 They also record the plants contributed by visitors to the estate and by William Sharp Macleay's natural history collectors in India.Alexander Macleay had a great passion for bulbous plants, particularly those from the Cape of Good Hope.The explorer Charles Sturt, contributed many bulbs collected on his journey to South Australia in 1838, having been presented with four bulbs of Calostemma album from the Royal Botanic Gardens at Kew during his visit to Elizabeth Bay in February 1831.