Definition of "rosella"

Molly […] had glimpsed a future, like a rosella, hardly seen, swooping through the high umbrellas of the bush.

1985, Peter Carey, Illywhacker, Faber and Faber, published 2003, page 138

Rosellas, a fruit, I imagine, not very well known, we grew most successfully, its delicious sub-acid making the most splendid substitute for the English red currant; and we varied its uses by transforming the raw material into jam and jelly, and freshly-stewed fruit.

1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 122