Columbia subject headings:
Harvard subject headings:
Haworthia--Identification.
Haworthia--Pictorial works.
Haworthia--South Africa--Classification.
Haworthia--South Africa--Identification.
Haworthia--South Africa--Pictorial works.
Princeton subject headings:
Haworthia--Identification.
Haworthia--Pictorial works.
Haworthia--South Africa--Identification.
Haworthia--South Africa--Pictorial works.