Bentham's treatment of the Hordeeae.  I have modified spelling and endings to reflect contemporary practice.  The information comes from: Bentham, G.  1882.  Notes on Gramineae.  Bot. J. Linn. Soc. 18:14-1134.  Genera in red are still included in the tribe.  Bentham differed from Hackel  in including both Haynaldia and Heteranthelium in Agropyron.

Subtribe Genus Size and Bentham's comments Comment
TRITICINEAE Spikelets have 3 or more florets and are solitary at each node
  Lolium ?3-4, does not commit himself Now in different tribe, Poeae
  Agropyron about 20; has 2 or 3 sections [not clear] Includes species with connivent lateral glume veins; now reduced to crested wheat grasses.  No agreement as to how many species.
  Secale 2; spikelets have only 2 flowers Recent treatment (Frederksen and Petersen) in full agreement
  Triticum "excluding Agropyron and including Aegilops can scarcely reckon more than 10 species" Mosst of those actively working with Triticum and Aegilops prefer to treat the two as separate genera.   Recent work (van Slageren) has 22 species of Aegilops (and one in Amblyopyrum that some would keep in Aegilops).  Triticum?  20-30 species
LEPTURINEAE Slender spikes, each with only one, rarely 2, flowers
  Lepturus 6 species None of these genera are included in the Hordeae nowadays.
  Psilurus 1 species
  Nardus 1 species "the position of which in the system is rather puzzling" [a statement that is still true]
  Kralika 1 species, Algerian
  Oropetium 1 species, East-Indian
ELYMINEAE Spikelets two or more at each node, sessile or the lateral spikelets very shortly stipitate
  Hordeum 12 No change in circumscription; number of species 32  (Bothmer et al.)
  Elymus 20 Changed in circumscription and number of species
  Asprella [=Hystrix] 3 Questions as to circumscription; as traditionally circumscribed, 6 species
  105 species, as tribe is now interpreted 150-200 species