Mom Che Puteh's Garden, Alor Setar, Kedah, Malaysia.  Sansevieria trifasciata Prain. Asparagaceae. Also placed in Agavaceae, Convallariaceae, Dracaenaceae, Liliaceae, Ruscaceae. CN: [Malay - Lidah jin, Lidah mertua], African bowstring-hemp, Konje-hemp, Mother-in-law's-tongue, Snakeplant. Native of Zaire, Nigeria. Ornamental and folk medicines. Sansevieria "Hahnii" is a cultivar of Sansevieria trifasciata having rosette characteristic. A study by NASA found that it is one of the best plants for improving indoor air quality by passively absorbing toxins such as nitrogen oxides and formaldehyde.  Synonym(s): Sansevieria laurentii De Wild. [Sansevieria trifasciata var. laurentii]   Ref and suggested reading: www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?33072 en.wikipedia.org/wiki/Sansevieria_trifasciata