Nolina Michx.
Engl.: beargrass.

Nolina guatemalensis:

Nolina guatemalensis (Rose) Cif. & Giacom., Asparagaceae: See Beaucarnea guatemalensis Rose.

Nolina microcarpa

Nolina microcarpa S. Wats.
Engl.: sacahuista, beargrass.

Nolina recurvata:

Nolina recurvata (Lem.) Hemsl., Asparagaceae: See Beaucarnea recurvata Lem.

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