HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

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

In conjunction with the results of previous molecular studies of the group, Downie, Katz-Downie, and Watson use data from two chloroplast introns to recognize seven monophyletic tribes within Apiaceae subfamily Apioideae. The higher level relationships within the apioid umbellifers have heretofore been obscure and the series of papers by Downie and collaborators are proving extremely valuable in documenting their major lineages and the relationships among them. (see p. 273)

Effect of wind speed on pollen capture

Roussy and Kevan show in a wind-tunnel study that the percentage of pollen capture by megastrobili of jack pine is invariant with wind speed. This result is in contrast to the predicted increase in relative capture efficiency with increasing wind speed for a sphere. Their findings suggest that receptive megastrobili are equally adept at capturing pollen at all naturally occurring wind speeds. (see p. 215)

Apical dominance in trees

Cline provides much needed data on the extent to which the classic Thimann-Skoog or auxin replacement apical dominance test of exogenous auxin repression of lateral bud outgrowth can be applied to intact branches of woody plants. These results also aid in elucidating the role of auxin in tree apical dominance. He shows for the first time that this classic auxin experiment can, with certain limitations, be done on the intact twig of a hardwood tree. However, apical dominance in trees involves unique features not present in herbaceous plants. (see p. 182)

Success of C₃ evergreen subshrub in C₄-dominated grassland

Maragni et al. describe a potential mechanism for the maintenance of a C₃ species, Yucca glauca, within C₄-dominated grasslands of the Great Plains. The ability to photosynthesize in the late fall and early spring during and following periods of cold temperature may account for the distribution of Yucca glauca. The authors discuss potential patterns of carbon gain in a future warmer climate. (see p. 230)

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