180 
AVENA, 
Cal. albus, S-valvis insequalibus muticis 2-floris, 
uno flore mutico, altero aristato® 
Cor. % valvis, calice paulo major, basi barbata, 
arista ad basin valvulae exterioris geniculata 
corolla duplo longiore. 
Siam. 
Pist. 
Semen 
Radix 
Habitat in Pennsylvania et Carolina Septentrio* 
nali. 
5 . AVENA PALUSTRIS. Mich. 
Culmo sesquipedali nodoso, nodis glabris. 
Foliis lineari-lanceolatis nervosis glabris. 
Vagina striata glabra. 
Ligula parva barbata. 
Panicula contracta ; ramis inaequalibus 4—6, uni- 
floris et plurifloris glabris. 
Cal. valvis acutus marginatus 2-fiorus, flore uno 
sessile, altero pedicellato, pedicello pubes* 
cente. 
Cor. 2-valvis, floris sessilis acuminata, pedicellati 
arista sub apice obliqua, valvula minore emar 
ginata. 
Habitat in Carolina et Cherokee — floret nobiseum 
fine Maii. 
Pedicelli sub calice incrassati, variat floribus 3. 
