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Table 1 Comparison of Schmeissneria to Ginkgoales, Gnetales, and angiosperms.

From: Schmeissneria: A missing link to angiosperms?

Characters Schmeissneria [24,*] Ginkgoales[24,31,32,45] Gnetales[31-32,47,83-84] Angiosperms[1]
Long/short shoot + + - +/-
Shoot articulate - - + +/-
Phyllotaxis Irregular spiral Spiral on short shoot Opposite/whorled Opposite, whorled, spiral
Leaf Slender-cuneiform, obtuse apex Fan-shaped, or cuneiform Strap-like, triangular, linear or oval-shaped Various
Venation Parallel Dichotomous Parallel or reticulate Various
Unisexuality + + + (-) +/-
Reproductive axis articulate - - + +/-
Bract - - + +/- (?)
Bract arrangement N/A -(? bract scale seed complex) Whorled/paired Whorled, paired, or N/A
Ovuliferous unit position On peduncle tip, in pair On peduncle tip, single, pair or more in group In bract axil, one to many in a group Terminal/axillary
Ovuliferous unit with septum + - - +/-
Ovule Completely enclosed by central unit wall Exposed through micropyle Exposed through micropylar tube Completely enclosed by carpel or secretion
Micropylar tube - - + -
  1. Note that the character of enclosed ovule distinguishes Schmeissneria and angiosperms from the other two groups.*: information from this paper.