300 TRIANDRIA MONOGYNIA. 



* * Without an involucrum. 



66. DIGITARIA. Spikes linear, unilateral, generally digitate 01 fo- 

 ciculate. Spikelets by pairs, on short bifid pedicels. Cal 1 2- 

 valved, 2-flowcred; inferior glume often inconspicuous. Inferior 

 Jioret abortive, 1-valved, herbaceous. Superior floret perfect ; valves 

 coriaceous. 



67. ANDROPOGON. Spikelets by pairs, polygamous; the inferior 

 one abortive, (antheriferous or neuter,) on a bearded pedicel ; glum. 

 and cor. frequently very minute or wanting. Superior spikelet ses- 

 sile, 1 -flowered, perfect ; glumes subcoriaceous ; cor. '<;-valved, shorter 

 than the calyx, membranaceous ; the inferior valve generally awned. 



68. HORDEUM. Spikelets 3 at each joint of the rachis, 1-flowered, 

 all perfect, or the lateral ones abortive. Glum, lateral, subulate. 

 Perfect Jl. : Cor. 2-valved ; inferior valve terminating in a bristle, 

 Seed coated. 



TRIGYNIA. 



69. MOLLUGO. Cal. 5-leaved, colored within. Cor. 0. Capsule 3- 

 celled, 3-valved. 



70. LEG HE A. Cal. 3-leaved. Pet. 3. Style 0; stig. plumose. Caps. 

 3-celled, 3-valved, with as many interior valves opposite the others; 

 cells 1-seeded. 



71. PROSERPINACA. Cal. superior, 3-parted, persistent. Cor. 0. 



Nut bony, triquetrous, 3-celled. 



TRIANDRIA. 



MONOGYNIA. 

 Species. 16. IRIS. Flag. Flower-de-luce. 



I. versicolor: flowers beardless; stem terete, more or less flexuous; 



germen somewhat triangular ; leaves ensiform. 



HAB. In water. May June. 7J.. Reot large, creeping; 23 ft. 

 high ; Jl. blue, variegated with yell. 



17. XYRIS. Yellow-eyed grass. 



X. caroliniana : leaves linear, grass-like ; scape ancipitous ; head ovate, 



rather acute ; scales round. 



HAB. Swamps, and wet sandy places. July Aug. Tj.. /Scape erect, 

 simple, 1 ft. high ; Jl. yell, in a small scaly head. 



18. SISYRINCHIUM. Blue-eyed grass. 



S. anceps: scape ancipitous, winged, simple, nearly leafless; spathe 

 about 4-flowered, unequal, shorter than the flowers; petals mucro- 

 nate. 



HAB. In wet meadows. May June. 1+. Stem slender ; leaves grow 

 like; Jl. small) blue; caps, globose. 



