B1.5V

Lesh68 uses HD 215191 as the B1.5V standard. 
Walborn71 uses HD 154445 as the B1.5V standard.
Walborn90 uses HD 36959 as its B1.5V standard.

The brightest star classified by Morgan55 as B1.5V is HD 151890 (V=3.0).

The brightest star classified by Hiltner69 as B1.5V is HR 4942 (V=4.3)
and HR 5440 (B1.5Vn; V=2.3).

# Standards
HD 36959 =
  B1.5V: Walborn90

HD 154445
  B1.5V: Walborn72

HD 215191
  B1.5V: Lesh68(stan)