The Manual of the Botany of the Northern United States / Including the District East of the Mississippi and North of North Carolina and Tennessee

by Asa Gray

STIPA.—Empty glumes and flower (a little separated) of S. avenacea, enlarged.

ARISTIDA.—A spikelet of A. purpurascens, enlarged.

EXPLANATION OF PLATE IX.

SPARTINA.—(1) Portion of the inflorescence of S. stricta, of the natural size; (2) a spikelet enlarged; and (3) the same displaced, the flower raised above the empty glumes.

CTENIUM.—(1) Spike of C. Americanum; (2) a single spikelet magnified; and (3) the same displayed, the empty glumes separated.

BOUTELOUA.—(1) A portion of the compound spike of B. racemosa, of the natural size; and (2) a spikelet displayed and magnified, the flowers raised out of the empty glumes.

GYMNOPOGON.—(1) Inflorescence of G. racemosus, reduced in size; and (2) a magnified spikelet with the parts displayed.

CYNODON.—(1) Inflorescence of C. Dactylon, of digitate spikes; (2) a spikelet magnified and displayed, showing a perfect flower and a rudiment.