TRIANDRIA DIGYNIA. 
pratense. 
87* TRISETUM. Pers. ench. 1 . p. 97 . 
1. T. panicula subcontracta, spicis nitidis, vaginis longis 
striatis glabris, foliis superne villosis. Pers. 1. c. 
Avena flavescens. Willd. sp. pl. 1. p. 44 g. 
Icon. Schrel. gram. t. g. Host. gram,. 3. t. 38. 
In meadows ; Pensylvania and Virginia, rare. 1/ . July. 
V. v . 
pumila . 
89 . AIRA. Gen.pl. 112 . 
1 . A. panicula parva fastigiata (paucidora) : pedicellis bre- 
vibus, floribus muticis obtusis calyce duplo longiori- 
bus : valvulis margine membranaceis, foliis planis gla- 
bris, culmo erecto vix foliis altiore. 
On barren clay soil, near brick-yards : Pensylvania. If . 
June. v. v. Scarce an inch high ; in close tufts. 
aquatica . 
2 . A. panicula patente semiverticillata, floribus muticis ob- 
tusis laevibus calyce longioribus, foliis planis, culmo 
repente.— WUld. sp. pl. 1 . p. SJQ. 
Jeon. Host. gram. 2. t. 41. Engl. lot. 1557- 
On water sides and sometimes floating in water, frequent. 
11 . May — July. v. v. 
melicoides. 
3. A. panicula parva subracematim coarctata : gluma com- 
muni partialibusque majusculis lineari-lanceolatis mu- 
ticis : floribus basi villosis, rudimento flosculi tertii, 
altus at a. 
foliis planis glabris, culmo erecto. Midi. jl. amer. 1 . 
p. 62 . 
In shady woods : Canada to Pensylvania. If.. July. v. v , 
4. A. panicula in racemum oblongum confertiflorum co- 
arctata, floribus muticis apice compressis, glumae val- 
va altera angusto-lineari acuta : altera lato-obovali ro- 
Irevifolia . 
tundato-obtusissima, foliis planis, culmo gracili erecto. 
Mich.Jl. amer. 1 , p. 62. 
In dry fields : New England to Florida. If . June, July. 
V. V. 
5. A. panicula semiverticillata patente : ramis simplicius- 
culis aUernifioris,, floribus muticis calycem aequan- 
tibus, glumis omnibus lanceolatis acutis, foliis planis, 
culmo stricto glabro nudiusculo. 
In the plains of Missouri. M. Lewis. If. . June, July. 
v. s. in Herb. Lewis. This grass is the most common 
in those plains. 
capillacea . 
6. A. panicula capillacea effusa, flosculis muticis calyce 
