Archivos de Diario para septiembre 2017

03 de septiembre de 2017

Why Did Oak Trees Once Grow in the Middle of Pasadena Intersections?

It was no accident of haphazard surveying. It was a deliberate act of town planning that placed a massive oak tree in the middle of a major Pasadena intersection. When Calvin Fletcher laid out the San Gabriel Orange Grove Association subdivision in 1874, he oriented the main thoroughfare, Orange Grove Avenue, so that it would wrap around at least two ancient live oaks. Shade was a precious commodity on Pasadena’s mostly treeless mesa, and Fletcher’s plan saved these sprawling oaks by incorporating them into the avenue’s landscaped median.

Anotado en septiembre 03, domingo 10:18 por biohexx1 biohexx1 | 0 comentarios | Deja un comentario

20 de septiembre de 2017

American oaks share a common northern ancestor.

If you had been in northern Canada 45 million years ago, you might have encountered the distant ancestor of all of the oaks in the Americas. That single species gave rise to 220 more and two distinct lineages -- red oaks and white oaks -- that moved south through the boreal zone to populate large swaths of the continent all the way into Mexico.

Anotado en septiembre 20, miércoles 15:12 por biohexx1 biohexx1 | 0 comentarios | Deja un comentario