Generally speaking, it seems that beans and many veggies are high in fiber. Most fruits I searched were in the 10-20% range. Here are my initial findings:

• Broccoli (~46%)
• Black Beans (~37%)
• Pinto Beans (~34%)
• Peas (~34%)
• Cabbage (~34%)
• Bran (~23%)
• Barley (~23%)

• Percentages based on Dietary Fiber / Total Carbs on nutritional labels