S. kirkii 'Silver Blue'
The plant in this picture is somewhat rare.... or maybe I should just say not common in American collections. It has been pictured and described in Juan Chahinian's latest book, "The Splendid Sansevieria, 2005", as a kirkii species. Inflorescence at that time was not seen by Mr. Chahinian. I was pretty excited to see a bud this afternoon on this plant (pictured below) which shows that it is going to be a capitate flower.
Note the picture also shows: front and backsides of the leaves; the chestnut & white, wire thin, wavy leaf margins; and longitudinal lines on the front and back sides (some lines interrupted). I also think you can get a good feeling for the thickness (18-20 mm) of the leaves at the soil line. The leaves are quite stiff and not at all floppy.