ROTTBOELLIA. ANDROPOGONEAR (AUCT. EDUARDO HACKEL). 285 
ssepius cum pedicellis coaliti et cum iis internodia formantes crassa, 
linearia, dorso leviter, facie profunde excavata, plus minus oblique 
raro recte v. minime disjungentia, disjuneta cicatricem planam exhi- 
bentia. Spieule primariz ob pedicellos articulis saepissime adnatos 
juxta spieulam secundariam internodii superpositi specie sessiles, 
omnes subeonformes, uniflore, a dorso compress&, muticæ ; gluma 
I"* coriacea, dorso plana, marginibus angustissime v. obsolete inflexa, 
callo oblique obeonico v. rectangulo v. indistincto, cavum rhacheos 
exacte oceludens v. apice excedens; II^ membranacea, subcarinata, 
rhachi sæpe adnata ; IN hyalina binervis, vacua ; IV* subenervis; ejus 
palea glumá multo brevior, enervis, raro 0. Stigmata stylis duplo 
longiora, supra spicule basin exserta. Spiculæ primarie gluma I7 
longius acuminata, praesertim in spicula terminali. 
Gramina szepius decumbentia et ascendentia, per regiones calidiores 
utriusque orbis late dispersa. — Perennes. Innovationes extravagi- 
nales. Culmi basi decumbentes et radicantes, dein erecti, subrobusti, 
30—150 em. longi, compressi, glaberrimi, multinodes, ramosi (raro 
simplices). Vagine compresse. carinat®, laxiuscule, internodiis 
multo breviores, summa ramorum aphylla, spathiformis. Ligula bre- 
vissima, truncata, membranacea, ciliata. Lamin:x e basi sequilata 
subrotundata lineares, vernatione conduplicate, adulte planse v. 
eanalieulatz?e, 6—40 em. longze, 2—7 mm. latæ (longitudine latitudi- 
neque in utraque specie valde variabili), rigidule, virides v. rubes- 
centes, glabrz (raro basi ciliat®), costa media l-nervi tenui supra 
haud albolineata munita, nervis lateralibus vix prominulis. Racemi 
(spieze spurise) recti v. leviter curvati, basi e vagina summa non v. 
parum exserti, articulis glabris. Spiculz lineari-lanceolatze v. lineari- 
oblong&, glabrae v. raro callo pilosule. Gluma I^" flexuris marginali- 
bus superne marginatis laevibus, dorso costulata, intus nitens, callo a 
reliqua gluma depressione levi separato; II** I” aquans, elliptico- 
lanceolata, acuminata, in eadem specie nunc rhachi (apice excepto) 
adnata, nunc libera ; III: primá '/, brevior, late oblonga, obtusiuscula; 
IV: adhuc paullo brevior, ovali-oblonga; ejus palea glumá 2—4-plo 
brevior, linearis, obtusa. Antherz: 2—3 mm. longe. Spiculæ pedicel- 
lat sessilibus sublongiores v. subbreviores, iis similes nisi angustiores, 
gluma I^* longius acuminata, 7-nervis, II^ rima puteis ee, 
chartacea, F^ subsuperans, acuminata, acu 
y. mucroniformi v. in aristam producto, acute carinata, carina excen- 
trica scabra ; spicula terminalis reliquis paullo major, longius pedi- 
cellata, glumä I™ et II^ adhue magis acuminatis, acumine ssepe extus 
