Cactus flower again

I photographed another flower on this cactus (Astrophytum ornatum) 28 March (see here). The plant is doing really well, and producing a succession of flowers.

This is useful, as I'm still experimenting with different depth of field and compositions, but the light has been poor today, as it has been raining solidly. Probably I should have ventured out for some raindrops, and left this to another day. The flowers don't last long, though, so I have an excuse for not getting wet.