Table 1

Comparison of Schmeissneria to Ginkgoales, Gnetales, and 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

-

-

+

-


Note that the character of enclosed ovule distinguishes Schmeissneria and angiosperms from the other two groups.*: information from this paper.

Wang et al. BMC Evolutionary Biology 2007 7:14   doi:10.1186/1471-2148-7-14

Open Data