ROTTBOELLIA.  ANDROPOGONEJE (AUCT. EDUARDO HACKEL). 301 
sessiles zequantes, lanceolato-oblong&, sessilibus similes nisi gluma 
I^ altero tantum margine inflexa, flexura a basi ad apicem late alata, 
obtusa, integra; II per totam carinam alata, ala non truncata; flores 
ambo gj. 
Africa tropica ad Sierra Leone (Afzelius in h. Berol.). 
Obs. 1. Affinis R. digitatze Sm. (cfr. Subg. Pholiurus), sed semper 
racemis solitariis. — 2. R. tripsacoides Lam. Ill. gen. 1, p. 205, t. 48, 
fig. 1 b, e Sierra Leone, quantum e figura rudissima diagnosique bre- 
vissima divinare licet, est species huic affinis vel fortasse eadem. Certe: 
non est R. compressa, quaeum auctores (cum dubio) conjunxerunt. 
D. Spieule sessiles uniflore; gluma III: sepissime vacua, raro eum palea, semper sine flore. 
— Perennes. Innovationes extravaginales. Culmi glaberrimi. Racemi fragillimi, arti- 
culis glabris recte disjungentibus (n. 17— 27) 
* Lamin® e basi subangustata a vagina parum distincta sublanceolato-lineares, longe setaceo- 
acuminat&®, vernatione convoluta, adulte plane, 8—25 mm. latæ, costa media inferne 
crassa multinervi supra late albo-striata percurs®.— Gerontogee. — Culmi erecti, elati, 
sepe arundinacei, teretes, superne florifero-ramosi, ramis ad nodos superiores 3——5^is 
mp erectis gracillimis, simplicibus v. primariis ramulosis, superioribus subfasti- 
Vagins teretes, arctz, inferiores internodia superantes, superiores iis breviores, 
summa ramorum Mams sabios v v. rudimentum laminæ ferens. Ligula brevis- 
sima, truncata, f næ rigidulæ, virides, nervis lateralibus cre- 
berrimis tenuibus non prominentibus um se subzqualibus pereurs®. Racemi graciles, 
erecü, subeylindrici, e vagina summa demum longiuseule exserti; articuli crassius- 
culi, extus vonvexi et viridi-striati, facie exeisi (nec excavati), sursum sensim incras- 
sati. Spieule sessilis glumæ omnes glabrs : I”? obtusa, marginibus anguste inflexa, 
eallo angustissime ainplitoted a reliqua gluma rima profunda distincto; II^ primä 
paullo brevior, acute carinata, carina non sinuata, 1-nervis; III: Idm squans, hya- 
lina, enervis; IV* et in inter se et cum III? »quales, ovatz, hyalinz, IV* tenuissime 
l-mervis. Anthers 2 mm. longs. Styli stigmata linearia zquantes, Pedicelli artienlos 
re eisque arcte appressi, similesque sed angustiores, planiores, lineares. Spieuls 
pedicel in omnibus speciebus nunc tabescentes parve, uniglumes, nunc evolute, 
Amy P = (n. 17—19). 
17. R. striata (Nees! in Steud. Synops. 1, p. 361); spiculis ses- 
silibus lanceolato-oblongis; gluma I"* coriacea, infra ipsum apicem 
breviter inzqualiterque alata, margine inferne levi, dorso inferne 
(saltem supra basin) striis impressis 4—6 notata. 
Culmi graciles, 1 m. v. plus alti, cum ramis lzves, infra racemum : 
incrassati. Ligula glabra. Racemi pallidi ; articuli spiculam sessilem 
subzquantes, diametro 1—1,2 mm. Spiculæ sessiles rhacheos cavum 
apice excedentes, callo glabro; gluma I™ carinis lzevis, dorso convexa, 
