A2V

no A2V dagger type, but Iota Cen (HD 115892) could be (see below)

Gray87 claims that the MK A2 is really halfway between A0 and A3
daggers, so they shuffle the early As a bit. Gray87's standards
are HD 88955 (A2Va) and HD 56405 (A2Van).

MK43 lists Eta Oph as their A2V standard. 

Cowley69 used Tet And, Tet Leo, Zet UMa, & 26 UMa as A2V standards.

Garrison79 used Tet Leo as their A2V standard. 

Skiff08 flagged HD 23948 (MK78) as the only A2V standard. 

Mean B-V[A2V] = 0.061, hence again Iot Cen seems representative of the type

Gray01/03/06 list 5 nearby A2Vs. Their median HIP colors:
<B-V>(A2V) = 0.075 (+-0.019 sem, +-0.036 stdev; N=5)
<V-I>(A2V) = 0.048 (+-0.028 sem, +-0.055 stdev; N=5)


# No Standard
Morgan65, Houk, MK73, and GrayAtlas do not list a A2V standard

# Candidate Anchor
HD 115892 = iot Cen (B-V[HIP] = 0.068+-0.004)
  A2V: Cannon18(A2),deVauc57,Levato72,Jaschek78,Houk82,Gray87(Va),Garrison96(A2Va) 

  *all* spectral types (in Skiff07 and
  otherwise) for this object are "A2", so this could probably be
  considered a standard (Houk type = Gray type.

# Primary Standards
HD 88955 = HR 4023
  A2V: Gray87(stan),Cannon(A2),Levato72,deVauc57
  A1V: Houk78(overexp,from Garrison)
  all the Skiff07 types are "A2V" or "A2Va". Probably good standard. 
  B-V[HIP] = 0.051+-0.005

HD 56405 = HR 2758 = HIP 35180
  A2Van: GrayGarrison87
  A2V: Abt95
  A2Vnp: Hoffleit91(BSC)
  A2: Cannon
  A3V: Jaschek78(Cowley69)
  A1V: Houk88
  par(HIP2) = 12.12+-0.40 mas, Blackwell98 Teff=8721

# Weak Standards
HD 155125 = eta Oph
  A2V: MK43,Jaschek64(most),Cowley69,Cannon(A2)
  A2IVs: Abt81
  A2IV: Abt95
  A2.5VA: Houk88
  A2Va+((Sr)): GrayGarrison87(non-stan)
  A1V+A3V: Edwards76
  0.4" tight binary. 

HD 23948 = Cl Melotte 22 2488 
  A2V: MK78,Keenan85
  A1Va: GrayGarrison87

HD 97633 = Tet Leo = 70 Leo = HR 4359
  A2V: JM53,Cowley69(stan),Garrison79(stan)
  A2IV(k var): GrayGarrison87

Zet Lep
  A2Vann: Cannon(A2),Houk88(Garrison),Garrison96,GrayGarrison87(A2Van)
  A3V: Slettebak54,Jaschek64(most),Jaschek78(A3Vn,Cowley69),Abt95(A3Vn)
  Jaschek64 shows 9 A3V refs and 1 A2IV ref.
  Split A2V and A3V - inappropriate as candidate standard

HD 1280 = tet And = 24 And = HR 63 
  A2V: Cannon(A2),JM53,Jaschek64(all),Cowley69(stan),Jaschek78(JM53),Garcia89,Hoffleit91
  A2IV: GrayGarrison87(A2IV-),Abt95
  1.25 mag above main sequence, so probably IV
  At least everyone agrees on A2 subtype

Eps Gru
  A2V: Cannon(A2),Garrison96(A2Va),Abt95(A2Vn),GrayGarrison87(A2Va)
  A3V: Jaschek78(Levato72),Houk78(from Garrison)
  Jaschek64 has 4 for A2V and 2 for A3V
  Split A2V and A3V - inappropriate as candidate standard

HD 106591 = Del UMa 
  A3V: MK43, Jaschek64(all),Jaschek78(JM53)
  A2Vn: Gray03,Abt95,GrayGarrison87(A2Van),Cannon(A2)
  Migrated from A3V (MK/JM53) to A2V (Gray/Garrison/Abt) - probably not good standard

HR 2534
  A2:V:kn((SrII)) : MK78
  Why is a star with colons after the subtypes listed as a "standard" ?

HD 82621 = 26 UMa = HR 3799 = HIP 47006 
  A2V: Slettebak54,Jaschek64(all),Cowley69(stan),Jaschek78(Morgan53), 
  A0: Cannon
  A1Va: GrayGarrison87
  A0Vn: Abt95
  Was A2V under Morgan, but has moved to A0/A1 by Gray/Garrison and Abt.

HD 116656 = Zet UMa = Mizar 
  A2V: MK43,Cowley69(stan)
  A1VpSrSi: Abt81
  A1.5Vas: Gray03
  A1Va+((Si)): Gray87
  binary, probably not standard material. MK43 lists "Zeta UMa br." as the A2V standard. 

HD 6288 A = HR 301 A = HI 4979 = 26 Cet
  A2V: Abt68
  A8IV: Houk99
  A8V: Wilson50
  F1V: Cowley74,Abt95
  A7III:: Cowley76
  F0: Cannon
  F0V: Adams35
  
  Abt68 showed "HR 301A" as an A2V star, but it is much later in all
  other publications, including being listed as F1V in Abt95! This
  must be a typo? Houk notes: "HR 301; 26 CET; UNDETECTED VISUAL
  DOUBLE p=254°d=16.0arcsec MAGS 6.11, 9.52". Not a good standard.