Wildflower--St. Andrew's Cross

Recently my older sister showed me a plant that she wanted to identify.  I wasn't familiar with it, but, as it turned out, I was familiar with one of it's relatives.  Of course, I only knew the relative by face and not by name.  The plant my sister was looking at was a pineweed, hypericum gentianoides.  It has a brown woody stem.  The relative I'm more familiar with is hypericum hypericoides, or St. Andrew's Cross.  I've loved this plant since childhood, probably because I thought the yellow blooms looked like butterflies, but also because I liked the shade of green and the brown contrasts.  I probably also liked the shape of the leaves, which give the plant a handsomeness and symmetry.  Here is a little specimen growing in the front yard under my sycamore tree.  (It is a relative of St. John's wort, a plant sometimes used medicinally to treat depression.  Just looking at this little plant lifts my mood.)