Sagebrush
Mame
I have started a number of different trees species from seed. I think the easiest are these honey mesquite. A bit of a pain to get to the seed. Removing the mottled coating on the pod, taking off the starchy white coating (sweet, and indigenous used for cooking), then splitting the seed coat to get at the seed. Finally a little nip with clippers on the seed itself pour boiling water over them and let sit for 24hrs. In 24hrs planted they were 1" tall and around 90% germination rate. Sounds labor intensive but not bad.