<Dd> Fused to the petiole base, as in Rosa . </Dd> <Dd> Provided with ochrea, or sheath - formed stipules, as in Polygonaceae; e.g., rhubarb . </Dd> <Dt> Encircling the petiole base </Dt> <Dd> <Dl> <Dt> Interpetiolar </Dt> <Dd> Between the petioles of two opposite leaves, as in Rubiaceae . </Dd> <Dt> Intrapetiolar </Dt> <Dd> Between the petiole and the subtending stem, as in Malpighiaceae . </Dd> </Dl> </Dd>

Where are these structures typically found on a leaf