F1V

Morgan71 lists Rho Gem as a F1V standard, but Morgan65 calls
it a fundamental F0V standard (and Cowley69 uses it as F0V standard).
Morgan65 did not classify any Hyads as F1V. 

Cowley69 and Cowley74 used 37 UMa as its F1V standard. 

Gray01/03/06 lists 14 F1V stars. Median HIP colors:
<B-V>(F1V) = 0.313 (+-0.005 sem, +-0.014 stdev; N=14)
<V-I>(F1V) = 0.368 (+-0.008 sem, +-0.026 stdev; N=14)

# No Standard
Houk does not provide an F1V standard, and does not treat F1 as a full
type (she does list five "F1" HD stars, but they all have comments)

JM53, Morgan65, MK73, Cowley76, Gray89, Keenan85, GrayNstars also do
not list a F1V standard Skiff08 does not flag any stars as F1V MK
standards.

# Standard
HD 167858 = HR 6844
  F1V: GrayGarrison89(F1V+),Gray89(F1V+),Abt95
  F2V: Cowley74

# Weak Standard
HD 91480 = 37 UMa
  F1V: Roman49,Morgan53,Jaschek64(all),Cowley74(stan),GrayGarrison89
  F0: Cannon
  F2V: Levato78,Gray03
  A9Vs: Adams35

HD 58946 = rho Gem 
  F0V:  Garcia89,Jaschek64,Jaschek78,Morgan65,JM53
  F0V+: Gray89 (MgII 4481A sl wk)
  F0:   Cannon 
  F1V:  Morgan71,Gray03
  F1mA9V: Garrison72(stan)
  F2-3VA S: Kennedy83 
  "A" is a spectroscopic binary (Worley96), so not ideal standard
  B-V = 0.316 (Mermilliod91)
  No Houk type, lit. types disagree a bit, and it's spec binary
  Morgan65 uses rho Gem as the F0V "fundamental classification standard", but then Morgan71 calls its F1V