[MAIPC] Unknown shrub Kolkwitzia perhaps

Thu Aug 10 17:00:39 PDT 2017

I’ve never seen Kolkwitzia – but looking up images of the leaves I can’t see how to easily tell the difference between that and Philadelphus. There seem to be some subtleties about how acuminate the leaf tip is, but it doesn't seem obvious to me – the venation, teeth, and arrangement seem frustratingly similar.

I wonder if anyone has a good tip on how to use leaf or stem characters for those two look-alikes. The fruits/flowers on the other hand would be dead give aways.

—

Norris Z. Muth, Ph.D.

Associate Professor, Biology

Office: 814-641-3632 | 1054 VLB

Juniata College

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From: <Foster>, Donna M -FS <donnamfoster at fs.fed.us<mailto:donnamfoster at fs.fed.us>>
Date: Wednesday, August 9, 2017 at 4:10 PM
To: Mark Frey <runcator at gmail.com<mailto:runcator at gmail.com>>, Art Gover <aeg2 at psu.edu<mailto:aeg2 at psu.edu>>
Cc: "maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>" <maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>>
Subject: Re: [MAIPC] Unknown shrub Kolkwitzia perhaps

I say it is closest to Kolkwitzia amabilis per Michael Dirr (although I have never seen it either). Looks like a Philadelphus in the first photo, but definitely not per the second photograph. It’s woody so I doubt it is a Persicaria.

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From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Mark Frey
Sent: Monday, August 07, 2017 8:46 AM
To: Art Gover <aeg2 at psu.edu<mailto:aeg2 at psu.edu>>
Cc: maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>
Subject: Re: [MAIPC] Unknown shrub Kolkwitzia perhaps

Thanks all - I am convinced!

On Mon, Aug 7, 2017 at 8:41 AM, Art Gover <aeg2 at psu.edu<mailto:aeg2 at psu.edu>> wrote:
I'm with Norris.  Mockorange.

Be well.

Art

Penn State Wildland Weed Management
(814) 863-9904

Sent from my phone.

> On Aug 7, 2017, at 08:37, Muth, Norris (MUTH) <MUTH at juniata.edu<mailto:MUTH at juniata.edu>> wrote:
>
> Looks a bit like mock orange.
>
> NZ Muth
> Associate Professor of Biology
> Juniata College
>
>
>
>> On Aug 7, 2017, at 8:30 AM, Mark Frey <runcator at gmail.com<mailto:runcator at gmail.com>> wrote:
>>
>> All
>>
>> I saw this shrub yesterday and I can't figure out what it is. I first thought it was Deutzia scabra but the leaf teeth don't look right. Another option is Kolkwitzia amabilis - it has been on my radar but I don't think I have never seen that plant in person.
>>
>> It is opposite, ovate, up to 3 inches long, with a few sparse teeth, long tip and with arching stems.
>> The specimens I saw were no taller than 2 feet. However, it is an area that may have been recently mowed.
>>
>> Any tips would be much appreciated.
>>
>> Mark Frey
>> <IMG_1026.JPG>
>> <IMG_1027.JPG>
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