FIGURE. l. Cross-sectional petiole shapes in Anthurium.

A. Basically terete: ranging from esulcate (l). to shallowly and acutely sulcate (2 & 3), to obtusely and broadly sulcate (4), to narrowly and obtusely sulcate (5). to narrowly and acutely sulcate (6), broadly and acutely sulcate (7), shallowly and broadly sulcate (8), flat adaxially (9), flat adaxially with marginal ribs (10), to flat adaxially with marginal and medial ribs (l l).
B. D-Shaped or broader than thick: ranging from flat adaxially with obtuse margins (l), lo broadly sulcate with obtuse margins (2). broadly sulcate with acute margins (3), flat adaxially with acute margins (4). flat adaxially with erect margins (5), flat adaxially with erect margins and with l or more medial ribs (6 & 7)
C. U-shaped or thicker than broad: ranging from broadly and obtusely sulcate (l) to narrowly and oblusely sulcate (2), narrowly and acutely sulcate with acute margins* (3), shallowly and acutely sulcate* (4), sulcate with acute margins (5), sulcate with sharp margins and a medial rib* (6).
D. Markedly angular: ranging from quadrangular with acute angles (l) to quadrangular with obtuse angles (2), trapezoidal (3), obtusely triangular (4), acutely triangular (5). acutely triangulŠr with two marginal ribs (6), basically triangular with two abaxial ribs (7), obtusely triangular, narrowly and sharply sulcate with convex sides (8).
E. Markedly ribbed abaxially: ranging from trapezoidal or quad- rangular. sharply and broadly sulcate adaxially, 3-ribbed abaxially (l), to obtusely and broadly sulcate adaxially, 3-ribbed abaxially (2), broadly and obtusely sulcate adaxially 5-ribbed abaxially (3). broadly and sharply sulcate adaxially, narrowly and sharply ribbcd around the remaining circumference (4), or with one or more ribs on the sulcus (5)

* Not yet observed but to be expected.