[APWG] early-flowering stiltgrass

[Patricia_DeAngelis at fws.gov]

Hi Angie and APWGers:

I can't answer your question directly, but hope that another question 
directed to the group may help to do so. 

I recall several years ago that there were efforts to map the spread of 
invasives - the particular project I recall was happening in the Pacific 
Northwest. I believe it was similar to some of the phenology work that is 
happening now for native species.

I see there are a lot of resources the appear to be at the state or 
regional level when I search on "invasives mapping" and could probably 
spend days looking thru it all to see if one of them tracks stiltgrass. 

But, I'm wondering if someone on this list could instead point us toward a 
resource that they know to be tracking stiltgrass or that at least is a 
more central resource for trying to figure out who might be tracking 
stiltgrass. 

Patricia S. De Angelis, Ph.D.
Botanist, Division of Scientific Authority-US Fish & Wildlife 
Service-International Affairs
Chair, Medicinal Plant Working Group-Plant Conservation Alliance
4401 N. Fairfax Dr., Suite 110
Arlington, VA  22203
703-358-1708 x1753
FAX: 703-358-2276

Promoting sustainable use and conservation of our native medicinal plants. 

<www.nps.gov/plants/medicinal>

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Angie Shelton <anshelto at indiana.edu> 
Sent by: apwg-bounces at lists.plantconservation.org
08/16/2012 12:35 PM

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Subject
[APWG] early-flowering stiltgrass






Hello all, 

I have noticed that Japanese stilt grass in south central Indiana started 
setting seed by the first week of August this year.  Seed set in this area 
usually begins in late August to early September. This year's seed set is 
almost a full month earlier than usual.  Control efforts on this annual 
plant need to be done before seed set to be effective, so an earlier 
flowering time reduces the time for late-season management.   

The earlier flowering could be a result of a warm, early spring that 
caused stiltgrass and most native spring plants to germinate 3-4 weeks 
earlier than usual.  It could also be due to a much warmer than usual 
summer.  These causes are not mutually exclusive.  

I am curious if Japanese stiltgrass is also flowering earlier than usual 
in other regions.  If so, was germination also earlier than usual?  Summer 
temperatures were probably warmer than usual across the entire range in 
the eastern U.S.  What are the typical germination and flowering times in 
more southern regions where the growing season is longer?  Being able to 
predict flowering time across a range of conditions is important to know 
when the deadline is to complete management efforts for the year.  


Angie Shelton
Department of Biology
IU Research & Teaching Preserve
Indiana University
Bloomington, IN 47405
812-855-1674
anshelto at indiana.edu
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