Not everything is, as it seems
Strains to date are:
Cannabis Sativa
Cannabis Indica
Cannabis Rudialis
Cannabis Americana

Since the article suggests only two and refers to Indica as a hemp variety (pretty far from reality) I might point out that more research needs to be done before believing it. I understand the tall hemp plants are mostly sativa and the Americana was developed to be more robust in hemp rope. But hell, I am not normal or NORML.