The yellow seasonal tree and orange seasonal trees are found in the seasonal forest biome in the mod Biomes o' Plenty (http://minecraft.curseforge.com/projects/biomes-o-plenty). There's also a Biomes of Plenty maple tree in this biome, but I've decided to make the Natura (http://www.curse.com/mc-mods/minecraft/natura) one instead, as I find it much nicer.
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