Information authenticated by Tim Rich of the National Museums and Galleries of Wales.
Ex-situ: Measures to conserve a species or habitat that occur outside of the natural range of the species. E.g. in zoos or botanical gardens.
Perennial: Plants that live for at least three seasons; after an initial period they produce flowers once a year.
Whorl: In animals, the spiral or convolutions in the shell of a snail. In plants, a set of leaves, flowers, or branches that spring from a stem at the same point and encircle it.