[MAIPC] Unknown shrub Kolkwitzia perhaps

Fri Aug 11 06:09:39 PDT 2017

Tim Block did us a huge service and looked at the Morris Arboretum's collections of Philadelphus and Kolkwitzia to see if there were any leaf/stem traits that could distinguish between the two. Here’s what he came up with – and by this method it would seem that Mark’s specimens are more consistent with Philadelphus.

>From Tim:
Good morning, Norris:

The easiest way to tell Kolkwitzia from Philadelphus vegetatively is to look for the axillary buds.  The buds of Philadelphus are buried in the base of the petiole, while those of Kolkwitzia are readily evident (see photos).

Other than that, I can't see much in the way of consistently applicable characters.  But, this one appears completely consistent across all species of Philadelphus.  Of course, there is only one species of Kolkwitzia.

Tim

Timothy A. Block, Ph.D.
The John J. Willaman Chair of Botany
Morris Arboretum of the University of Pennsylvania
100 East Northwestern Avenue
Philadelphia, PA 19118

Mark’s specimens can be seen here:
http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20170807/a780011e/attachment-0002.jpeg
http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20170807/a780011e/attachment-0003.jpeg

—

Norris Z. Muth, Ph.D.

Associate Professor, Biology

Office: 814-641-3632 | 1054 VLB

Juniata College

1700 Moore Street

Huntingdon, PA 16652

muthlab.org<http://muthlab.org> | NativePlantAdvocate.org<http://NativePlantAdvocate.org>

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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