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In this issue

The endangered

The endangered Penstemon haydenii, blowout penstemon, is one of the rarest plant species endemic to the Great Plains. Caha et al. assessed genetic diversity of existing populations using restriction fragment length polymorphisms (RFLPs). (see p. 1704)

The data of Case et al. support the designation of the rare Kentucky lady's slipper, Cypripedium kentuckiense, as a distinct species within the North American lady's slipper complex. The authors also discuss the difficulties associated with this species' conservation. (see p. 1779)

Evolution of polyploids

Husband and Schemske use flow cytometry to determine the cytotypes of fireweed (Chamerion angustifolium) in the Beartooth Pass of Wyoming and Montana, and with this information locate areas where individuals with two, three, or four copies of their genome occur in close proximity. (see p. 1668)

Orchid reproductive biology

The low fruit set of the Orchidaceae has long puzzled botanists. In the first comprehensive survey of more than 100 orchid species in the literature and from their own field studies, Neiland and Wilcock show that fruit set is doubled in orchids providing nectar vs. nonrewarding orchids and the lowest fruit sets of all are found in the tropics. (see p. 1657)

An 11-yr experimental study by Primack and Stacey documents the cost of extra fruit production in the pink lady's slipper orchid Cypripedium acaule. (see p. 1672)

Plant response to nutrient heterogeneity

In a neighborhood experiment using patchy distributions of nutrients, the results of Casper and Cahill suggest that individual plants within populations are able to access widely spaced nutrient patches through long-distance lateral root growth. (see p. 1680)

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