Hibiscus fragilis is a very rare species native to Mauritius Island and perhaps Reunion. It is called the Mandrinette, and is in very limited cultivation. The rather small flowers, for a hibiscus, are borne in spring and summer. They do not appear to be self fertile, so I will need to wait for more than one plant to bloom to set seed. My original seed came from Chiltern Seeds, whose catalogue is a delight to read.