THE issue of the fourth volume of “The Cactaceæ” brings this sumptuous monograph of the family to a conclusion. Previous volumes have been discussed in NATURE, vol. 107, p. 580, and vol. in, p. 426.

This question of why some branches of the tree of life explode into thousands of species, while others remain small, has shaped evolutionary biology since Charles Darwin. My colleague and I have ...

With almost a third of cacti species threatened with extinction, a new open access database of cactus ecology and evolution could help scientists and conservationists save species from the brink.

From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or ...

The largest genus in the cactus family (Cactaceae) is Mammillaria, and a very recognizable member is the twin spined cactus (Mammillaria geminispina). This small cactus has tiny tubercles (rounded ...

"Unaltered republication of the second edition published in 1937 ... First published in 1920 as Publication no. 248 of the Carnegie Institution of Washington" STRI copies 39088009789587 & ...