98 MÉMOIRE 8. 



Soudan Français. — Tabacoroni, au sud-ouest de Siguiri, dans les 

 lieux marécageux, 13 avril 1899, ii° 716 [Aug. Chevalier], 



NiGERrA DU Nord. — Nupe, savannes, n^ 1351 [Barter in herb. Kevv], 

 Haut-Chari. — Pays Ndouka et Konti village de Télé, 2-12 mai 1903, 

 n** 8251 [Aug, Chevalier]. 



Rottbœllia L. f. 



Rottbœllia afraurita Stapf, 



Affinis R. aitritac Steud., a qua diïTert spiculis paulo minoribus, gluma 

 inferiore spiculœ sessilis efovcolata, dorso tenuiore, distincte 3-4-nervi, 

 valvis cum paleis 1,3 brevioribus. 



Gramen perenne, glabmm. Culmi ultra 1 m. alti, mullinodi, erecti, 

 superne ramosi, ramis solitariis vél superne 2 vel pluribus inrrqualibus, 

 longioribus iterum ramulosis, paniculam laxam foliosam formanfîbus. 

 Foiiorum vagina? basales lateialiler compressae, latae, ad 30 cm. longae, 

 superiores praïter partes superiores subteretes, inlernodis breviores, 

 oranes prominenter nervosœ, Iseves; ligula brevissima, truncata, cilio- 

 lata; lamina? e basi in vaginam decurrente sensim longe attenuatœ, 

 acutœ, complicatœ, ad 80 cm. longa?, ad 7 mm. latai, rigidulaî, subglaucse 

 vel rubescentes, praoter margines imprimis apicem versus asperas lœves, 

 Costa acute carinata supra latiuscula subalbida, nervis tenuibus arctis 

 prominulis. Panicula 30 cm. vel ultra longa, ramis ramulisque inferio- 

 ribus distantibus, foliis subtendentibus, laminas angustas gerentibus vel 

 summis spathiformibus lamina destilutis. Racemi fasciculati, pedunculati, 

 pedunculis inœqnalibus, foliis ramorum primariorum superati, subcylin- 

 drici, graciles, slricti, virides, densiflori, 12-20 mm. longi, 1 mm. vix 

 crassiores; articuli t mm. longi, acute triquetri, glabri, larves, ex angulo 

 faciei angustœ opposite appendicuJati, appendicuïo subulato; pedicelli 

 arliculis similes, sed 3 mm. longi, a dorso compressi, ex angulo cum 

 spicula sessili contiguo breviter dentato ex altero superne alato in appen- 

 dicem lanceolatum ad J,5 mm. longum producti. Spiculœ sessiles cum 

 callo brevi lato a reliqua gluma vix distincte 3-3,5 mm. longa?, oblongœ, 

 a dorso valde compressai, imbricata?, glabeiTimœ; gluma inferior coria- 

 cea, carinis a;qualiter vel inœqualiter alatis, alis apice conHuentibus vel 

 in lobos obtusos productis, dorso piano efoveolato, nervis tenuibus 5, 

 flexuris angustis; gluma superior quam inferior paulo brevior, tenuis, 

 oblonga, subacuta, tenuiter 3-nervis, exalata; valva inferior gluraœ supe- 

 riori œquilonga, oblonga, obtusa, tenuiter 2-nervis, vacua; valva superior 

 elliptica, obtusa, tenuis, 1,5 mm. longa, 1-nervis, cum palea aiquilonga 

 subhinervi oblonga subobtusa. Antherae fusco-purpurea?, vîx 1 mm. 

 longœ. Spiculaî pedicellataî sessilibus similes nisi minores, gluma supe- 

 rjore dorso carinata, carina superne alata, valvarum palearumque nervis 

 obscuris vel evanidis; antbœcium superum ut in spiculis sessilibus 

 hermaphroditum. 



Moyen-Niger. — Bammako, cbutes du Soknafi, 20 janvier 1899, 

 n° 232 [Aug. Chevalier], 



