Mason Heberling

​This specimen of winter creeper (Euonymus fortunei) was collected on January 31, 2012 along the Monongahela River in Fayette County, PA by Allison Cusick.  Allison Cusick is a current Research Associate in the Section of Botany at the museum.  He can be frequently found in the Carnegie Museum herbarium.  He has a unique wealth of knowledge on plants, herbaria, botanical history, and more.  He authored three books and more than 50 scientific papers on the flora of eastern North America. Before retiring, he was the Chief Botanist for the Ohio Department of Natural Resources.  He continues to collect today, and many thousands of his specimens can found at herbaria across the country. 
 
Note the label on this specimen reads “Cusick, A.W.  37174”  The number following a collectors name is known as the...you guessed it... collector number (surprise!).  The collector number is the number assigned to a specimen by the collector.  It is common for several specimens to have the same collector number, if they are from the same individual or species in the same location on the same day (“duplicate specimens”).  Unfortunately, there are no universal rules on how collector numbers are used or assigned.  Collector numbers primary use is so the collector and/or others using the specimen can go back to the collector’s field notebook for additional information on the specimen.  Collector numbers are different from specimen numbers (which are assigned by the herbarium, such that every specimen has a unique ID for reference).  Most collectors number their specimens chronologically in order they were collected (but not always), but some collector numbers consist of dashes and/or letters, too. 
 
Anyway, what I’m getting at is that this specimen (Cusick 37174) suggests Allison has collected AT LEAST over 37,000 specimens.  The number is actually higher than that, with duplicates and an additional 8 years of collecting.  Not that numbers are everything, but Allison’s contribution to the herbarium record is clearly impressive and impactful.
 
Ok, now back to the plant!  Winter creeper (Euonymus fortunei), native to Asia, is commonly planted in Pennsylvania and many other places, and unfortunately has also spread to become invasive.  It is still commonly planted.  It is a woody vine that climbs trees, but also is a thick ground cover.  It has leaves that persist through the winter, with attractive fruits.  Despite those advantages, it can impact native species and habitats as an invasive species, and therefore, should not be planted.
 
Find this specimen and more here: http://midatlanticherbaria.org/portal/collections/individual/index.php?occid=12134036&clid=0

A bittersweet specimen, in more ways than one...  

This specimen of American bittersweet (Celastrus scandens) is the most recent record of the species in Allegheny county, Pennsylvania.  It was collected on November 11, 1940 by Ellen Mason on "railroad property" in Thornburg, just west of the city of Pittsburgh. 

Can American bittersweet be found in Allegheny county?  It has largely been taken over by the invasive Oriental bittersweet from East Asia. The main differences between the two species are leaf shape (invasive species has more rounded leaves, native species are more elongated) and fruit (invasive species has fruit all along base of many leaves, whereas the native species has clusters of fruit at the end of each branch, as seen in this specimen).  

Oriental bittersweet (Celastrus orbiculatus) really didn't become prevalent in our area until a few decades ago.  But it sure it prevalent now.  It is also said to hybridize with the native American bittersweet, probably further swamping out the native.

American bittersweet has beautiful orange/red fruits that hang on into fall/winter long after their leaves have dropped.

Keep a look out for American bittersweet.

Not all bittersweet vines are invasive to Pennsylvania. This specimen was collected on June 14, 1965 by botany curator Leroy  Henry  in Clearfield county,  along  Rt 969. American bittersweet (Celastrus scandens) is a woody vine that  blooms in June, which turn to beautiful clusters of orange/red fruit in late summer/fall.  The species is native to eastern USA, found along open thickets/edge of woods.

American bittersweet (Celastrus scandens) might be easily  confused with the much more common Asian bittersweet (Celastrus orbiculatus).  There are two major visual  differences between the species: 1) flower/fruit --  native species has single terminal cluster of many flowers/fruits at tips of branches, whereas the invasive has flowers/fruits at axils of leaves (where leaves connect to stem; and 2) leaves -- native  species' leaves are more elongate, whereas the invasive species' leaves are more round, often even circular ('orbiculate').

American  bittersweet is no longer common in Pennsylvania, most likely taken over by the closely  related Asian bittersweet.   Asian bittersweet  is a relatively newer addition to the  flora of Pennsylvania, not showing  up  in  western PA and  the  Pittsburgh region until  the 1980s.  Given its abundance and distribution throughout the region  now,  it is hard to fathom it was not present only several decades ago.

Research over the past decade has shown that the invasive species hybridizes with the native, likely contributing to  the decline  of the native American bittersweet.

Keep a look out for American bittersweet in our region.  (I have  not  seen it in Allegheny county, although we have historic  records)

This specimen image is now publicly available online:
http://midatlanticherbaria.org/portal/collections/individual/index.php?occid=12131436&clid=0

This is a special specimen.  The Carnegie Museum herbarium is full of specimens of scientific and historical importance.  And this is a notable one, collected in June 1830 by William Darlington in West Chester, Pennsylvania.  William Darlington (1782-1863) was an important figure in the history of Pennsylvania botany. Darlington was a physician, politician (US House of Representatives 1815-1823),  and as  you might guess – a botanist!  At the University of Pennsylvania, Darlington studied botany under Benjamin Smith Barton, a well-known botanist who also trained Meriwether Lewis (of the Lewis & Clark Expedition). Darlington wrote several He spent most of his life in West Chester, PA. He wrote some of the earliest botanical works, including a flora of Chester County in 1826 and others on agriculture.  Many of his specimens are among the earliest documentation of Pennsylvania’s flora and are preserved in the William Darlington herbarium at West Chester University.
 
This particular specimen is of the native shrub Euonymus americanus, commonly called “strawberry  bush.”  Despite the name, it is not related to strawberries, but in the bittersweet/spindle family, Celastraceae.  You may recognize some similarities with the related species from East Asia, burning bush  (Euonymus alatus), which is commonly planted for its bright red fall color (around Cathedral of Learning in Pittsburgh, and many other places).  However, burning bush should not be planted, as it is invasive, spreading into natural areas.
 
In the Carnegie Museum herbarium, there are 62 specimens collected by Darlington between 1828 and 1840, mostly from Chester County, PA. 
 
How’d some of Darlington’s specimens end up at the Carnegie Museum?  This specimen was part of Jacob Wolle’s personal collection, who was the grandfather of William Holland, the first director of the museum.
 
This specimen image is now publicly available online: http://midatlanticherbaria.org/portal/collections/individual/index.php?occid=12131484&clid=0
 
Read more about  Darlington and other influential figures in the history of Pennsylvania botany at Herbarium World: https://herbariumworld.wordpress.com/2017/07/10/william-darlington-and-the-pennsylvanica-botanical-circle/

Even though it was collected in Japan, this specimen might look familiar in Pennsylvania. This specimen of wintercreeper (Euonymus fortunei) was collected by M. Togashi in Japan in 1985. Native to East Asia, wintercreeper (also called Fortune’s spindle or climbing euonymus) was introduced to North America in 1907 for use as a ground cover.  In fact, it can be found just outside the Carnegie Museum, around the parking garage.  It can escape cultivation, to establish and become naturalized (sometimes invasive) in the Eastern United States.  Wintercreeper is a fast-growing woody vine which has evergreen leaves.  Wintercreeper is recognized as invasive by the Pennsylvania Department of Conservation and Natural Resources (PA DCNR), with potential to cause ecological harm in natural areas (link).
 
Herbarium specimens are valuable resources to study invasive species -- not only to monitor changes through time (since introduction) and to track its spread across the US, but also to compare to populations growing in the native range.  Much untapped potential in herbaria worldwide for understanding species invasions.

Stumbled upon this neat little book from 100 years ago in the Botany library, which promotes the use of this plant as an ornamental.  The book was published in 1917, ten years after wintercreeper was introduced to the US.  Many states (including PA) now recognize this species as problematic or having the potential to become invasive.  [note: Evonymus radicans is a synonym for Euonymus fortunei var. radicans]

Below: Euonymus this morning outside the museum.  Probably not much photosynthesis happening this winter morning, given it is 0 °F (feels like -18°F​)!

Collected on this day in 1935, this eastern wahoo (Euonymus atropurpureus) specimen was found near Connellsville Pennsylvania by John Franklin Lewis.
Eastern wahoo is native to midwestern states and parts of Pennsylvania.