Vascular Herbarium
Holdings of vascular plants at PH include >1 million specimens, the vast majority of which are mounted and stored conventionally. Pandanaceae are the crown jewel of our boxed / bagged collection of cones, fruits and seeds. These plants are the "screw pines," a group of woody Old World plants that look a bit like palms. As a result of Ben Stone's tenure here as curator, PH holds a remarkable series of infructescences, seeds, stems and occasionally other structures of screw pines. You can view this collection online at clade.acnatsci.org/botany/pandanaceae/.
It is both frustrating and exciting that it is so difficult to decide upon the best system for filing specimens of vascular plants in a modern herbarium. Frustrating because there is yet no fully resolved, strongly supported single phylogenetic system for these plants. Exciting because we have made a great deal of progress toward such a system. The good news is that we know a great deal more about the relationships of seed plants than we knew a very few years ago. The bad news is that this progress has served in part to point out the problems with all existing systems.
Why worry about filing phylogenetically at all? If you like to browse in libraries (or even in the grocery or hardware store), you will already know the answer. If you are seeking a particular book on a particular topic, it is interesting and often highly rewarding to encounter other books on this topic (rather than books by authors whose names happened to be alphabetically proximate to your original target book). Similarly, imagine a grocery shelf with beets next to bird seed next to chamomile tea… you’d rather have beets with the other canned vegetables, bird seed with the pet foods, etc., right?
We are currently filing seed plants by a system based on Dalla-Torre and Harms (ca. 1890) with a number of modifications designed to make our system better reflect what we know about plants. This system is certainly far from perfect and will no doubt be further modified. At the same time, progress is being made quite quickly in resolving some of the issues about plant relationships that we need to resolve in order to achieve some degree of both stability and accuracy (see, for example, the terrific Angiosperm Phylogeny web site maintained by Peter Stevens).
At PH, you will find our current system posted prominently in numerous places arranged both alphabetically [.pdf, 13KB] by family and numerically [.pdf, 13KB] (i.e., by numbers as assigned to families). Within families, genera are alphabetical and species are alphabetical within genera.
As we are in the process of implementing this system, you will find some families still filed by our older system. In all cases, if you do not find what you expect to find, ask a botany staff person for help.
Pteridophytes (i.e., ferns and fern allies) are the exception. Following the advice of our colleagues who study these plants, we are filing them alphabetically by genus (and alphabetically by species within genera).
Geographic Sources
| Region | % |
|---|---|
| Local (=southeastern PA and adjacent counties in NJ, DE and MD) | 29% |
| Other Nearctic | 41% |
| Neotropical | 9% |
| Palaearctic | 7% |
| Tropical SE Asia * | 5% |
| Temperate East Asia * | 3% |
| Other | 6% |
| * Significant portions of our back-log, estimated at 97,000 are from these areas. | |
About 70% of our specimens are from North America, with an emphasis on Pennsylvania, New Jersey and Delaware. Research for two major recent publications on the Pennsylvania flora was centered at the herbarium (A.F. Rhoads, W.M. Klein, and J.E. Klein [1993], Vascular Flora of Pennsylvania: Annotated Checklist and Atlas and A. F. Rhoads, T.A. Block, and A. Anisko (Illustrator) [2000] The Plants of Pennsylvania: An Illustrated Manual. More information can be found at the website for the Pennsylvania Flora Project.
PH has especially strong holdings of vascular plants from SE Pennsylvania and adjacent regions of New Jersey and Delaware. An effort to collect intensively from this area was launched soon after the founding of the Philadelphia Botanical Club in 1891. This local collection was curated by Bayard Long for most of the first half of the 20th century. In particular, our holdings of plants growing in the remarkable New Jersey Pine Barrens are the best in the world (to this, we share a common interest with the Pinelands Preservation Alliance. More generally, the depth and breadth of collections from our region are emblematic of the strength of the relationship between the Academy and the Philadelphia Botanical Club.
Geographic Filing System
We are also in the process of streamlining our geographic filing system [.pdf, 215KB]; we are grateful to Bruce Bartholomew (California Academy of Science) for sharing the CAS system with us. Our filing order will transition to: PA, NJ, DE, Other North America north of Mexico (with states then provinces in alphabetical order), Latin America (all of western hemisphere from Mexico south), Europe and the Middle East, Africa, Asia, Pacific Islands (including Australia and New Zealand). Color-coded maps of the geographic system are posted.