Recording Deergrasses


Vernacular names


Trichophorum cespitosum sensu stricto has already an accepted vernacular name, "Northern Deergrass".

In both
New Flora of the British Isles, Ed. 3 (Stace) and Sedges of the British Isles (BSBI, Ed. 3) T. germanicum is called simply "Deergrass". The problem is then that the term "deergrass" is ambiguous, and can be used either as a group name or for the common species.

I have pressed for
unique vernacular names, T. germanicum to be called (I suggest, with crushing logic) "Common Deergrass" (and Clive Stace has agreed to use this as the vernacular in ’Stace 4’), and the hybrid to be "Hybrid Deergrass". I have used these names in this website. My own view is that the use of simple vernacular names like these in conversation, or more formally, helps to reduce confusion for those new to the group's intricacies!


Once you have sussed out the three taxa, you’ll be wanting to record them individually, and not merely as the aggregate...

In any system for data-input,
please be very careful NOT to enter “Trichophorum cespitosum” when you intend Common Deergrass, T. germanicum!

The two species may be found in some systems at subspecies rank:

T. cespitosum = "Trichophorum cespitosum subspecies cespitosum", and

T. germanicum = "T. cespitosum subspecies germanicum".

The hybrid may appear as
"Trichophorum cespitosum nothosubspecies foersteri".


Entering from BRC codes

These are the BRC codes:

  •      T. cespitosum, Northern Deergrass: 1858.1
  •      T. germanicum, Common Deergrass: 1858.2
  •      T. × foersteri, Hybrid Deergrass: 1858.3


BSBI Distribution Database


This is the somewhat confusing dropdown menu that appears in BSBI's Distribution Database for 'trichophorum',
but I have indicated what taxa are selected with each option:

DDb options for Trichophorum selection narrow


MapMate

Thanks to Phill Brown for the following.
If entering
records by name: after typing in "trichop" you should get the following selection:

"Trichophorum cespitosum (Northern Deergrass)
Trichophorum cespitosum nothosubsp. foersteri (T. cespitosum subsp. cespitosum x subsp. germanicum)
Trichophorum germanicum (Deergrass)
Trichophorum germanicum agg. (Deergrass)"

This annotated screengrab should indicate which entry to use:


MapMate Trichophorum choices


Do let me know how I can improve this page, especially with advice for entering on other systems.

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