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The bulbs of tropical spider lilies (Hymenocallis littoralis, Amaryllidaceae) contain antineoplastic and antiviral constituents, effective against certain cancers and serious fevers. Idso and colleagues show that bulbs grown in elevated CO₂, as predicted for global climate change, showed elevated concentrations of these medicinal compounds. Their data add to those already gathered on agricultural and ecological species. (see p. 769)

Walnut phylogeny

Stanford, Harden, and Parks make a significant contribution to our understanding of walnut (Juglans), for the first time presenting a synthesis of gene data, morphological data, and biogeography about this genus. They use DNA and fossil evidence to understand how walnuts came to be distributed over such a large part of the world. (see p. 872)

Southwestern Agaves

Slauson's detailed, thorough study of the pollination biology of Agave palmeri and its more northern sister species A. chrysantha shows that flexibility in "bat-adapted" floral traits has been an important factor in the evolution of these plants. Her data solve much of the controversy about bat/agave interactions. (see p. 825)

Genetic variability in rare species

Gitzendanner and Soltis offer an insightful review and synthesis of available literature on levels of genetic variation in rare species and their widespread congeners. They make the important point that the interpretation of genetic diversity values from a rare species is essentially meaningless unless these values are compared to those of a widespread congener. Their comparisons show that levels of diversity are highly correlated within genera. They suggest that a reexamination of the genetic properties of rare species is needed. (see p. 783)

This Article Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Search for Related Content