274 MONOCOTYLEDONEJE. RHYTACHNE. 
sime mutica, rhacheos cavum postice clausum oceludens ; I“ char- 
tacea v. membranacea, carinata, sepe aristata; III’ hyalina, paleam 
sæpiusque florem c fovens, raro vacua ; IV* cum palea hyalina, hzc 
enervis, illa 1-v. tenuissime 3-nervis. Lodieule cuneatæ. Stigmata 
varia. 
‚Gramina Afriez tropiex, graeiliora v. gracillima, gluma I» rugosa 
v. murieulata. Species typica a cl. Desvaux in Antillis (insula speciali 
non indicata) leeta dieitur, quod valde dubito. Nemo botanicorum 
recentiorum ex Antillis retulit, sed in Africa tropica leeta est, ubi 
etiam aliæ hujus generis species '. — Genus et Vossi: et Rottboelliis 
valde affine, ab his non semper certe distinguendum. 
Subgenus 1. EuRHYTACHNE. 
Raeemus solitarius. Spiculæ sessiles sepissime bifloree. Stigmata 
stylos zequantia, per anthesin intra glumas erecta, non exserta. 
Perennes. Culmi graciles, erecti, glaberrimi, simplices. Vaginze 
teretes, strictze, glaberrimze, costatze, inferiores internodiis longiores, 
superiores breviores, summa cum lamina evoluta. Lamin:z e basi 
»quilata vaginà angustiore angustissime lineares, plerumque compli- 
eat, ereeto-patulze, extus glaberrimze, intus puberule v. scaberrim:e. 
costa media tenui l-nervi munitze, nervis lateralibus utrinque 2—4 
intus prominentibus pereurse. Racemus gracilis, erectus, glaber; 
articuli spieulam subaquantes v. ea !/, breviores, erassiusculi, lineari- 
subelavati, dorso eonvexo costati, scaberuli v. lzeves. Spiculæ sessiles 
oblongz, eum callo anguste annuliformi a reliqua gluma sulco pro- 
fundo distincto 4—5 mm. longze, glabrze ; gluma I»* marginibus angus- 
tissime inflexa, per lucem transparentem 7-nervis ; II** I^» subzequans, 
lanceolata, 3-nervis, acute carinata; IV* tenuissime l-nervis, ejus 
palea gluma subduplo brevior, oblonga, obtusiuseula. Pedicelli oblique 
lineari-laneeolati, subeontorti, complanati, dorso costati. 
1. R. rottbellioides Desv. l. c., p. 12; Opuseul. p. 75, t. 6, 
f. 1; foliis setaceis acutis ; rhacheos articulis apice glabris; gluma I^" 
spiculæ sessilis exalata, aristula unica raro duabus inzequalibus ipsá 
4—6-plo brevioribus abrupte terminata, II** eum seta ipsá 2-plo bre- 
* Indicationes patriæ plantarum in herbario Desvauxii ssepe incertas, confu- 
sas, arbitrarias v. nullas fuisse non solum ex « Opuseulis > elucet sed etiam in 
A. de Cand., Phytographie p. 408, aperte declaratur. 
