Figure 2.

Boundary and intrusive vein collapse as functions of water potential (Ψ). A, Grand HI for each leaf is calculated over all conduits from both vein types. B, Type I HI is calculated over all conduits from intrusive veins only. C, Type B HI is calculated over all conduits from boundary veins. HI scores for each leaf are plotted at the branch water potential (black circles) or for rehydrated leaves at the final equilibrium water potential (white circles; initial Ψ = −3.5 to −2.7) and at the predicted final equilibrium water potential for leaves frozen immediately after rehydration (white triangles; initial Ψ = −3.5 to −2.5 MPa).