Selection of optical spectra of SN 2016adj de-reddened and compared with similar phase spectra of the type IIb SN 2011dh (Ergon et al. 2014), the type Ib SN 2007Y (Stritzinger et al. 2009), and the type Ic SN 2005az (Bianco et al. 2014; Modjaz et al. 2014). The epochs labeled next to each spectra are relative to the epoch of r-band maximum. Similar to the type Ic SN 2005az, the spectra of SN 2016adj lack Balmer lines (dashed magenta) and He I features (red dash lines), both of which develop past maximum in the SNe 2007Y and 2011dh. C II lines are indicated with blue dashed lines.