[PCA] Isoaltion Distances

[Gregory Houseal]

We looked at this issue several years ago as part of the Native Species
Committee at Iowa Crop Improvement Assoc.  There is a fair amount of
literature on congeneric hybridization in native genera including Gentiana,
Baptisia, Silphium, Echinacea, Asters, Liatris, etc.  Fortunately, even
when it occurs, it seems to be at a low level, generally, and resulting
hybrid seed may have poor viability.  But hybrids do occur. I've observed
hybrid forms in remnants as well as in seedlings propagated from remnant
collected seed. We took a conservative approach and isolated congeneric
species known to hybridize by the same distance as same species/different
sources.  Previously isolation between different species was only 15 feet,
regardless of potential to hybridize.

On Dec 24, 2016 1:08 PM, "Holmes, Clara (Parks)" <Clara.Holmes at parks.nyc.gov>
wrote:

>
> Happy Holidays Everyone,
>
> One of our partners is looking for information regarding isolation
> distances of species. They are trying to set up founder production of the
> following species and one of the sites a grassland is being installed near
> by, potentially compromising the ability to grow many of these species.
> They also want to be sure any hybridization is not occurring among genera
> ie. Euthamia, Lespedeza and Solidago. If anyone has information regarding
> these species it would be greatly appreciated!
>
> Euthamia spp.
> Solidago Spp.
> Schizachyrim scoparium
> Panicum virgatum
> Andropogon gerardii
> Sorghastrum nutans
> Tridens flavus
> Eragrostic spectablitis
> Ionactus linerifolius
> Chrysopsis mariana
> Lespedesa spp.
>
> Cheers,
> Clara
>
> Clara Holmes
> Seed Collection Coordinator
>
> T 718.370.9044 ext. 300 <(718)%20370-9044>
> F 718.370.0932 <(718)%20370-0932>
> E Clara.Holmes at parks.nyc.gov
> E cholmes at marsb.org <Clara.Holmes at parks.nyc.gov>
>
>
>
> *Mid-Atlantic Regional Seed Bank *Greenbelt Native Plant Center
> 3808 Victory Boulevard
> Staten Island, NY 10314
> www.marsb.org
> @_MARSB <https://twitter.com/_MARSB>
>
>
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