ROTTBOELLIA. ANDROPOGONEÆ (AUCT. EDUARDO HACKEL). 309 
v. obseletas) irregulariter foveolata v. areolata ; pedicellis linearibus, 
dorso minime depressis. 
Rami floriferi ad nodos culmi superiores solitarii, simplices, erecti. 
Racemi 6—8 cm. longi, diam. 4 mm., subeylindriei, sursum non 
incrassati, laterales basi vaginati, terminalis longiuscule exsertus, e 
pallide flavescenti e rufescenti varii; articuli spiculam sessilem subæ- 
quantes, sursum paullo dilatati, recti, basi non excisi nec dorso 
depressi. Spiculæ sessilis gluma I" a medio angustata, apice En 
obtusiuseula v. acutiuscula, obsolete bidentata, carinis in '/, v 
superiore anguste scarioso-alata, alis ultra apicem productis; II^ ic 
sequans, late ovata, carina excentrica elevata nee alata; II I» 
equans, binervis; IV* quam II“ parum brevior, acuta. Pedicelli com- 
planato-compressi, curvuli, non elavati, dorso 3—4-costati, scaberuli. 
a, genuina. Rugs elevatæ, reticulatze, foveis irregularibus profun- 
dis interruptze. — R. tesselata Steud.! Synops. 1, p. 362. 
B, areolata. Rugse obsolet, gluma I™ seriebus irregularibus areo- 
larum subquadratarum parum excavatarum (in media gluma inter- 
dum subobsoletarum) notata. 
America bor. : Georgia (ex Baldw.); Florida (ex Chapm.); Ala- 
bama (Mohr, alii; Louisiana (Riehl); varg in pinetis depressis humidis 
prope Mobile, Alabama (C. Mohr in h. m.). 
90 Culmi ab ima basi florifero-ramosi; vagina superne non angustatæ nec a culmo solute meque secus 
carinam connata. 
26. R. Selloana (Hack. in Mart. et Eichl. Fl. bras. 2, pars. 3, 
p: 312. 
Tota glabra. Culmi 40—50 em. alti, subéoitipréde ramis floriferis 
solitariis brevibus simplicibus. Vaginz laxæ, internodiis duplo bre- 
viores, leves. Ligula brevis, truncata, medio membranacea, late- 
ribus firmior, in cilia irregularia soluta. Lamin® e basi rotundata 
lineares, 12—15 em. longz, 3—5 mm. late, acutiuscule, flaccid:, 
subtus leves, supra margineque (saltem superne) scabra. Racemi 
basi vaginati, recti v. subarcuati, 6—10 cm. longi, viriduli ; articuli 
spiculam sessilem sequantes, lineares, dorso convexi v. obtuse costati, 
læves, facie profunde exeisi, disjuncti apice cavitatem oblongam pro- 
fundam exhibentes. Spiculæ sessiles cum callo anguste annuliformi a 
reliqua gluma rima separato 4—5 mm. longe, rhacheos cavum exacte 
occludentes, glumis glabris : I™ cartilaginea, late ovata, obtusiuseula, 
dorso subconvexa, longitudinaliter sulcata et inferne seriatim foveo- 
t 
