GENERA OF GRASSES OF THE UNITED STATES. 
79 
Fig. ZG.—Triplasis purpurea. Plant, X I ; spikelet, floret (above) showing beard on the 
nerves of the palea and cleistogene (at left), a cleistogamous fertile 1-flowered spikelet 
from the axil of a lower leaf, all X 5. 
