ISCHEMUM, ANDROPOGONEJE (AUCT. EDUARDO RER 201 
ti jlis) Spiculz 
aristata vel rarius pedicellata (rarissi 
sessilis gluma I"* coriacea v. chartacea, mutica, marginibus saltem 
infra apicem acute implicatis bicarinata, dorso plana v. subdepressa ; 
II^ superne saltem carinata, interdum aristata ; III* sepe membra- 
naceo-chartacea, raro hyalina, mutica, paleam similem floremque c 
triandrum (rarissime 2) fovens ; IV* hyalina v. membranacea, sæ- 
pius bifida et e sinu aristam perfectam exserens, rarius imperfecte 
aristata v. mueronata, rarissime mutica, plerumque 3-nervis, nervis ad 
aristze ortum (vel in mutieis apice) confluentibus. Palea glumam IV*» 
squans v. subsuperans, hyalina, enervis v. raro binervis. Lodicul® 
cuneatze, truncatze, ovarium plerumque »quantes, in flore d’ minores. 
Stamina 3, floris 8 interdum hebetata. Stigmata oblonga, stylos ple- 
rumque zequantia v. raro superantia, supra mediam spiculam exserta. 
Caryopsis varía. 
Gramina zonam tropieam presertim orbis antiqui incolentes, ple- 
rumque perennia, humiliora, loca humida amantia. — Culmi fareti. 
Folia vernatione Spisime NO, Adulta plana, sæpius latiuscula; 
v.leviter concavi, 
interdum satis crassi ad Rottboelliarum formam accedentes. Spicule 
sessiles sæpe latiuseule, a dorso compresse, pedicellatze vero in mul- 
tis speciebus a latere compresse, gluma I"* carina media instructa 
apparent. Sed omnes species conferenti facile perspicuum erit, hane 
carinam re vera esse lateralem, solemnium duarum lateralium, altero 
obsoleto, unum superstitem. Nam in I. aristato affnibusque hzc 
gluma I™ utroque margine aqualiter angusteque implicata, bicari- 
nata, in I. mutico altero tantum margine distincte lateque altero 
obsolete implicata, quo fit ut carina una reliquatur in hac specie mani- 
feste lateralis, quoniam pars implicata reliqua angustior est; in 
I. ciliare aliisque vero hzc pars reliquam sequat v. subaquat, inde 
gluma a latere compressa, carina media instructa apparet. Callus 
glumæ Im® obtusus, plerumque latus. Gluma II“ eadem consistentia 
quam I= ; IIl* quam I™ paullo brevior. Flos 9 masculo pr&cocior, 
ejus antherze plerumque jam delapse sunt, cum floris c? pollen spar- 
gunt « et ignarus hujus economic naturz putat eos (scil. mares 
floris 8) non adfuisse » (Forsk. Fl. »g.-arab. p. 178). 
Subgen. 1. EutscHAEMUM. 
Racemi in apice culmi ramorumve bini v. digitati, v. corymboso- 
fasciculati v. rarissime subpaniculati, alter (v. alii) pedunculatus, 
pios 
RA 
Pr 
