1	"Spikelets solitary at each node of the rachis"	2
1	"Spikelets 2 or more at each node of the rachis"	9
2	"Spikelets unawned, sunk into the rachis and closely appressed to it, with 1-2 florets; glumes lying side by side, concealing the florets; lemmas thin, membranous"	Henrardia
2	"Spikelets awned or awnless, not sunk into the rachis, from lightly appressed to it to clearly diverging; glumes facing eah other, frequently exceeded by the upper florets; lemmas herbaceous to coriaceous"	3
3	"Spikelets dimorphic, fertile spikelets hairy and warty, sterile scale-like"	Heteranthelium
3	"Spikelets all alike or the upper ones reduced or abouted"	4
4	"Spikelets with 2-florets; lemma keels prominently pectinate-ciliate; glumes subulate"	Secale
4	"Spikelets with more than 2 florets; lemma keels not pectinate-ciliate; glumes not subulate"	5
5	"Lemma veins not converging at the tip; plants annuals"	6
5	"Lemma veins convering towards the tip; plants annual or perennial"	7
6	"Glumes and lemmas keeled on the back; lemmas and paleas not firmly enclosing the caryopses at maturity, easily removed by threshing; plants cultivated or escaped from cultivation"	Triticum
6	"Glumes and lemmas rounded on the back; lemmas and paleas firmly enclosing the caryopses at maturity, not removed by threshing"	Aegilops
7	"Rachises breaking up at maturity"	Eremopyrum
7	"Rachises not breaking up at maturity"	8
8	"Glumes boat-shaped, keeled; spikelets divergent at maturity"	Agropyron
8	"Glumes not boat-shaped, rounded on the back; spikelets lightly appressed to the rachis (Elymus sensu lato)"	Elymus
9	"Spikelets with 1 floret, the rachilla produced and bearing a second, rudimentary floret"	10
9	"Spikelets usually with 3-5 florets"	11
10	"Spikelets 2 at each rachis node, both spikelets fertile"	Taeniatherum
10	"Spikelets 3 at each node, only the central spikelet fertile in wild species"	Hordeum
11	"Rachises breaking up at some nodes maturity; plants sterile"	"× Elyhordeum"
11	"Rachises not breaking up at any nodes maturity; plants fertile"	12
12	"Glumes subulate, 1-veined; lemma awns not more than 3 mm long"	Leymus
12	"Glumes wider, with 3 or more veins (Elymus sensu lato)"	Elymus