These suggest that plants were about 60 cm (2 ft) tall, and consisted of a conical stem with helically arranged leaves.

The leaves were broadly elliptical, with a pointed apex and a base that clasped the stem.

The pollen-bearing organs consist of an axis with many helically arranged microsporophylls, each with a pair of pollen sacs.

The ovule-bearing organs consist of an axis bearing structures interpreted as carpels.

When fossil reproductive structures were assigned to Sanmiguelia, it was considered to be a primitive angiosperm that combined features of both monocots and dicots.