TRIANDKIA, DICiYNIA. 63 



Bnzavirens ? Walter. Flor. Car. 79. 



Closely allied to the B. Eragrostit, ( Poa megastachya, J but 

 readily distinguished by its unbranched weak, and compres- 

 sed stem, the length Off its leaves, which are not involute and 

 rigid, the scattered few-Howered panicle, and particularly the 

 obtuse points of the flower glumes, and lastly by the calix, in 

 which the larger valve is 3-nerved, and consequently similar 

 to the corolla, while the calix glumes of the Poa megastachya 

 have each but a single nerve, a character which not only dis- 

 tinguishes it well from the present species, but also from the 

 P. Eragrostis, in which the larger valve of the calix is also 

 3-nerved, similar to the corolla. Nuttall. 



P. obtusa, Nutt. 



I detected this plant in the neighbourhood of this city two 

 years ago, find gave specimens to Mr. Nuttall, who has de- 

 scribed it as above. I have changed his specific name, be- 

 cause it was previously given by Muhl. to No. 12. July. 



56. Briza, Gen. pi. 115. (Gramincix.J 



Calix 2-valved, many-flowered. Spikelets dis- 

 tichous, valves ventricose, cordate, obtuse ; 

 interior valve minute. Nutt, 



l.Bculm geniculate, jointed. Leaves lanceolate ere grouis.- 

 nerved alternate, scabrous on the margin, some- 

 times hairy. Ligula white, beard-form. Sheath 

 striate, neck hairy. Panicle spreading. Lower 

 branches of the panicle solitary, upper ones in 

 pairs and threes, hairy in the axil. Spikelets 

 ovate-lanceolate pedicellate. Cal. 2-valved, 12 — 

 20 flowered. Cor, 2-valved, valves striate trans- 

 parent unequal ; the interior less, pubescent. Muhl. 



B. Canadensis of Mich, according to Swartz. 



Poa megastachya. 



Poa Caroliniuna, Walt. ? 



The spikelets of a leaden, or bluish-green colour. In Jer- 

 sey very common in the sandy roads. Annual. July, Au- 

 gust. 



2. B. culm erect glabrous ; leaves long, scabrous on caajuiuuu. 

 the back. Spikelets ovate erect. Cal. 2-valved 

 lanceolate less than the corolla 7-flowered unequal 

 small. Cor* 2-valved the exterior ovate acute 5- 



