Digitaria

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  D. cognata

  1a. Inflorescence an open panicle, the primary branches usually branched again [Fig. 216]; spikelets borne on pedicels 10–40 mm long
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  1b. Inflorescence a panicle of secund, spike-like racemes, the primary branches usually unbranched [Fig. 217]; spikelets borne on pedicels 0.2–3.8 mm long
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    D. filiformis

    2a. Axis of panicle branches triquetrous, but not wing-margined; reproductive stems usually upright, only rarely rooting at the lower nodes
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    2b. Axis of panicle branches wing-margined; reproductive stems usually decumbent and rooting from the lower nodes
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      D. sanguinalis

      3a. Lower glume present, 0.2–0.4 mm long; upper glume 33–50 (–60)% as long as the entire spikelet; upper lemmas yellow or gray to brown at maturity; spikelets of the middle portion of the primary panicle branches usually borne in pairs on pedicels 
that are not adnate to the branch axis; leaf sheaths usually pustulose-pubescent
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      3b. Lower glume absent or a veinless, membranous rim; upper glume (50–) 75–100% as long as the entire spikelet; upper lemmas dark purple-brown at maturity; spikelets of the middle portion of the primary panicle branches usually borne in trios on pedicels that are adnate to the branch axis (at least the longer pedicels of each cluster); leaf sheaths glabrous over the surface (rarely pubescent, the upper margins sometimes ciliate)
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        D. ischaemum

        4a. Spikelets 1.7–2.3 mm long; plants with axillary panicles, these often concealed in the leaf sheaths
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        D. violascens

        4b. Spikelets 1.2–1.7 mm long; plants without axillary panicles

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