TRIAND1UA, DIGYNIA. R 



ORDER II. DIliYNIA. 



IS. Mvhlenbergia, Schreber. Gen. pi. 103. (Gramincx.) 



Calx very minute, truncated, 2-valvcd, une- 

 qual. Corolla 2-valved, hairy at the base, 

 exterior valve terminating in a blender awn. 

 (Style 1?) Xutt. 



1. M. culm compressed smooth branched, jointed, diffu». 

 joints smooth. Branches alternate spreading or 

 erect. Leaves linear-lanceolate, smooth, keeled, 

 dotted, transparent. Ligula obsoletely ciliated. 

 Sheath striated, pubescent at the mouth. Pani- 

 cle narrow divided thread-like, peduncles and 

 pedicels rough. Cal. 1-valved, small, lateral, 1- 

 flowered, persistent. Cor. 2-valved, one of the 

 valves awned, the awn terminal, purplish rough, 



a little longer than the corolla. Stam.3, anthers 

 white, as long as the corolla. Pist. 2, styles 

 white, stigmas feathery purplish. Seed oblong, 

 acuminate. Muhl. 

 Dilepyrum minutiflorum, Mich- 



Spreading Muhlenbergia. 



In dry fields not uncommon. Near the Buck-Inn, on the 

 Lancaster road, abundant. Perennial. July and August. 



2. M. culm erect three feet high simple jointed, erc«u* 

 joints pubescent. Leaves lanceolate alternate 

 nerved. Ligula short, serrated at the ape*. 

 Sheath decurrent, striated, smooth. Panicle nar- 

 row, simple. Cal. lateral, linear, 1-valved, mi- 

 nute. Cor. 2-valved, green, one valve 9-nerved, 

 pubescent with a terminal awn, three times the 

 length of the corolla ; the other smaller bifid at 



the point, grooved on the back, carinate internal- 

 ly, awned at the base. Stam. 2, filaments white, 



