| Pinna, a primary division with its leaflets of a bipinnate or tripinnate leaf. |
| Fronds eight to eighteen inches long, lanceolate-oblong, tripinnate. |
| The lower leaves, with very short, sheathing footstalks, are large and spreading, reaching more than a foot in length, broadly triangular in outline and tripinnate. |
| The first form, the normal leaf, consists of true leaves that are bipinnate or occasionally tripinnate. |
| We saw plenty of Tillandsia truncata, a large tank Till with a meter long tripinnate pink inflorescence that arched out sideways. |
| When these leaflets are again divided in the same way, the leaf becomes thrice pinnate, or tripinnate, as in many Acacias. |
