Holdridge Life Zones. Much of the distribution of plant life can be understood through large scale climatic patterns. (New Zealand). (South America). Tussock (or bunchgrass) grasslands. . Thornscrub. (Arizona). (South Africa). Raunkier\'s life forms. . . . Similarly, plant growth can be summarized in basic descriptors of where the over-wintering, or dormant season capacity for growth (bud) resides.