Motnnifjne. S T I P A. 69 



lato-acuminatis, subaeqiialihus, valvula inferiore 7 lineali, fere 

 uUra mcdium usquc undicjue pilosula, apice barbulata duplo lon- 

 gioribu»; arista persistcnte, tortili, flexuosa, pubcscendo-hirtula, 

 3i pollicari; antheris tenui-barbatis. 



Stipa juncea Pursh Fl. Am. bor. 1. (18H,) p. 72? ad ripas fl. Mis- 

 souri m. Augusto kcta. (Ilb. Lewis.) 



Stipa robusta Nuttall! ('flosculo cum stipite 10 lineali). 



Arkansas (Nuttall!); Red river (Lindlcy!): Rocky Mountains ad fl. 

 Nfissouri. (ITookcr Catal. n. 253 !) 



Radix tibrosa, perennis. Cidmus cum panicula 1| — fcre 3 pedalis, 

 simplcx, stricte erectus, dcorsum scabriusculus, nodis 3 glabris. Fagi- 

 nue internodiis longiores, subglabrac. Ligidae obtusae, infcrior brevissi- 

 uia, reliquae 1 — 2 linealcs. Folia fasciculorum involuta, pedalia, cul- 

 mea sacpe complanata, pl. min. lincam lata, 6 — 7 pollicaria, in pagina 

 supcriorc scabra, viridia. Panicula !«• — 6 pollicaris, stricte erecta, con- 

 tracta, subpauciflora. Jxis communls deorsum scaber, per spatia 1 — 

 2| pollicaria radiolosus. Pedicelli alii spicula multo breviores, pauciores 

 pandcm subaequantcs, luspidi. Spiculue 16 lineas longae, pallide viri- 

 des. Glumae parum inaequalcs, inferior nunc paullo longior, nunc bre- 

 vior, lanccolatae, infcrne latiusculac, supernc subulato-acuminatac, gla- 

 brae, utraque 5 nervis. Vahndae insidcntcs stipiti obconico , ima basi 

 nudo, dcin livide-l. in maturis obsciu'c-brunneo, valvulis subduplo bre- 

 viori, undique piloso; primum flavendo-viridulae, dcmum fuscac: infe- 

 rior 7 1. fere 8 lincalis, inf( rnc ad mcdium usque fcre undiquc-, mar- 

 ginibus ad apicem usque pilosula, ipso apice brcvccomosa ; superior acqui- 

 longa, nuda, apice acutiuscula, dissitc binervis. Antherae 3, lineares, 

 apicc tcnui ct satis longc; barbatae (?). Lodiculae sqq. lanceolatae, una 

 fcre I longior ct latior. Caryopsis seutcllo suo 7-plo longior. 



