AL'G. CHEVALIER. NOVITATES FLOR.E APKICAN.-E. 99 



L 



Urelytrum Hack. 



Urelytrum annuum Stapf. 



Affine U. squarroso^ Hack. sed differt duralione, rhachis arliculis 

 utrinque albo-barbatis cicterum glaberrimis, appendice 2-3 mm. longo 

 eciliolato, gJuma inferiore spiculœ sessilis callo barbato exceplo glaber- 

 rima, dorso supra médium 2-sulGata b-nervl, nervis binis exterioiibus 

 valde approximalis extimo muricato, arista spicula; pedicellatjR ad 4 cm. 

 longa. 



Gramen annuum, l-i,5 m. altum, glaberrimum. Gulmî erecti, graciles, 

 4-5-nodi, ramosi ramis erectis, teretes vel internodia ramis contigua uno 

 latere applanata vel excavata, partibus exserlis sajpe purpurascentibus. 

 Foliorum vagina* arctaj, teretes, larves, prominule-striata); laminœ anguste 

 lineares, longe setaceo-acutatœjUltraSO cm. longac, 3 mm. latoi, flexuosœ, 

 tenues, magis minusve explanala), utrinque asperae, nervis secundariis 

 utrinque 2, tertiariis pluribus tenuibus interjeclis. Racemus pedunculo 

 longo suffultus, 10-12 cm. longus, luride viridis, rigidulus, ad articula- 

 tiones sericeo-barbatus, caeterum glaber; articuli 4-îï mm. longi, basi et 

 apice sericeo-barbati, appendice 3 mm. longo, 3-denlato. Spicula sessilis 

 circiter 6 mm. longa, glabra; gluma inferior lanceolata, obtusa, basi 

 paulo contracta, supra médium in dorso 2-sulcata, in sulcis magis 

 minusve fûsca, caîterum pallide viridis, carinis praeter basin sublœvem et 

 apicem ciliolatum muricatîs, callo ïaevi, nervis 5, exterioribus binis arcte 

 approximatis; gluma superior ianceolata, acuta, navicularis, carina 

 superne ciliolata, lateribus hyalinis molliter ciliatis, nervis 3 exterioribus 

 submarginalibus; valva inferior Ianceolata, acutissima, 4-o mm. longa, 

 hyalina, apicem versus molliter ciliala, 2-nervis cum palea simili et sta- 

 minibus 3; valva superior inferiori similis, sed 3-nervis, cum palea 

 3-4 mm. longa hyalina. Spicula pedicellata, pedicello applanato glabro 

 5 mm. longo; gluma inferior Ianceolata, 3 mm. longa, in aristam basi 

 compîanatam 10-12 mm. longam squarrosam attenuata, tenuiter 3-nervis, 

 carinis superne rigide-cilioialis, caetera ut in spicula sessili nisi Oos 

 superior etiam mas. Antherai fere 4 mm. longa*. Garyopsis oblonga, stra- 

 minea, 4 mm. longa, embryotegio albido caryopsin mediam ;i .juante, 

 hilo punctiformi obscuro. 



Moyen-Niger. — Koulikoro, G-14 oct. 1899. u" i2887 [Awj. Chevalier], 



Rhytachne Desv. 



Rhytach 



Affinis R. gabonensi Hack., statura gigantea, ghima spiculœ sessilis 

 inferiore exaristulata minute vel vix muricata, spicula pedicellata per- 



fecta aristata distincta. 



. Culmi teretes, inferne ultra 



orum vaginae 

 mullistrialœ, 



superne magis minusve liirsuta; vel hirriulo-tumciitosy; ligvila truncutu, 

 ad 3 mm. longa, scariosa, ciliata, inlus pilis slipata; lamiii;»- longlssiiue 

 tenuilerque angustataî, ad \ m. longa;, supra basin paulo angustatam ad 

 3 cm. lataj, planae, rigidai, subtus secundum costam validam hirsutœ, 



