[APWG] Jewelweed
Wayne Vanderploeg
wvanderploeg at ameritech.net
Tue Jul 19 12:24:50 CDT 2011
Hello All,
I don't usually make comment to this group....I generally browse this list to
see what new issues are popping up. As a biologist/ecologist/naturalist/land
manager for 31 years in the Chicago area with the Forest Preserve District of
Cook County, I have seen this plant come and go. Deer do browse it heavily and
tend to prefer it over most other plants. It does well in disturbed areas where
the soil is rich, moist and semi shaded. I have always viewed it as sensitive
plant that is easily displaced by weeds and never thought of it as a problem
plant in the Chicago area. The fact that it is spreading prolifically in other
areas where it typically does not occur could be a symptom of a bigger problem.
I would expect it to disappear when those problems are discovered and solved.
Wayne Vanderploeg
________________________________
From: "Maze, Dominic" <Dominic.Maze at portlandoregon.gov>
To: Katie Fite <katie at westernwatersheds.org>; "apwg at lists.plantconservation.org"
<apwg at lists.plantconservation.org>
Sent: Tue, July 19, 2011 11:42:18 AM
Subject: Re: [APWG] Jewelweed
Jewelweed
Hi Katie et alia,
Impatiens capensis is, in my experience, a problematic species here west of
the Cascade Range in the Pacific NW. The densities of this sp. are pretty
amazing with the understory of riparian corridors often dominated by it. I’ve
been seeing more and more of it in the Willamette Valley and surrounding ranges
here in Oregon with seemingly little attention paid to it.
Interestingly, some land managers still consider this species native here on
the West Coast, probably due to confusion with our native, I.ecalcarata in some
older floras and field guides. Ed Alverson of TNC wrote a short comment in
reply to a posting on I.capensis at the Botany Photo of the Day website:
“Impatiens capensis is an introduced and invasive species in the Pacific
Northwest , west of the Cascades. Peter Zika addressed this issue in a 2006
paper, "The status of Impatiens capensis (Balsaminaceae) on the
Pacific Northwest coast", published in the Journal of the Torrey Botanical Club,
vol. 133 pp. 593-600. In fact, I. capensis is spreading into the habitats of the
uncommon native I. ecalcarata west of the Cascades, and the two species are
hybridizing. This has created a situation where the native species is
potentially being out-competed by both the introduced species and by their
hybrids. Zika has published another paper on the hybrid, which he has named
Impatiens x pacifica , see "Impatiens x pacifica (Balsaminaceae), a New Hybrid
jewelweed from the Pacific Northwest Coast of North America", Novon vol. 16, pp.
443-448, 2006.”
Add this spp. to I. glandulifera (a big problem) and I.balfourii (an escaping
species which may be a problem in the future), and we’ve got our hands full out
here with the touch-me-nots.
Dominic Maze| Invasive Species Coordinator
City of PortlandEnvironmental Services
1120 SW 5th Avenue, Room 1000
Portland, Oregon 97204
p: (503) 823-4899
f: (503) 823-5344
dominic.maze at portlandoregon.gov
________________________________
From:apwg-bounces at lists.plantconservation.org
[mailto:apwg-bounces at lists.plantconservation.org] On Behalf Of Katie Fite
Sent: Monday, July 18, 2011 5:46 PM
To: apwg at lists.plantconservation.org
Subject: [APWG] Jewelweed
Has anyone had any experience with jewelweed (Impatiens) native to the eastern
U. S. becoming weedy in valley marsh habitats in the intermountain West?
I see that jewelweed Impatiens capensis (orange jewelweed) is listed as a King
County (WA) “Weed of Concern”.
This species is shown as having a yellow flowered form, which is what we are
seeing.
http://www.kingcounty.gov/environment/animalsAndPlants/noxious-weeds/laws/list.aspx
Katie Fite
Western Watersheds Project
katie at westernwatersheds.org
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