Nigel Cattlin / Common wintercress (Barbarea vulgaris) in field margin. Berkshire, England, UK. May.

Nigel Cattlin / Common wintercress (Barbarea vulgaris). Berkshire, England, UK. May.

Nick Upton / Yellow dung fly (Scathophaga stercoraria) grooming on a Yellow rocket (Barbarea vulgaris) flowerhead, Wiltshire, England, UK, May.

Nick Upton / Yellow dung fly (Scathophaga stercoraria) grooming on a Yellow rocket (Barbarea vulgaris) flowerhead before taking off, Wiltshire, England, UK, May.

Mike Read / Flowers (Barbarea rupicola) Restonica Valley, Corsica, France, May 2016.

Pete Oxford / Golden / Bebbe's rocket frog (Anomaloglossus beebei) endemic species that lives in Giant tank bromeliads, Kaieteur Falls, Kaieteur National Park, Essequibo, Guyana, South America

Pete Oxford / Beebe's Rocket Frog (Colostethus beebei), Kaieteur Falls, Potaro River, Kaieteur National Park, Guyana

Kevin Schafer / Beebe's Rocket Frog (Colostethus beebei) in Bromeliad (Brocchinia micrantha), Kaieteur Waterfall, Kaieteur National Park, Guyana

Kevin Schafer / Beebe's Rocket Frog (Colostethus beebei) in Bromeliad (Brocchinia micrantha), Kaieteur Waterfall, Kaieteur National Park, Guyana

Kevin Schafer / Rocket Pincushion (Leucospermum reflexum), Kirstenbosch Gardens, Table Mountain, Cape Town, South Africa

Thomas Marent / Beebe's Rocket Frog (Colostethus beebei), Kaieteur National Park, Guyana

Nick Upton / Common Wintercress / Yellow Rocket (Barbarea vulgaris) flowering on a river bank. Wiltshire, UK, April.