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Pinus murrayana [[insertion]] no specimen [[/insertion]], while Pinus monticola and Abies nobilis are so close as almost to reach timber line. [[insertion]] now A. procera Rehd. - no specimen [[/insertion]]
The fact[[strikethrough]] s [[/strikethrough]] that the flora of Mount St. Helens is very sparse is doubtless due to the youth, geologically speaking, of the mountain. This results  in
1. Aridity of the soil
2. Instability of the soil and rocks, due to rapid erosion.
3. Sterility of the soil, and
4. Perhaps to the inability of the mountain to stock itself with [[insertion]] ^ arctic alpine [[/insertion]] plants during the glacial period.