GRAMINÉES. 285 
glumis subsimilis membranacea imparinervis, demum rigescens, 
glabra v. pubescens, 2-nervis. Glumellulæ 2, irregulares. Stamina 3. 
Siyli breves distineti plumosi. Fructus ovoideus v. oblongus, glumellis 
arete inclusus at liber. — Herbæ annuæ v. perennes; foliis planis; 
panieula composita laxa, effusa v. raro stricta; spiculis pedicellatis ; 
rhachilla sub glumellis articulata, ultra florem haud producta. (Eu- 
ropa et Asia temp., America bor.!) | 
1929 Aciachne Beta. — Flores (fere Agrostidis) hermaphroditi 
rminales, sæpius solitarii#. Glumæ 2, scariosæ muticæ persistentes, 
x-nerves. Glumellæ 2 : extima glumis multo longior rigida longe 
aculata arete involuta, imparin ervis; intima autem multo brevior 
obtusa parinervis inclusa. Glumellulæ 2, obovato-oblongæ membra- 
naceæ majuscule. Stamina 3; filamentis gracilibus ; antheris oblongis 
subapiculatis, subextrorsum 2-rimosis, primum margine cohæren- 
lbus. Germen oblongum, apice emarginatum ; stylis distinctis, apice 
plumosis. Fructus (immaturus) ovoideo-oblongus, hinc suleatus, 
inelusus at liber, — Herba perennis humilis cæspitosa pulvinata ; 
ramis ce ; foliis distichis; vagina semi-amplexicauli membranacea, 
apice in ligulam obtusam producta ; limbo dorsali recurvo rigido ; 
marginibus incurvis contiguis; peduneulo terminali rigido, tereti 
V. obtuse angulato, supra glumas persistentes articulato ; pedicellis 
hteralibus, dum adsint, 4-3, terminali adnatis. (Bolivia mont.*) 
193. Lyeurus H. B. K.5— Flores (fere Muehlenbergiæ) in spicula 
solitarii hermaphroditi. Glumæ 2 : extima 2, 3-nervis; nervis in 
arislam productis, nune usque ad basin liberis; intima autem angus- 
or, 1-aristata. Glumellæ 2 : extima glumis major el Jongius aristala ; 
vu autem minor tenuior, 2-nervis, 2-Carinalà, apice breviter 
?-dentata. Stamina 3. Styli distineti breves, apice plumosi. Fructus 
"IX inclusus liber. — Herbæ, basi cæspitosæ; foliis angustis, Sæpe 
‘ltilate convolutis ; inflorescentia spiciformi cylindracea, € Vagina 
lolii supremi emergens, breviter pedunculata ; spiculis subsessilibus 
dns 5, 6. Host, Gram. austr., II, t. 22. 9. Nune in scapo eodem 2, v. rarius 3, À 
ee CHB., ce, FI. germ., t. 45, fig. 1456-1458.  (nomen unde specificum vix conveniens). 
Mon, Que. Pl: brit. W.-Ind., 534. — Vas. 4 Spec. 1: À: sn 
ülo, 7ge " Un--St., 56.— Borss., FI. or., V, 5. Nov. gen. et spec., Î, rt RE, 
à ps GREN. et Govn., FI. de Fr. UN, 407. En. 1, 208. EN CP pfansen- 
a, 119 00k. Icon., t. 4362; Gen., IL, 1143,  Gen., II, 1145, n- Du TRES ind 
ar : HACK., Pflansenfum., 41. — H. BN,  fam., 41. — Pleopogen NuïT., in Journ. Acad. 
- Soc. Linn. Par., 1034, 1073. Philad., ser. 2, 1, 189. 
