428 
CLVII. GRAMINEiE (Stapf). 
[Digitaria. 
Racemes digitate or subdigitate, or if on an elongated 
common axis then longer than it and more or 
less fastigiate ; spikelets f-1 lin. long. 
Nodes bearded; catapliylls and basal sheaths 
tomentose or villous ; racemes numerous, 
mostly 7-10. 
Compactly caespitose, without stolons ; culms 
2-3-noded ; leaves glabrous or sparingly 
hairy except on the lower sheaths ... 26. D. gazensis. 
Forming tufts of barren shoots mixed with 
flowering shoots and trailing runners ; 
culms many-noded, leaves more or less 
villous ' 27. D. Chevalieri. 
Nodes glabrous, 7 or more ; racemes 2-5 ; stolon - 
iferous, with glabrescent catapliylls ; leaves 
sparingly hairy ... ... ... ... 28. D. Hackelii. 
Spikelets glabrous, somewhat turgid ; racemes 2-9, 
digitate or subracemosely arranged with the 
lowest longer than the common axis, oblique; 
rhizome long, creeping ... ... ... ... 29. D. abyssinica. 
Annual. 
Spikelets oblong to lanceolate-oblong, acute, up to 
1 lin. long. 
Nodes bearded. 
Spikelets 1 lin. long, whitish with silvery lines of 
hairs ; racemes 8-15, the lowest usually bare 
at the base ... 30. D. leptorrhachis. 
Spikelets f-f lin. long, greenish or purplish, ap- 
parently glabrous ; racemes usually over 20, 
bearing perfect spikelets from the base ... 31. D. polybotrya. 
Nodes glabrous ; spikelets not quite 1 lin. long, 
greenish or brownish, apparently glabrous ... 32. D. nigritiana. 
Spikelets lanceolate, finely or almost caudate- 
acuminate from the upper glume, 1-1 § lin. long, 
apparently quite glabrous ... ... ... ... 33. D. debilis, 
{g) VERRTTCIPILiE. 
Lower glume a broad white or blue hyaline cuff -like 
persistent scale, equalling a quarter of the spikelet ; 
long-trailing, with short rigid lanceolate blades ... 34. D, maniculata. 
Lower glume very minute, delicate and fugitive or 0. 
Spikelets subacute to acuminate, but never aristulate. 
Spikelets hairy. 
Rhachis of racemes trigonous, up to £ lin. wide, 
with scaberulous angles ; spikelets oblong, 
acute to subacute, over 1 lin. long, whitish-silky 35. D. angolensis. 
Rhachis of racemes flat, winged, with a terete 
smooth midrib. 
Spikelets oblong-lanceolate, acuminate, up to 
over 1 lin. long, silkily shaggy from long hairs 
which are produced beyond the tip of the 
spikelet ... .." ... ... ... 30. D. argyrotricha 
Spikelets elliptic-oblong, subacute to acute, under 
1 lin. long, appressedly silky from short hairs 37. D. longiflora. 
Spikelets glabrous, elliptic-oblong, acute ... ... 38. D. exilis. 
