UBV I CCD photometry is obtained for the open clusters NGC 4609 and Hogg 15 in Crux. For NGC 4609, CCD data are presented for the first time. From new photometry we derive the reddening, distance modulus and age of each cluster - NGC 4609 : E(B-V ) = 0.37 ± 0.03, V0 - MV=10.60 ± 0.08, log τ = 7.7 ± 0.1; Hogg 15 : E(B - V ) = 1.13 ± 0.11, V0 - MV = 12.50 ± 0.15, log τ ≲ 6.6. The young age of Hogg 15 strongly implies that WR 47 is a member of the cluster. We also determine the mass function of these clusters and obtain a slope Γ = -1.2 (±0.3) for NGC 4609 which is normal and a somewhat shallow slope (Γ =-0.95 ± 0.5) for Hogg 15.

UBVI CCD photometry is obtained for the Ruprecht 93 (Ru 93)region. We are unable to confirm the existence of an intermediate-age open cluster in Ru 93 from the spatial distribution of blue stars. On the other hand, we find two young star groups in the observed field: the nearer one (Ru 93 group) comprises the field young stars in the Sgr-Car arm at d ≈ 2.1 kpc, while the farther one (WR 37 group) is the young stars around WR 37 at d ≈ 4.8 kpc. We derive an abnormal extinction law (RV = 3.5) in the Ruprecht 93 region.