1	"Synflorescence branches stiffly radiating, plumose below, without spikelets on the proximal half"	"Digitaria pennata"
1	"Synflorescence branches not stuffly radiating, not plumose below, bearing spikelets to the base"	2
2	"Spikelets regularly in groups of 3"	3
2	"Spikelets in pairs"	6
3	"Upper glumes exceeded by the florets; upper lemmas exposed, 3-veined; fruit dark brown; spikelet hairs clavate"	"Digitaria ternata"
3	"Upper glumes equalling the florets, concealing the upper lemmas; upper lemmas 5-veined; fruit pallid to brown; spikelet hairs verrucose"	4
4	"Spikelets (1.5-)2.4-2.9 mm long, covering in copious soft hairs extending up to 1.5 mm beyond the tip"	"Digitaria argyrotricha"
4	"Spikelets 1-1.8 mm long, at most pubescent"	5
5	"Plants annual or short-lived perennials, without rhizomes, erect or prostrate and creeping"	"Digitaria longiflora"
5	"Plants perennial, rhizomatous"	"Digitaria brunoana"
6	"Plants perennial"	7
6	"Plants annual"	11
7	"Spikelets completely glabrous"	"Digitaria abyssinica"
7	"Spikelets pubescent to villous"	8
8	"Synflorescences with a straight central axis much longer than the branches"	"Digitaria rivae"
8	"Synflorescences digitate or subdigitate"	9
9	"Veins of the lower lemmas scabrous, often also with stiff, glassy bristles; branch axes narrowly winged"	"Digitaria milanjiana"
9	"Veins of the lower lemmas smooth; branch axes 3-sided, not winged"	10
10	"Nodes shortly pilose to villous"	"Digitaria macroblephara"
10	"Nodes glabrous"	"Digitaria nodosa"
11	"Veins of the lemmas scabridulous; upper glumes 1/3 - 1/2 the length of the spikelets"	"Digitaria velutina"
11	"Veins of the lemmas smooth"	12
12	"Synflorescence branches delicate, diverging from a central axis, this seldom longer than the longest branch; spikelets loosely imbricate, 1.5-2.1 mm long"	"Digitaria velutina"
12	"Synflorescence branches digitate or with a very short central axis; spikelets closely imbricate, 2.5-3.3 mm long"	"Digitaria ciliaris"