Date the 100th plant flowered

It been a pretty average spring so far; maybe just a bit dry. Yesterday the 100th plant flowered, not the 100th individual plant, but the 100th different type of plant, mostly different species. So 100 different plants flowered by April 28th. Since beginning this data gathering a lot of plants have come and gone, so it isn't the same species list, but let's assume it hasn't been biased toward one direction or the other. The earliest the 100th plant flowered was March 25th in 2012, an exceptionally early spring. The latest the 100th plant flowered was May 5th in 2013 and 2014.  In 2010 the 100th plant flowered on April 21st and in 2011 if was on April 29th. TPP is struggling to get all this data out of notebooks and into a nice data base, but it isn't easy and is time-consuming. Things are listed in a goofy mix of common and scientific names, plus bloody cultivars and hybrids, and that takes time to sort out. Some people find it hard to believe that our gardens contain so many different plants. And things do surprise us at times. Last year a new Erythronium x "Pagoda" grew quite well and a nice display was expected this spring, but thus far it's a no show. So what happened? Don't know.