The flora in North Cascades National Park is influenced by the great vertical relief, the amount of moisture an area receives, the slope and soil types as well as the fire ecology. This wide array of ecological niches has allowed a great biodiversity to evolve. Few other North American national parks have recorded as many vascular plant species as have been documented in North Cascades National Park. With 1,630 species documented, experts estimate adding non-vascular plants and fungi could more than double the number of known plant species.