GRAMINEiE. 105 



PENNJSETUM. Rich. in pers. syn. 1. p. 72. 



Gluma biflora, bivalvis, inaequalis, valvula exteriore aliquoties 

 minore. Floscu/i dissimiles, exterior masculus v. neuter, 

 1 — 2-valvis, valvula exteriore textura glumae ; interior bi- 

 valvis, chartaceus, herruaphroditus. Sauamuhc 2 hypo- 

 gynae. Stamina 3. Styli 2, basi quandoque connati. 

 Stigmata plumosa. Senien perianthio subindurato tectum. 

 Spica (simplex v. divisa) Invo/uce/tis 1 — 3-rloris, polyse- 

 tis, setis distinctis ; nunc dimidiatis. 



Obs. Huc pertinent Panicum viride, verticillatum, helvolum. 

 A Paniuo dirfert tantummodo involucellis setosis, a Cenchro 



iisdem distinctis nec circa semc-n induratis; praesentia 



squamularum hypogynarum ? stylisque saepe distinctis. 



In Peunuetis quibusdam Richardi squamtfiae liypogynae 



forsan nullae. 



1. P. cowpressum, spica cylindracea simplici : rachi pubescenti, 



involucellis unifloris elongatis completis, nVribus lanceo- 

 lato-subulatis, flosculo hermaphrodito !aevi, stylis basi 

 connatis, foliis canaliculatis vaginisque glabris, culmo com- 

 presso. (J.) v. v. 



2. P. glaucum, spica cylindratea simplvci. involucellis dimidia- 



tis polysetis subrUninor> tiore ovato2— 3-plo longiori- 

 bus, flo.sculohermaphrodi ..■> rugoso, stylis distinctis, foliis 

 planis pilosiusculis : collo riico barbato, culmo ramoso. 

 (J.T.) v.s. 

 Panicum glaucum. L. 



3. P. ita/icnm, spica cyJiudracea composita, invoJucellis dimi- 



diatis unifloris flore ovato 2 — 3-plo longioribus, foliis 

 planis lato-linearibus marginatis scaberrimis, vaginis laevi- 

 bus: collo barbato pilis strictis. ( 1\) B. v. s. 

 Panicum italicum. L 



CEXXHRUS. L. 



Gluma biflora, bivalvi», valvula extcriore minore. F/nsfufi 

 dissimiles : exterior masculus v. neuter ; interior herma- 

 phrodttus. Syuamvice nullae hypogynae. Styli 2, infra con- 

 nati. Stigmata plumosa. InvoluveHum i -3-florum, 

 mttltipartitum, extus setosum, fructiferum inGuraium. 



X. C injiexus, involucris unifloris protunde 6— 7-fidis: laciniis 

 angusto-lanceolatis margine nudis : fructiferis inrlexis, spica 

 simplici cylindracea. ( I.) v. v. 



2 q2 2. C\ australis, 



