1	"Lemma ciliate to some degree on margins"	"Vulpia myuros forma megalura"
1	"Lemma glabrous on margins"	2
2	"Upper glume ±twice length of lower glume"	"Vulpia bromoides"
2	"Upper glume 3-4 times as long as lower glume"	3
3	"Lemma with a wide hyaline margin"	"Vulpia fasciculata"
3	"Lemma without a hyaline margin"	4
4	"Inflorescence not fully exserted from uppermost leaf sheath"	"Vulpia myuros forma myuros"
4	"Inflorescence well exserted from uppermost leaf sheath"	"Vulpia muralis"