178 
It might perhaps be observed that to a grass with weak 
decumbent stems the attachment of the leaf blades by a very 
narrow base to their slender petioles is probably of great advan- 
tage with regard to leaf movement. There are, moreover, at the 
bases of the leaf blades and of the petioles cushions of paren- 
chyma which are possibly capable of heliotropic or, like those of 
the culm nodes, geotropic movement. It would be interesting te 
see the results of experiments made in this direction. 
Streptolophus Hughes [Gramineae-Cenchrastrae] gen. nov. 
affinis Cenchro Linn., sed glomerulis distincte petuncolats 
involucro imperfecto setis ramosis constituto differt 
Spiculae sessiles vel subsessiles in glomerulos laxe paniculatos 
tandem reflexos demum deciduos setis ramosis imperfecte involu- 
cratos dispositae. Glumae subaequales, paucinerves, membrana- 
ceo-hyalinae, spicula multo breviores. Anthoecium inferum ad 
valvam herbaceo-membranaceam spiculam aequantem reductum. 
Anthoecitum superum 3 :. valva membranacea paulo indurata; 
valvula valvam aequans. Lodiculae 2, minutissimae. Stamina 3. 
Ovarium glabrum; styli longi, terminales : stigmata plumosa, 
brevia, ex apice spiculae exserta. Gramen annuum, vagans ; 
foliorum laminae sagittatae, petiolatae, vernatione convolutae ; 
higulae elongatae, membranaceae. Panicula angusta, composita, 
ramis primariis glomeruliformibus, infimis uti axis primarius in 
spicam brevem apice seta terminatam elongatis; glomeruli com- 
positi, secundarii spiculas 2-1 setis (ramulis commutatis) basin 
versus confluentibus quasi involucro suffultas et supra eas setarum 
sterilium comam gerentes. 
Species unica, Angolensis. 
S. sagittifolius Hughes. Gramen profuse vagans ad 2 m. altum. 
- Culmi decumbentes vel geniculato-ascendentes, iterum ramosi, 
multinodes, nodis exsertis sparse pubescentibus. Folia ubique 
leviter retrorsum scabrida; vaginae solutae ad margines osque 
longe ciliatae, nervis prominentibus striatae; ligulae usque ad 
2mm. longae;. petioli usque ad 5 cm. longi, apice dense pubes- 
centes; laminae e basi sagittata Janceolatae, apice longe 
attenuatae, 9-10 cm. longae, 1-5-2 cm. latae, subtus sparse 
pubescentes. Inflorescentia exserta, sicher 12 em. longa, 2-3 em. 
lata, ramis (glomerulorum pedunculis) usque ad 3 cm. longis. 
Glomeruli 0-5-1-5 em. longi anthesi virides, mature fusci vel 
piikaeiretistineed setae involucri demum induratae reflexae, comae 
erectae vel oblique patentes. Spiculae ovato-lanceolatae, 3-5 mm. 
longae. Glumae rotundatae, hyalinae, apice papillosae; inferior 
enervis, 0-6 mm. longa; superior sub 3-nervis, 1 mm. longa. 
Valva inferior 5-nervis, viridis, seaberula. Valva superior ovato- 
lanceolata, subpruinosa. Antherae 2 mm. longae. Stigmata 
exserta, 1-5 mm. —_— Caryopsis late oblonga, 2 mm. —— 
dorso leviter compress 
