F2V

HD 113139 = 78 UMa is the F2V dagger (Garrison94)

Cowley69 used Sig Boo, & 78 UMa & Kap Boo as F2V standards. 
Cowley74 and Cowley76 used Sig Boo & 78 UMa as F2V standards. 

Skiff08 flags one stars as F2V MK standard: HD 113139 (MK78)

Morgan65 classified two Hyads as F2V or variant: HD 26015 & HD 26911. 

Abt68 and Corbally86 used HD 113139 as their F2V standard, while
Abt68 also showed HR 66 as a F2V. 

Gray01/03/06 lists 31 F2V stars. Their median colors:
<B-V>(F2V) = 0.374 (+-0.005 sem +- 0.027 stdev; N=31)
<V-I>(F2V) = 0.437 (+-0.005 sem +- 0.033 stdev; N=31)

# No standard
Morgan65 does not list an F2V standard

# dagger standards
HD 113139 = 78 UMa 
  F2V: MK43,JM53,Abt68,Cowley69(stan),MK73,MorganAbt73,Cowley74(stan),Cowley76(stan),MK78,Keenan85,Corbally86(JM53),Gray89,Garrison94,GrayNstars
  No Houk type

# Weak Standards
HD 128167 = sig Boo = HR 5447 
  F2V: Adams35,MK43,JM53,Jaschek64(all),Cowley69(stan),Cowley74(stan),Houk(?; not in catalog, is it a standard?)
  F3Vvw: Jaschek78(Barry70)
  F4V kF2 mF1: Gray01
  hF3 gF0 mF0: Jaschek89
  F5V: Bouw81

HD 129502 = mu Vir = HR 5487
  F2V: Gray89,GrayGarrison89,Houk99(from_Garrison89),Gray01(H-lines F5),GrayNstars
  F2III: Malaroda75,Jaschek78
  F4Va: Barry70
  F3IV: Slettebak55,Adams55(F3IV-V)
  F5III: Roman50
  F5: Cannon
  Gray considers the star a standard, however the SpT floated a bit before 1989
  dMv = -0.54, so a bit above the MS, B-V = 0.385 -- a bit red
 
Kap Boo B = HD 124674 = ADS 9173B
  F2V: Slettebak63,Cowley69(standard!),Gray01,
  F1V: Adams35,Cowley69(Table 1!),Abt81
  F3V: Levato78
  F3/5IV/V: Berger62
  F5/6IV: Berger58
  Cannon: A5
  Jaschek64 has 5 F2Vs and one F0V
  Companion to A8IV star HD 124675 at 14" separation. 
  Abt says B is the F2V star, while A (HD 124675) is the A7IV (Slettebak63).  
  Cowley69 classifies binary as F1V and A9IV, but calls "Kappa Boo" its
  F2V standard. Strange. 

HD 1343 = HR 66 = HIP 1402 (J0017-1903)
  F2V: Abt68,Abt95(F2Vs)
  F3V: Houk88
  F4V: Appenzeller67
  F4IV-V: Cowley74
  F0IV-V: Malaroda75
  F0: Cannon
  Little agreement among authors. Poor standard.