Champaign, Ill. (WCIA)
There are several different varieties of very common houseplants.
Each specific variety has a little different appearance than the more common variety (such as a different color or shape of leaf.
The exception would be the last slide on orchids, where it is just informational to warn folks that orchids may not be the best for beginners as their care is a little tricky.
The issue with orchids is that they are widely available in everyplace (even the supermarket) nowadays and lots of folks take them home with high expectations and wind up with a poor houseplant.