310 MONOCOTYLEDONEE. ROTTBOELLIA. 
lata, carinis superne anguste membranaceo-alatis, ala erosula, intus 
9-nervis; II“ I» æquans, chartacea, late ovata, acutiuscula, 5-nervis, 
carina scabra; sequentes hyalinse : II? primä paullo brevior, late 
ovata, acutiuscula, subenervis, marginibus anguste involutis, vacua 
v. in aliis spieulis (ejusdem culmi) paleam includens ovatam bidenta- 
tam subenervem floremque c? hebetatum, antheris brevissimis pol- 
line parco repletis; gluma IV* IP" æquans, elliptica, acuta v. 
submueronulata, 1-nervis; palea glumam æquans, ovalis, obtusa, 
subenervis. Floris 8 antherz 1,5—2 mm. longs ; stigmata linearia, 
stylos subsuperantia. Pedicelli articulos sequantes, iis appressi, basi 
tantum rima ab iis separati, lineares, compressi, dorso profunde sul- 
cati. Spiculæ pedicellatee tabescentes, 1,5 mm. longe, ad glumas 
T»», II?» (utraque coriacea, obtusa), II^ parvulam redactze. 
Brasilia? (Sello); Montevideo (Arechavaleta in h. m.). — Specimina 
Selloana, loco speciali non indicato, ut etiam pr. Montevideo lecta 
essent fieri potest. 
tt Pedicelli apice altero lat iculo oblongo obtuso v. acutiusculo 4,5 mm. longo coriaceo muniti. 
' 27. R. aurita Steud. Synops. 1, p. 361; Ischæmum auritum Nees! 
Steud. l. c. 
Tota glabra. Culmi 1—2 m. alti, multinodes, erecti, superne 
ramosi, ramis solitariis v. binis, in specim. robustis 3—5"'s, longis, 
primariis 2—3-nodibus, ramulos secundarios 2—5"* procreantibus, 
conjunctim paniculam foliosam laxiusculam formantibus. Vaginæ 
‚lax®, striat®, inferiores internodia superantes, superiores iis multo 
breviores, summa ramorum floriferorum aphylla, spathiformis. Ligula 
brevissima, truncata, ciliolata. Laminz e basi in vaginam decurrente 
lineares, sensim angustate, acutiuscule, complieate, 15—60 em. 
long&, explanate 4—8 mm. late, rigid, glauco-rubrze, superne sta- 
br&, inferne leeves, carinat®, costa media supra non albostriata, 
nervis lateralibus intus prominentibus validiusculis percursæ. Racemi 
longiuscule peduneulati, pedunculo terminali exserto lateralibus sæ- 
pius vaginatis, subeylindriei, stricti v. plus minus arcuati, virides 
v. violaceo-suffusi, densiflori ; articuli subelavati, facie leviter ortish, 
estriati, scaberuli. Spiculæ sessiles cum callo 
a reliqua gluma rima separato 4—5 mm. longæ, oblongæ, a dorso 
valde compressæ, rhacheos cavum undique excedentes, glumis omni- 
bus glabris : I"* coriacea, eum alis late oblonga lateribus parallelis, 
apice profunde emarginata, demtis alis lanceolata, marginibus anguste - 
