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Science 27 November 1998:
Vol. 282. no. 5394, pp. 1692 - 1695
DOI: 10.1126/science.282.5394.1692
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Reports
In Search of the First Flower: A Jurassic Angiosperm, Archaefructus, from Northeast China
Ge Sun,
*
David L. Dilcher,
*
Shaoling Zheng,
Zhekun Zhou
Angiosperm fruiting axes were discovered from the Upper Jurassic of
China. Angiosperms are defined by carpels enclosing ovules, a character
demonstrated in this fossil. This feature is lacking in other fossils
reported to be earliest angiosperms. The fruits are small follicles
formed from conduplicate carpels helically arranged. Adaxial elongate
stigmatic crests are conspicuous on each carpel. The basal one-third of
the axes bore deciduous organs of uncertain affinities. No scars of
subtending floral organs are present to define the individual fertile
parts as floral units, but the leaf-like structures subtending each
axis define them as flowers. These fruiting axes have primitive
characters and characters not considered primitive.
G. Sun, Nanjing Institute of Geology and Palaeontology, Academia
Sinica, Nanjing 210008, China. D. L. Dilcher, Florida Museum
of Natural History, University of Florida, Gainesville, FL 32611, USA.
S. Zheng, Shenyang Institute of Geology and Mineral Resources, Shenyang
110032, China. Z. Zhou, Kunming Institute of Botany, Academia Sinica,
Kunming 650204, China.
*
To whom correspondence should be addressed. E-mail:
gsun@jlonline.comi; dilcher{at}flmnh.ufl.edu
Read the Full Text
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