It included just one species , Grayia polygaloides Hook .
The genus Grayia has been first described by William Jackson Hooker and George Arnott Walker - Arnott in 1840 in : The Botany of Captain Beechey 's Voyage ( p. 387 -- 388 ) .
Grayia included just one species , Grayia polygaloides Hook .
The genus Grayia has been first described by William Jackson Hooker and George Arnott Walker - Arnott in 1840 in : The Botany of Captain Beechey 's Voyage ( p. 387 -- 388 ) .