Sansevieria Thunb.
Engl.: sansevieria.

Sansevieria angolensis:

Sansevieria angolensis Welw., Agavaceae: See Sansevieria cylindrica Bojer.

Sansevieria cylindrica

Sansevieria cylindrica Bojer.
Engl.: spear orchid.
Bot. syn.: Sansevieria angolensis Welw.

Sansevieria roxburghiana

Sansevieria roxburghiana Schult. & Schult. f.
Engl.: Indian bowstring hemp.

I have no articles for this botanical term, but there might be some for the next level down (if found).