiment) open and enlarged.
ELYMUS.—(1) The two spikelets of one joint of the spike of E. Virginicus, about the natural size; (2) the empty glumes and the flowers of one spikelet, enlarged and displayed; and (3) an open flower, more magnified.