As I record species at the Witchwood, I check against this list to identify any not officially recorded in that list for Hillsborough County. I've found a dozen so far.
In most cases, these seem to be simple oversights. Many species like Cardinal Flower (Lobelia cardinalis) are widespread in Hillsborough County, but nobody seems to have gotten around to filing an herbarium specimen documenting it.
In other cases, my observations may represent recent changes to plant distribution. American Jumpseed (Persicaria virginiana) is known from western NH counties and MA, but not from Hillsborough County. I'm really excited about that one!
I checked with the NH state botanist, Bill Nichols, and he told me that to be added to the list, a specimen must be collected and a voucher put on file with a local herbarium. A voucher is a pressed, dried specimen of a plant with notes about the species, location, and collector. When possible, vouchers should include the whole plant including roots and preferably be in flower or fruit to aid identification.
I just mailed him vouchers for four species:
Cardinal Flower (Lobelia cardinalis):
I am so excited to make this small contribution to scientific records of species distribution!
There are several more that I need to voucher next year: