DOI
10.5642/aliso.19911301.05
First Page
107
Last Page
165
Abstract
Embryological character states are mapped on the diagrams of dicotyledons (G. Dahlgren 1989). The often well-defined pattern of distribution forms a basis for discussing and clarifying phylogenetic relations. It is shown how numerous embryological characters, alone or in combinations, support certain systematic constellations, even if the character states may have arisen independently within a varying number of evolutionary lines. Characters presented are: anther wall formation; tapetum types; cells in pollen grains at dispersal; microsporogenesis; ovule morphology; ovule integuments; endothelium; obturator; parietal tissue; embryo sac formation; antipodal cells; hypostase, embryogeny; polyembryony; endosperm formation; persistence of endosperm; ruminate endosperm; endosperm haustoria; perisperm; storage compounds in the endosperm; chlorophyllous embryo; embryo size, seed coat characters; arils; dry and wet stigma types.
Recommended Citation
Dahlgren, Gertrud
(1991)
"Steps Toward a Natural System of the Dicotyledons,"
Aliso: A Journal of Systematic and Floristic Botany:
Vol. 13:
Iss.
1, Article 5.
Available at:
https://scholarship.claremont.edu/aliso/vol13/iss1/5
Rights Information
© 1991 Gertrud Dahlgren
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.