The link above opens a page with 176 results instead of the 61 results expected. The date filter is well defined but disabled by default when the page is loaded. Bug report.
About Senna bicapsularis, there is one specimen (or possibly a few specimens) with 100 observations (still increasing, 115 observations 4 days later) that will likely contribute much to the next Computer Vision learning session. It should not be an issue, provided the CV is not biased by recurring artifacts such as the braided flowerpot or the red fence.