380 BULLETIN DE L'HERBIER BOISSIER. (84) 



Pennisetum tenuifolium (Subgen. Gymnothrix) HACK. 



Perenne, caespitosuin, culmis innovationibusque basi vaginis vetustis 

 dense tunicatis. Cuirai erecti, graciles, cire. 30-35 cm. alti, subcom- 

 pressi, glaberrimi, 3-Dodes, simplices, alte foliati. Folia praeter os vagi- 

 n83 minute barbatum glaberrimae : vaginae teretes, laxiusculae, inter- 

 nodiis pleruinque longiores; ligula ciliaris; larninae anguste lineares, 

 tenui-acuminatae, siccitatae convolutae, eulmum saepius superantes, 

 20-30 cm. longae basi vix 1 mm. latae, patulae, rigidulae, margine laeves, 

 intus crassinerves. Panicula spieiformis in eulmo solitaria, linearis, 

 densa, 5-7 cm. lg., pallens, subnutans (?), rliachi angulosa scabra, spi- 

 culis ad hujus nodos singulis subsessilibus, involucro multiseto setis 

 tenuissimis scabris inaequalibus, plerisque spiculam subaequantibus una 

 ea duplo longiore. Spiculae lineari-lanceolatae 4-5 mm. longae, glabrae : 

 gluma I raa hyalina, spicula 5-plo brevior, late ovata, acuminata, 1-ner- 

 vis ; II da mediam spiculam aequans, ovato-lanceolata, acuminata, mucro- 

 nata, 1-nervis, hyalina ; ÜI a spiculam aequans, late lanceolata, acumi- 

 nata, mucronata, membranacea, 3-nervis, vacua; IV a spiculam aequans, 

 late lanceolata, acuminata, mucronata, subchartacea, 7-9 nervis; palea 

 huic similis, acuta, 2-nervis. 



Transvaal : Pretoria ad Wanderboompoort (Rehin. 4490). 



Affinis P. Schimperi Höchst., quod vero differt rigiditate, foliis jun- 

 ceis subpungentibus, scabro-hirtulis, eulmo superne pubescente, gluma 

 IV a 3-5-nervi, etc. 



Aristida speetabilis (Sect. Ch^etaria) HACK. 



Perennis, caespitosa, robusta fere arundinacea, tota glaberrima. 

 Culmi circ. 1,5 m. alti, teretes, simplices. Vaginae in eulmi basi dense 

 fiabellato-aggregatae, teretes, aretae, internodia superantes. Ligula 

 ciliaris, brevis. Laminae elongato-lineares, setaeeo-aenminatae, ad 60 cm. 

 longae, basi 4-5 mm. latae sed siccitate involutae, glaucae, supra crassi- 

 nerves. Panicula speetabilis, circ. 35 cm. longa, oblonga v. ovata, 

 nutans (?), laxiuscula, patens, rhachi laevi, ramis binis ad 20 ein. usque 

 longis mox supra basin repetite ramulosis, ramulis multispiculatis, sca- 

 berulis, ultimis capillaribus hVxuosis. Spiculae pedicello ipsas aequanti 

 v. superanti capillari valde curvato fultae, lineares, stramineae : gluma? 

 steriles subaequalcs, 10 mm. longae, lineari-lanceolatae, acutissimae, 

 apice hyalino saepius irregulariter lacinulatae, 1-nervcs, laeves; gluma 



