ISCHEMUM. ANDROPOGONEÆ (AUCT. EDUARDO HACKEL). «14291 
Culmi genieulato-ascendentes, graciles, 30—40 cm. alti, plurinodes, 
subsimpliees v. e nodo penultimo ramum floriferum subfastigiatum 
proferentes, teretiusculi, superne breviter nudi vix inerassati. Vagi- 
næ teretiusculze, laxiusculze, inferiores internodia superantes, superne 
pilosule, summa subinflata, laminam brevissimam ferens. Ligula 
ovata, 2 mm. longa, rotundata, albo-membranacea v. subhyalina, ero- 
sula, glabra licet ad latera pilis stipata. Laminæ e basi valde angustata 
rotundata lineari-lanceolatee, setaceo-acuminat®, 8—10 cm. longs, 
5—8 mm. lat, virides, glabrze v. basi pilosulie, margine scaberrimze, 
ceterum læves. Racemi 3,5—4,5 em. longi, subgraciles, pallide flaves- 
centes, valdepilosi; articuli pedicellique spicula subduplo breviores, 
crassiusculi, basi leviter exeisi, angulo BERNER pilis alhis rigidulie 
ereeto-patulis summis articulum 
brevibus patentibus mollibus ciliati. Spiculz sessiles oblongo-lanceola- 
tee, callo 1—1,5 mm. longo pilis ipsum superantibus barbato, flavid:e ; 
gluma I: bidentata, in '/, inferiore subcoriacea, laevissima, estriata, 
in ?/, superiore herbaceo-chartacea, distincte 4—5-striata, pilis glu- 
mam superantibus adspersa v. dense obsita, carinis marginatis v. 
angustissime alatis; II“ I” subsuperans, chartacea, breviter aristu- 
lata, earina marginata, prope carinam pilosa, margine ciliolata; 
III: re subzequans, hyalino-membranacea, 1-nervis, glabra v. cilio- 
lata; palea ejus similis, 2-nervis; IV* quam II^ */, brevior, oblonga, 
hyalina, ad '/, usque acute bifida, ciliolata; arista gracillima, patens, 
12—17 mm. longa, columná brevissimä latente quam subula laxe 
torta flavida v. subviolascens 6—8-plo breviore. Spiculæ pedicellatze 
elliptic, longe pilosz, callo pilis gluma 2—3-plo brevioribus cincto ; 
gluma I" lineari-lanceolata, carina marginata, 7—9-nervis ut II" 
pilis glumam longe superantibus vestita. 
Ins. Bourbon (Boivin, 992). 
Obs. I. fasciculatum (nr. 29) et I. guianense (nr. 30) variant inter- 
dum racemis binis, et tum ad species hujus subdivisionis accedunt. 
tt Spicularum peoicellatarum glumæ I** et I1* zeug v. saltem mucronate. Spicule sessilis gluma T=* 
carinis non alata nec marginata, II“ aristata. — Culmi teretiusculi, simplices v. raro ramo 
aucti, apice vix incrassati. rege om a 1-1,5 mm. longo pilis ipsum (sæpe duplo) supe anti- 
bus barbato 5—6 mm. longe. Gluma v. subcoriacea ; II^ item, carina scabra; 
iile membranacea, 1—3-nervis, glabra ; i rjr enin bifida; arista perfecta. — Species 
4 inter se valde affines (n. 17—20). ; 
17. I. lutescens; vaginis superne glabris nodis latere dorsali 
longe barbatis, ligula elongata ; artieulis omnibus angulis pilis ri 
lis lutescentibus dense ciliatis. 
