The extensive distribution and relative rarity of American persimmon makes fresh collection during fl owering time diffi cult, however. For this reason, air-dried herbarium specimens were used to provide samples from across the range (Appendix 1).
Edit: Rereading this paper I realized I misunderstood this part, but I do still think there may be some concerns.
Okay, I found this whole part weird. Maybe I haven't really been exposed to something like this, but this issue makes me think, if you don't have to resources get valid results, why do the study? It seems overall there is a lack of specimens, a discrepancy in male and female numbers, issues with the quality of herbarium collections, and the overall age of these specimens don't line up with the data it seems they are looking for. This is something I would love to chat about because to me, this study just does not make sense to do with the available resources.