| 1 | Leaf base sagittate to subcordate; usually more than 20 flowers oer inflorescence. |
| 1' | Leaf base truncate to cuneate; usually less than 15 flowers per inflorescence |
| 2 | Leaf oval to round, usually with 5-15 flowers per inflorescence, tristvlous. |
| 2' | Leaf usually 2-3 times longer that wide, 2-3 flowers per inflorescence. homostylous. |
