If you can precisely identify the proper name of any of the following—or have a lead which you think might be useful—please post a comment, preferably including a URL which links to evidence supporting your identification.
This plant appears as the registration device on Lesotho’s 20-loti note dated 1990 (P12):
IDENTIFIED: Agave plant and flowers.
This left and flowers appear as the registration device on Lesotho’s 100-loti note dated 2001 (P19):
IDENTIFIED: Calla lily (Zantedeschia aethiopica) leaf and flowers.
This plant appears as the registration device on Lesotho’s 200-loti note dated 1994 (P20):
These flowers appear on the back of Lesotho’s 10-loti note dated 2010 (PNL):
IDENTIFIED: Cosmos flowers.