No key was found for the requested taxon, but its parent (Sorghum) is keyed as shown below.

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Key to Poaceae, Key B: robust herbaceous grasses

Poaceae

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1 Inflorescence an array of spike, the spikelet closely imbricate in 2 rows along the rachis of the spike, the spike alternate along the primary inflorescence axis; [tribe Zoysieae; subtribe Sporobolinae]
1 Inflorescence otherwise, either the spikelet embedded or in grooves in an thickened rachis, or the inflorescence a slender or broad panicle.
  2 Spikelet embedded in the thickened rachis (the inflorescence thus like an ear of corn), or fitting into grooves in the thickened rachis (the inflorescence thus cylindrical and resembling a rat's tail). Spikelet unisexual, with male and female spikelet in separate inflorescence or in different parts of the same inflorescence; [tribe Andropogoneae].
    3 Raceme of mixed sex (female below, male above)
    3 Raceme of single sex
 Zea
  2 Spikelet not embedded or fitting into grooves in the rachis, the inflorescence a slender or broad panicle (the spikelet visibly separate and often pedicelled).
      4 Spikelet with a single floret, this unisexual (either pistillate or staminate); plants with aerenchymatous culm, [plants of seasonally or tidally flooded wetlands]; [tribe Oryzeae].
        5 Pistillate spikelet on the upper branches of the panicle, staminate spikelet on the lower branches; lemma and palea clasping along their margin; plants annual
        5 Pistillate and staminate spikelet intermingled on the same branches of the inflorescence; lemma margin free; plants perennial
      4 Spikelet with 2 or more floret, at least some of these bisexual; plants without aerenchymatous culm, [plants of uplands or temporarily to seasonally flooded wetlands].
          6 Spikelet with 2-8 floret, these bisexual.
             7 Leaves primarily basal, plants densely cespitose.
               8 Panicle not plumose; [tribe Arundineae]
               8 Panicle plumose; [tribe Danthonieae]
             7 Leaves cauline; plants short to long rhizomatous, usually somewhat clumped (short rhizomatous to cespitose in Neyraudia).
                 9 Lemma 3-veined, the apices bifid and shortly awned from between the teeth; [tribe Cynodonteae]
                 9 Lemma 3-7 veined, the apices not bifid (instead either unawned, entire, or only minutely awned); plants rhizomatous; [tribe Arundineae]
                   10 Lemma pilose; rachilla glabrous; plants short-rhizomatous (somewhat clumped); culm to 10 m tall; [plants of uplands or saturated or temporarily flooded wetlands]
                   10 Lemma glabrous; rachilla sericeous; plants long rhizomatous; culm to 4 m tall; [plants of uplands or saturated, tidally flooded, or seasonally flooded wetlands]
          6 Spikelet almost always with 2 floret, the lower floret sterile or staminate (sometimes reduced to lemma or completely absent).
                     11 Spikelet falling separately, not attached to rachis segment, stalk, or bristle; spikelet <2× as long as wide; [tribe Paniceae].
                       12 Spikelet (at least the terminal) subtended by 1-many stiff, terete bristle
                       12 Spikelet not subtended by stiff bristle.
                          13 Fertile lemma rugose with cross-venation
                          13 Fertile lemma smooth or hairy, not rugose
                            14 Fertile (upper) floret shiny and black to brown-colored when mature; the glume abruptly apiculate and (internally) oily, the lower glume base saccate; plants erect, arching, climbing, or decumbent; [s. FL only in our flora area]
                            14 Fertile floret not shiny and black when mature; glume apices truncate to acuminate, but not abruptly apiculate (nor internally oily); plants growing variously, but rarely arching or decumbent
                     11 Spikelet falling with attached rachis segment, stalk, or bristle; spikelet >3× as long as wide; [tribe Andropogoneae].
                              15 Pedicelled spikelet differing from the sessile in shape and sex (sometimes represented only by a pedicel).
                                16 Inflorescence of 2-13 digitate (whorled) raceme borne at the summit of a peduncle, the peduncle subtended by a raceme sheath
                                16 Inflorescence a panicle, the branches not subtended by sheath.
                                  17 Pedicelled spikelet represented by pedicel only; apex of sheath bearing 2 auricle 1-10 mm long; [native]
                              15 Pedicelled spikelet similar to the sessile spikelet, both fertile.
                                    18 Spikelet falling separately from the persistent rachis
                                    18 Spikelet falling in pairs together with sections of the disarticulating rachis
                                       19 Spikelet awned with awn 10-26 mm long; anther 2; [native, collectively common and widespread]
                                       19 Spikelet unawned or with awn to 5.2 mm long; anther 3; [exotic, rarely encountered]
                                         20 Spikelet unawned
                                         20 Spikelet with awn 4-5.2 mm long

Key to Poaceae, Key E: grasses of tribe Andropogoneae (also including grasses also keyed in Keys B, C, and D)

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1 Leaves ovate-lanceolate, 2-10 cm long, 2.5-7× as long as wide; plants weak-stemmed annuals, branching, decumbent, rooting at the lower node; [exotic weeds].
  2 Leaves cordate-clasping at base; spikelet awned, not paired, unaccompanied by a vestige; each panicle with 12-20 rame
  2 Leaves tapering to a broadly cuneate base; spikelet unawned, paired (one of the pair sometimes vestigial); each panicle with 1-few rame
1 Leaves lanceolate to linear, either longer or proportionately narrower; plants either perennial or coarse annuals with erect and mostly unbranched culm.
    3 Spikelet embedded in the thickened rachis (the inflorescence thus like an ear of corn), or fitting into grooves in the thickened rachis (the inflorescence thus cylindrical and resembling a rat's tail), or the pistillate inflorescence enclosed in a hard, bead-like, pearly-white, modified bract.
      4 Spikelet unisexual, with male and female spikelet in separate inflorescence or in different parts of the same inflorescence.
        5 Internode narrower than and more-or-less enclosed by the female spikelet
        5 Internode broader than and more-or-less enclosing the female spikelet.
          6 Raceme of mixed sex, female flowers below, and male above
          6 Raceme of single sex, the female inflorescence (“ears”) borne on axillary branches, the male inflorescence (“tassels”) terminal on the culm
 Zea
      4 Spikelet, or at least one of each pair, bisexual.
             7 Culm 2-45 cm tall; leaves 1-5 mm wide; plants perennial, obviously and prominently rhizomatous; lower glume with pectinate margin; [commonly naturalized turf grass and roadside weed]
             7 Culm 30-400 cm tall; leaves 2-25 mm wide; plants annual or perennial, cespitose or short-rhizomatous; lower glume winged or not, but not pectinate.
               8 Lower glume of the sessile spikelet rough, rugose, pitted, tuberculate or alveolate between the keel
               8 Lower glume of the sessile spikelet smooth or scabrous.
                 9 Pedicel at least partially fused to the rame axes
                 9 Pedicel appressed, but not fused, to the rame axes
                   10 Pedicellate spikelet 4-8 mm long
                   10 Pedicellate spikelet 1-3 mm long
    3 Spikelet not embedded or fitting into grooves in the rachis, the rachis slender (the spikelet visibly separate and often pedicelled).
                     11 Pedicelled spikelet similar to the sessile spikelet, both fertile.
                       12 Spikelet falling separately from the persistent rachis.
                          13 Panicle contracted, spikelike; glume membranous
                          13 Panicle loose; glume cartilaginous or coriaceous
                       12 Spikelet falling in pairs together with sections of the disarticulating rachis.
                            14 Spikelet awned with awn 10-26 mm long; anther 2; [native, collectively common and widespread]
                            14 Spikelet unawned or with awn to 5.2 mm long; anther 3; [exotic, rarely encountered]
                              15 Spikelet unawned
                              15 Spikelet with awn 4-5.2 mm long
                     11 Pedicelled spikelet differing from the sessile in shape and sex (sometimes represented only by a pedicel).
                                16 Spikelet awned, the awn 10-20 cm long.
                                  17 First glume lacking gland; panicle open, the branches 5-8 cm long
                                  17 First glume with a row of punctate, concave gland; panicle contracted, spikelike
                                16 Spikelet with or without awn, if awned the awn < 5 cm long.
                                    18 Inflorescence a panicle (false panicle in Hyparrhenia), the branches not subtended by sheath.
                                       19 Inflorescence a false panicle with numerous inflorescence units; peduncle with 2 rame in digitate clusters (1 almost sessile, the other rame stalked and both bearing 7-14 heterogamous spikelet pairs), disarticulation in the rame beneath the bisexual spikelet; spikelet a mix of heterogamous and homogamous pairs; awn of the lemma 1-3.5 cm long; [non-natives]
                                       19 Inflorescence true panicle (with evident rachis); disarticulation beneath the sessile spikelet (or not occurring at all); spikelet only heterogamous; awn of the lemma (5-) 10-40 mm long (when present); [native and non-natives].
                                         20 Pedicelled spikelet represented by pedicel only; apex of sheath bearing 2 auricle 1-10 mm long; awn of the lemma once or twice-geniculate; [native]
                                    18 Inflorescence of 1-13 digitate (whorled) raceme borne at the summit of a peduncle, the peduncle subtended by a raceme sheath.
                                           21 Raceme 1 per peduncle and raceme sheath
                                           21 Raceme 2-13 per peduncle and raceme sheath.
                                             22 Pedicel of the pedicelled (reduced or absent) spikelet terete or slightly flattened and grooved on one side only.
                                               23 Pedicellate spikelet sterile, vestigial or absent; sessile spikelet < 7 mm long
                                               23 Pedicellate spikelet staminate, as large as the sessile, fertile spikelet; sessile spikelet > 7 mm long
                                             22 Pedicel of the pedicelled (reduced or absent) spikelet strongly flattened and with or without grooves on both sides.
                                                 24 Rame internode and pedicel with a translucent medial groove; pedicelled spikelet smaller than the sessile spikelet (or vestigial/absent)
                                                 24 Rame internode and pedicel without a translucent medial groove; pedicelled spikelet ca. the same size as sessile spikelet