428 MONOCOTYLEDONEE. ANDROPOGON. 
culum communem parum—subduplo superantes. Racemi 2—3" erecti, 
3—4 em. longi, erassiuseuli, longe albo-villosi; articuli pedicellique 
spicula sessili '/, breviores, tenues, lineares, apice non cupulati, mar- 
ginibus villis æqualibus laxiusculis longissimis (12—16 mm. longis) 
mollissimis vestiti. Spiculæ sessiles 3,5 mm. longs, anguste lineari- 
oblonga, griseo-virides et violaceo-suffusc : gluma I”: acutiuscula, inte- 
gra, praeter carinas aculeolato-scabras enervis, dorso leviter impresso 
glabra, callo pilis parcis gluma 3—4-plo brevioribus barbato ; II^ 
abra, III* oblonga, acutiuseula, enervis, glabra; IV* quam II? paullo 
brevior, lanceolata, 1-nervis, subintegra, glabra, paullulo infra apicem 
aristam exserens gracillimam 3—4 mm. longam glumas parum exce- 
dentem. Antherz 0,7 mm. longae. Stigmata late oblonga, 1,5 mm. 
longa. Spiculæ pedicellat@ 9 v. raro abortu neutre, lanceolata, 
4,5—5 mm. longs, sordide violascentes, glabrz: gluma I"* acutis- 
sima, 3-nervis, callo glabro; II^ cum HE 1-nervis, acuta, glabra, IV* 
reliquis brevior, ciliata ; palea glumä duplo brevior, obtusa, ciliolata. 
Antherz 2 mm. longa. 
In arenosis pr. Montevideo (Arechavaleta in h. m.). 
xx drug Nae suberectis v. patulis gear v. flavescentibus articulum :quantibus, subequantibus 
ro) parum usque ad duplo superantibus vestiti, Vagin2 innovalionum compress&, culmez tere- 
tiu irum v. subcompresse (n. 50-34). 
9 Laminz e basi plus minusve angustata sublanceolato-liueares, sensim longe acuminate (n. 50—52}. 
50. A. platyphylius; vaginis glabris, laminis levissimis, racemis 
dense eanescenti-villosis, villis articulis duplo longioribus. 
Culmi ex omnibus nodis ramosi, ramis inferioribus foliiferis, summis 
1—2 floriferis simplicibus strictis subfastigiatis. Ligula brevissima, 
quam lamine basis latior, utrinque in auriculum truncatum producta, 
fusco-membranacea, glabra. Laminz e basi valde angustata lineari- 
lanceolat&, 12—20 em. longs, 12—16 mm. late, a medio acutatæ, 
longe acuminatze, flaccidulze, lzete virides, etiam margine læves, costa 
media tenui minime carinata supra anguste albolineata, nervisque 
tenuibus distantibus percursze. Racemi 3—4^! a vagina summa laminá 
4—10 em. longà 4—10 mm. latá instructá remoti, 7—9 em. longi; 
articuli pedicellique spicula sessili duplo v. plus duplo breviores, cras- 
siuseuli, subelavati, apice appendice cupuliformi parvulo inzqualiter 
dentieulato coronati, villis eanescentibus articulo duplo longioribus 
vestiti. Spicule sessiles 6 mm. longs, lineari-oblongz, flavo-vires- 
centes; gluma I" acutiuseula, subbidentula, przeter nervos carinales 
