@article {356, title = {Phylogenetic analysis of dioecy in monocotyledons}, journal = {The American NaturalistThe American Naturalist}, volume = {155}, number = {1}, year = {2000}, pages = {46-58}, abstract = {Surveys of plant breeding systems in angiosperm families have shown a significant association between monoecy and dioecy, and researchers have proposed that dioecy has tended to evolve from monoecy. We evaluated this hypothesis in the context of a phylogeny of 918 monocotyledons assembled from 19 published trees. Binary and multistate breeding system characters were mapped onto a set of composite trees, and alternative models of character change were compared using maximum likelihood. Over a range of tree topologies and optimizations, we found three to eigth times as many changes from hermaphroditism to dioecy as we did from monoecy to dioecy. Also, the rate at which monoecy gave rise to dioecy was not significantly higher than the rate at which hermaphroditism gave rise to dioecy. Our analysis implies that the correlation of monoecy and dioecy in angiosperm families does not reflect a preponderance of changes from monoecy to dioecy. Instead, we postulate that the family-level correlation results from the clustering of breeding systems changes in the underlying phylogeny. Our results suggest renewed attention to modeling the transition from hermaphroditism to dioecy, possibly involving transient intermediates such as gynodioecy.}, keywords = {breeding systems, dioecy, monocotyledons, phylogeny, parsimony, maximum likelihood}, author = {Weiblen, George D. and Oyama, Ryan K. and Donoghue, Michael J.} } @article {324, title = {Distribution of Triglochin maritimum (Juncaginaceae) in Poland}, journal = {Fragm. Flor. Geobot.Fragm. Flor. Geobot.}, volume = {45}, number = {1-2}, year = {2000}, pages = {445-456}, abstract = {The distribution map of Triglochin maritimum L. and list of localities in Poland is given, based on herbarium materials, the literature and unpublished data. In Poland T. maritimum occurs on wet and usually saline meadows along the Baltic coast and in inland localities.}, keywords = {Triglochin maritimum, halophyte, distribution in Poland}, author = {Sotek, Zofia} } @article {256, title = {Lilaea scilloides (Poir.) Hauman (Lilaeaceae), en Asturias}, journal = {Anales Jard{\'\i}n Bot{\'a}nico de MadridAnales Jard{\'\i}n Bot{\'a}nico de Madrid}, volume = {58}, number = {1}, year = {2000}, note = {Lilaea in Spain known from Asturias (Llanera, La Morgal) and Galicia (Valdovino, La Coruna)}, pages = {191}, keywords = {Lilaea scilloides, Asturia}, author = {Nava, Herminio S. and Fern{\'a}ndez Casado, M. {\'A}ngeles and Su{\'a}rez P{\'e}rez, Francisco Javier} } @article {54, title = {Floral structure and development of Acoraceae and its systematic relationships with basal angiosperms}, journal = {International Journal of Plant Sciences}, volume = {161}, year = {2000}, pages = {23-41}, abstract = {

Flower development and anatomy of Acorus calamus and flower anatomy of A. gramineus were studied. Findings were compared with published reports on paleoherbs. Important developmental features include an abaxially median tepal that is initiated first and is similar to a flower-subtending bract and unidirectional flower development with an inversion of organ initiation sequence in the second tepal whorl. The mature gynoecium is largely synascidiate, but early development of carpels is plicate, and the apocarpous portion persists up to anthesis. The carpels form dorsal bulges on the style, enclosing longitudinal intercarpellary slits. The dominance of the synascidiate portion and the apical position of the placenta result from a late and distinct basal elongation of the gynoecium. Stigma, pollen transmitting tract, and ovary are filled with secretion. Secretory papillae are present from the stigma to the placenta; papillae also occur on the rims of the integuments of the ovules. In the uppermost part of the inflorescence, the adaxial floral sectors are reduced in number and structure, and at the apex of the inflorescence, a peloria-like structure is formed. Developmental and morphological similarities seem to be closer between Acorus and Piperales than between Acorus and other magnoliids.

}, keywords = {Acoraceae, complex organs, flower development, monocots, paleoherbs, Piperales}, url = {http://www.jstor.org/stable/10.1086/314241}, author = {Buzgo, Matyas and Endress, Peter K.} } @article {31, title = {Early Cretaceous lineages of monocot flowering plants}, journal = {Proc. Natl. Acad. Sci. USAProc. Natl. Acad. Sci. USA}, volume = {97}, number = {9}, year = {2000}, pages = {4707-4711}, keywords = {Cretaceous, fossils, monocots}, author = {Bremer, Kare} } @article {5, title = {Molecular analysis of plant migration and refugia in the Arctic}, journal = {Science}, volume = {289}, year = {2000}, pages = {1343-1346}, author = {Abbott, Richard J. and Smith, Lisa C. and Milne, Richard I. and Crawford, Robert M.M. and Wolff, Kirsten and Balfour, Jean} }