RHYTACHNE. | ANDROPOGONEJE (AUCT. EDUARDO HACKEL). 275 
viori. — Rottbellia Rhytachne Hack. in Bolet. Soc. Broter., 3 
(1884), p. 136, t. 2, f. 2. 
Innovationes intravaginales, cum culmi basi vaginis emareidis fir- 
mis inferne dilatatis cinctæ. Culmi graeillimi, 25 —40 cm. alti, 2—3- 
nodes, compressi. Ligula brevissima, truncata, membranacea, minute 
ciliolata, subauriculata. Lamine semper complieatze, diametro 0,5— 
0,6 mm., 10—20 em. longs, glaucescentes, subtrigon& v. pentagonze. 
Racemus 6—12 em. longus, erectus, glaber, flaecidulus, flavescens v. 
violaceo-suffusus, e vagina summa plus minus exsertus v. basi vagina- 
tus. Spieulze sessilis gluma I™ obtusiuseula, flexuris marginalibus in 
'/, superiore aculeolato-ciliolata, haud alata, dorso convexo a basi ad 
?/, usque rugis transversalibus crebris plus minus interruptis et inter 
se eostulis longitudinalibus connexis ornata; II“ chartaceo-membra- 
nacea, breviter acutata, carina levi superne sinuata; lil primá 
paullo brevior, ovali-oblonga, obtusa, subenervis, paleam paullo—'/, 
breviorem oblongam obtusam bidentulam enervem glabram, florem- 
que dj! antheris 2,5 mm. longis rarius hebetatis fovens. Gluma IV* 
ovato-oblonga, obtusiuseula. Stigmata oblonga, ferruginea. Pedicelli 
steriles glumiformes, articulos sequantes, superne ciliolato-seabri, 
apice in setulam eis 2—3-plo breviorem (interdum altera brevissima 
auctam) abeuntes. 
Angola: ad Rio Pallama (Newton in h. meo); ad fl. Congo pr. 
Brazzaville(Thollon in h. par.); « Antille » ex Desv. (sed collectore non 
indicato) in herb. DC., conf. not. ad ped. p. 274. — Forma angolensis 
paullo recedit a typica racemis violascentibus, eulmo in '/, superiore 
enodi, aristulis brevioribus, sed ne varietatem quidem efficere potest ; 
in forma congoénsi aristule glumæ I"** in spiculis aliis brevissime, 
in aliis nulle. 
2. R. triseta; foliis convoluto-filiformibus sensim capillari-aeumi- 
natis ; rhacheos articulis apice eiliolatis ; gluma I"* spicula sessilis in 
'J, superiore alata, in aristas 2 ipsà 2-plo breviores sensim abeunte, 
He cum arista ipsam æquante. 
Dense esspitosa; innovationes plerzque extravaginales. Culmi 
30—50 em. alti, teretes. Ligula in seriem ciliorum brevium soluta. 
 Laminz convolutz, 15—25 em. longs, explicate 1—1,5 mm. lat, 
erecto-patule, virides. Racemus 12—15 em. longus, basi vaginatus, 
versus apicem subattenuatus, pallide flavescens, strietior. Spieule 
sessilis gluma I™ apice acutiuscula, flexuris marginalibus ab '/, supe- 
riore ad apicem usque alis albo-scariosis angustis ciliis rigidis ultra 
