Prerequisites: Wis 13, Knowledge (nature) 4 ranks, any neutral alignment (NG, LN, N, CN, or NE), able to cast any summon nature’s ally spell.
Benefit: You can spontaneously cast summon nature’s ally spells (from your class spell list) just as a druid can. You may use this ability a total number of times per day equal to your Wisdom modifier.
Source: Complete Divine, page 85.