A hotspot of diversity for rare plants, butterflies and birds, the Klamath-Siskiyou region of southern Oregon is a scientist's (and naturalist's) paradise. This is transverse range running from the Cascades range to the Pacific Ocean, creating an east-west corridor between the coast and the volcanic Cascades range. Mark Madsen’s love of biology while living in the area for 15 years sparked an interest in botanical taxonomy in the world of serpentine soils and the plant communities thriving in the region, including remnant species from the last ice age.