1	"Leaves smelling of lemon oil or citronella, the sheaths without glandular depressions on the keel; plants perennial, not reaching reproductive maturity in the Flora region when grown outdoors"	Cymbopogon
1	"Leaves usually not aromatic or, if aromatic and smelling of citronella, the sheaths with glandular depressions along the keel and plants annual; plants reaching reproductive maturity in the Flora region"	2
2	"All spikelets unisexual, the pistillate and staminate spikelets in separate inflorescences or the pistillate spikelets below the staminate spikelets in the same inflorescence"	3
2	"Some spikelets bisexual (usually the sessile or more shortly pedicellate spikelet of each spikelet pair or triplet)"	5
3	"Pistillate spikelets completely concealed within a hard, globose, beadlike structure (a modified leaf sheath) from which the staminate rames protrude"	"Coix {Coix lacryma-jobi}"
3	"Pistillate spikelets exposed or enclosed by 1 or more subtending leaf sheaths and a hyaline prophyll; staminate spikelets either distal on the same branch or in a separate inflorescence on the same plant"	4
4	"Staminate and pistillate spikelets in the same inflorescence and on the same branch, the staminate spikelets distal to the pistillate spikelets"	Tripsacum
4	"Staminate and pistillate inflorescences usually separate; staminate inflorescences terminal on the culms and branches; pistillate inflorescences terminal on axillary peduncles, sometimes aggregated in false panicles"	Zea
5	"Spikelets apparently solitary and sessile, the pedicellate spikelets absent; pedicels absent or present"	6
5	"Spikelets in sessile-pedicellate orunequally pedicellate pairs or triplets, the pedicellate spikelets often smaller than the sessile spikelets, sometimes rudimentary"	8
6	"Culms decumbent, scrambling; leaf blades ovate to ovate-lanceolate; pedicels absent or shorter than 3 mm"	"Arthraxon {Arthraxon hispidus}"
6	"Culms erect; leaf blades lanceolate to linear-lanceolate; pedicels always present, usually longer than 3 mm"	7
7	"Inflorescences terminal and axillary, composed of digitate clusters of 1-13 rames on a common peduncle; peduncles subtended by, and often partially included in, a modified leaf"	Andropogon
7	"Inflorescences terminal, with elongate rachises and brancheswith several to many rames; peduncles and branches not subtended by a modified leaf"	Sorghastrum
8	"Pedicels strongly appressed or fused to the thick rame axes, or the rames with only 1 spikelet unit, this a triplet with 2 unequally pedicellate spikelets; bisexual spikelets usually unawned; inflorescences of rames"	9
8	"Pedicels free; rame or branch internodes slender, sometimes thickened distally; bisexual spikelets usually awned; inflorescences of rames with the spikelets in sessile-pedicellate pairs or of non-disarticulating branches with the spikeletsin unequally pedicellate pairs"	17
9	"Lower glumes of the sessile spikelets rugose, pitted, tuberculate, or alveolate or the keels winged or with spinelike projections at the base"	10
9	"Lower glumes of the sessile spikelets smooth or scabrous, not sculptured, the keels without spinelike projections"	13
10	"Keels of the lower glumes with spinelike projections on the base, sometimes winged distally, the surface between the keels smooth; spikelets unawned"	Eremochloa
10	"Keels of the lower glumes winged throughout or not winged, the surface between the keels rough, rugose, pitted, tuberculate, or alveolate; spikelets unawned or awned"	11
11	"Sessile spikelets awned"	Ischaemum
11	"Sessile spikelets unawned"	12
12	"Plants perennial; sessile spikelets ovate, the lower glumes smooth, rugose, or pitted"	Coelorachis
12	"Plants annual; sessile spikelets hemispherical, the lower glumes alveolate"	"Hackelochloa {Hackelochloa granularis}"
13	"Inflorescences false panicles; individual rames to 1 cm long, with 1 spikelet unit; spikelet units composed of 1 sessile and 2 unequally pedicellate and dissimilar spikelets"	"Apluda {Apluda mutica}"
13	"Inflorescences usually solitary rames, sometimes with 2 rames in a digitate cluster; individual rames 2-15 cm long, with more than 1 spikelet unit; spikelet units composed of sessile pedicellate pairs, the pedicellate spikelets often rudimentary or absent"	14
14	"Pedicels appressed, but not fused, to the rame axes"	15
14	"Pedicels at least partially fused to the rame axes"	16
15	"Pedicellate spikelets 1-3 mm long"	Coelorachis
15	"Pedicellate spikelets 4-8 mm long"	Elionurus
16	"Plants perennial; sheaths mostly glabrous, sparsely ciliate basally"	"Hemarthria {Hemarthria altissima}"
16	"Plants annual; sheaths with stiff, papillose-based hairs 1-3 mm long"	"Rottboellia {Rottboellia cochinchinensis}"
17	"All spikelet units homogamous, frequently also homomorphic"	18
17	"All or most spikelet unitsheterogamous, usually also heteromorphic, sometimes the proximal units on the rames or racemes homomorphic and homogamous"	24
18	"Terminal inflorescences a single rame or a digitate or subdigitate cluster of rames"	19
18	"Terminal inflorescences with elongated rachises"	20
19	"Terminal inflorescences a digitate or subdigitate cluster of (1)2-6 rames; rames 3-7 cm long"	Microstegium
19	"Terminal inflorescences solitary rames; rames 2-3 cm long"	"Polytrias {Polytrias amaura}"
20	"Spikelets in unequally pedicellate pairs; disarticulation below the glumes, the branches remaining intact at maturity"	21
20	"Spikelets in sessile-pedicellate pairs or triplets; disarticulation in the rames, below the sessile spikelets"	22
21	"Spikelets usually awned; inflorescence branches usually 7-35 cm long"	Miscanthus
21	"Spikelets unawned; inflorescence branches 1-7 cm long"	Imperata
22	"Culms to 100 cm tall, often decumbent and straggling; terminal inflorescences composed of 2-6 subdigitately to racemosely arranged rames"	"Microstegium {Microstegium vimineum}"
22	"Culms 40-600 cm tall, erect; terminal inflorescences panicles, with more than 6 primary branches; branches usually with 2 or more rames"	23
23	"Panicle branches alternate, with multiple rames; rames with more than 5 spikelet units"	Saccharum
23	"Panicle branches subverticillate, with 1-3 rames; rames with 2-5 spikelet units"	"Spodiopogon {Spodiopogon sibiricus}"
24	"Terminal inflorescences with elongated rachises"	25
24	"Terminal inflorescences and individual inflorescence units without elongated rachises, composed of 1-13 rames, or a raceme in which disarticulation occurs below the pedicellate spikelets"	27
25	"Rame internodes and pedicels with a translucent median line"	Bothriochloa
25	"Rame internodes and pedicels without a translucent median line"	26
26	"Sessile spikelets terete or laterally compressed, calluses usually sharp, sometimes blunt"	Chrysopogon
26	"Sessile spikelets dorsally compressed, calluses usually blunt, sometimes sharp"	Sorghum
27	"Inflorescences composed of rames, disarticulation being in the rame axes; rame internodes and pedicels with a translucent median groove"	Bothriochloa
27	"Inflorescences composed of rames, with disarticulation in the axes or a spikelike raceme (occasionally of 2 subdigitate spikelike branches) with disarticulation below the pedicellate spiklets; inflorescence internodes and pedicels without a translucent median groove"	28
28	"All spikelet units in the inflorescence heterogamous"	29
28	"Basal spikelet units on each rame homomorphic and homogamous, sterile or staminate, unawned"	31
29	"Disarticulation occurring below the pedicellate spikelets, not in the inflorescence axes; pedicellate spikelets bisexual and awned, awns (4)6-15 cm long, pilose on the column, the hairs 1-2 mm long; sessile or subsessile spikelets staminate or sterile, unawned"	"Trachypogon {Trachypogon secundus}"
29	"Disarticulation occurring below the sessile spikelets, in the inflorescence axes; pedicellate spikelets staminate, sterile, rudimentary, or absent, unawned or with awns to 6 mm long; sessile spikelets bisexual or pistillate, awned"	30
30	"Rames usually solitary on the peduncles, occasionally 2; rame internodes cupulate or fimbriate distally; lower glumes of the sessile spikelets veined between the keels"	Schizachyrium
30	"Rames usually 2-13 on the peduncles, occasionally solitary; rame internodes neither fimbriate nor cupulate distally; lower glumes of the sessile spikelets usually without veins between the keels"	Andropogon
31	"Awns 5-15 cm long; rames with 3-10 homogamous spikelet units"	Heteropogon
31	"Awns 1-5(19) cm long; rames with 1-2 homogamous spikelet units"	32
32	"Inflorescences terminal on the culms, axillary inflorescences not present or few in number"	Dichanthium
32	"Inflorescences terminal and axillary, axillary inflorescences numerous"	33
33	"Homogamous spikelets distinctive, forming an involucre around the rame bases"	Themeda
33	"Homogamous spikelets not distinctive, not forming an involucre around the rame bases"	Hyparrhenia