70 TRlAIfDRIA. DIGYNIA. 



number. The perlsporium appears almost precisely the 

 same as that of many species of Festuca. 



Species. 1. U. paniculata. 2spicata. 3. laiifolia. 4. niti' 

 da. 5. ^raciUs. ( \n American genus.) 



99. *WINDS()RlA.t 



Calix raiinate, many -flowered, 2-valvecl; 

 valves rather lare:e, scariose, uninervial, acute 

 or cuspidate. Spikelets thi( k; flowers closely 

 incumbent, and (listichally imbricated; nerves of 

 the dorsal valve mucronate, with intermediate 

 dentures, ciliate below: inner valre mostly na- 

 ked, emare^inatc. Styles slender, with simply 

 pectinated stigmas. Seed cahilbim, corruij;ate, 

 impressed with a flat, cential, oval bilum near 

 its base. 



Flowers paniculate, branches few, decompound, spread- 

 ing, and fli-xuose, stipules always pilose; spikelets nearly 

 sessile, tumid, generally pur|;le; corolla glumes short, 

 indurated, somewhat catilagmous; nerves ending iw short 

 cus[)S or minuie awns; flowers villous at the base, and 

 along the lower margin of the nerves in the outer valve; 

 the inner valve impressed, smooth, or when seen through 

 a lens obsoletely margined with a slender ciliate pubes- 

 cence, (never conspicuous as in Bromas^) the lower in- 

 flected margins projecting. S\amina 3. Styles 2. Germ 

 angularly truncate. Seed sliort, nearly in the form of a 

 slipper, on the external side obliquely compressed, on the 

 other convex. Peiisporium 2-leaved, obtuse, entire. 



Species. 1. W. Poxformis^ {Poa SesleroicleSy Mich. 

 P. quinqxiefida, Pursh. Spikelets mostly 5'flowered, exte- 

 rior valve of the corolla ovate, convex, tricuspidate, with 

 2 intermediate teeth, inner valve with 2 setaceous points, 

 smooth.) 2.ambi^iiay {Poa ajnbigua, Elliott ) Panicle 

 small, naked, ramuli nearly simple, alternate; spikelets 

 ovate, thick, sessile, 5 to 6-floweied, dorsal valve 5-tooth- 

 ed, interior valve deeply impressed, smooth. In both 

 these species the stigmas are pnirple and plumose. 



This genus appears to be considerably allied to Bro- 

 miis, possessing, however, much more the habit of Poa. 



f In respect to my earliest Botanical friend, John Windsor, 

 M. D., F. L. S., an assiduous P'>nglish Botanist, not unknown to 

 the president of the Linnsean Society, as a humble though not 

 a popular contributor to his classical Flora of Britain. 



\ 



