* SUDD "-FORMATION OF THE UPPER NILE. 57 
Ottelia ulveefolia, Walp. 
Commelina nudiflora, Linn., cum var. 
Pistia Stratiotes, Linn. 
Lemna sp. 
Potamogeton aff. pectinato, Linn. 
Cyperus Schimperianus, Schrad. 
C. dichrostachys, Hochst. 
C. latifolius, Poir. 
C. nudicaulis, Poir. 
C. articulatus, Linn. 
Marsilea diffusa, Lepr. 
Azolla nilotica, Decne, 
(d) Plants growing on low, periodically inundated land. 
[Norr.—The trees the names of which are printed in small capitals are 
often found growing in the midst of the Sudd, and, although now 
probably fixed, may originally have started growing on the masses 
of floating vegetation.) 
Capparis micrantha, Rich. Shrub (scrambling), 
C. Rothii, Oliver. Shrub. 
CRATJEVA RELIGIOSA, Forst. Tree. 
Malachra radiata, Linn. Herb. (Mouth of Bahr el Zeraf.) 
Harrisonia abyssinica, Oliver. Shrub. 
Trichilia emetica, Vahl. "Tree. 
ZEschynomene aspera, Linn. Shrub. 
Indigofera orthocarpa, Baker. Undershrub. 
Sesbania egyptiaca, Pers. Shrub. 
S. aculeata, Pers. Herb. (Bahr el Ghazal.) 
Psophocarpus longepedunculatus, Hassk. Herb; climber. 
Canavalia ensiformis, DC. Herb; climber. 
ACACIA SEYAL, Del. Tree. 
A. Suma, Kurz (syn. A. campylacantha, Hochst.). Tree. 
A. verugera, Schweinf. Tree. 
- Combretum sp. (near aculeatum, Vent.), Scrambling shrub. 
Mollugo Spergula, Zinn. Herb. 
Mitragyne africana, Walp. Tree. (On termite-hills, Bahr el Ghazal,) 
Oldenlandia sp. (near decumbens, Hiern). Herb. 
Enhydra fluctuans, Zour, Creeping herb. 
Ethulia conyzoides, Zinn. Herb. (Mouth of Bahr el Zeraf.) 
Marsdenia rubicunda, N. E. Br. Woody climber. 
Cordia abyssinica, R. Br., var. Shrub. 
C. subopposita, DC. Shrub or small tree. 
Withania somnifera, Dun. Herb. 
Kigelia æthiopica, Deene. Tree. 
Asystasia coromandeliana, Nees. Herb. 
