Logo IMG
HOME > My Amsci > Restricted Access

Restricted Access The content you've requested is available without charge only to active Sigma Xi members and American Scientist subscribers.

If you are an active member or an individual subscriber, please log in now in order to access this article.

If you are not a member or individual subscriber, you can:


Figure 6. Hermaphrodites in cardon cactiClick to Enlarge Image

The saguaro cactus and its cousins the cardon, organ pipe and senita cacti dot the landscape of the Southwestern United States. Indeed, they are the hallmark of this desert landscape. Judging from the shape of the flowers, it is clear, says the author that these cacti originally evolved to accommodate bats as their pollinators. But in order to expand their geographic range into areas where the bats were less abundant, these plants have developed unusual—some might even say bizarre—new mechanisms for attracting pollinators and for reproducing. One species of cactus, for example, is capable of producing four different sexes.

Connect With Us:


Subscribe to Free eNewsletters!

Read Past Issues on JSTOR

JSTOR, the online academic archive, contains complete back issues of American Scientist from 1913 (known then as the Sigma Xi Quarterly) through 2005.

The table of contents for each issue is freely available to all users; those with institutional access can read each complete issue.

View the full collection here.

RSS Feed Subscription

Receive notification when new content is posted from the entire website, or choose from the customized feeds available.

Write for American Scientist

Review our submission guidelines.

Subscribe to American Scientist