From The Lady Slipper Archives: New England Aster: 2010 Wildflower of the Year

The Lady Slipper newsletter of the Kentucky Native Plant Society has been published since the Society’s founding in 1986. With this article, we will begin to occasionally feature an article from a past issue. This one, about one of Kentucky’s loveliest natives, the New England Aster, first appeared in the summer of 2010, Vol. 25, No. 2. If you would like to see other past issues, visit the Lady Slipper Archives, where all issues from Vol. 1, No. 1, February 1986 to Vol. 34, No. 1, Winter/Spring 2019 (after which we moved to this blog format) can be found.

The author, Mary Carol Cooper, left a huge legacy to the native plant community when she passed in 2016. In almost every native plant gathering, her name is mentioned and a moment is given over to appreciate her knowledge, which she freely shared. Her passion led many of us to our love of natives; she was a mentor and friend to many of us.

New England Aster: 2010 Wildflower of the Year

By Mary Carol Cooper, Salato Center Native Plant Program Coordinator

The Wildflower of the Year is chosen based on the number of nominations it receives and this year more wildflower enthusiasts statewide voted than ever before! They chose New England Aster (Symphyotrichum novae-angliae) as the Salato Native Plant Program Wildflower of the Year for 2010. Aster comes from the Greek word for “star.” It describes the star-like form of the flower. Other familiar words using “aster” are astronomy, astrology and astronaut. According to Greek legend, the aster was created out of stardust when Virgo (the maiden Astraea, goddess of innocence and purity) looking down from heaven, wept. Asters were scared to all the gods and goddesses and beautiful wreaths made from the blossoms were placed on temple altars on very important festive occasions. Known in France as “eye of Christ” and in Germany as starworts, asters were often burned to keep away evil spirits. A hodgepodge of asters was thought to cure the bite of a mad dog. Shakers used the plant to clear their complexions and ancient Greeks used it as an antidote for snakebites and to drive away snakes. Virgil believed that boiling aster leaves in wine and placing them close to a hive of bees would improve the honey. Native Americans found many uses for asters, from treating skin rashes and earaches to stomach pains and intestinal fevers. Nerve medicines and cures for insanity were made from some asters and others were eaten as food. Some were smoked in pipes as a charm to attract game, especially deer. Today there are no medical uses for asters.

New England Aster, photo by Thomas Barnes

The genus Aster has recently undergone a name change due to close study using DNA testing and other techniques. There are about 150 flowering plants in North America traditionally placed in the aster genus. About 50 of them are considered common and widespread. Now there is only one species left with the name Aster. The other species have been given several tongue-twisting generic names. For the botanist, renaming of the asters brought accuracy and order. For the layperson, it removed some wonderfully colorful names and replaced them with unspellable and unpronounceable names! Aster novae-angliae was translated as “star of New England” and now as Symphyotrichum novae-angliae, it is literally “fused hairs of New England.” The word Symphyotrichum was created in 1832 to describe the hairs on the seeds of a European plant.

New England Aster is an erect perennial that grows to a height of 2’ to 6’ tall with a stout root crown or thick, short rhizome and clustered stems, usually with spreading hairs. The leaves are alternate, sessile, entire, lanceolate, 1” to 4” long with pointed lobes at the base that conspicuously clasp the stem. The ray flowers range from violet, rose, or magenta and are very showy. The disk flowers are yellow. This aster is one of our largest and showiest asters. There can be from 40 to 80 ray flowers on a head! These asters bloom from August to October and are a critical late-season nectar plant for butterflies, especially the Monarch, that stock up for their long migration to Mexico. New England Asters are found in mesic to wet open woods and fields across Kentucky. They prefer average to moist soil and full sun. Not only are the New England Asters critical for Monarch butterflies, it is the host plant for the Pearl Crescent and one of the host plants for the Saddleback Caterpillar Moth. Several game birds, including the wild turkey, a few songbirds, including the tree sparrow, and small mammals, such as the chipmunk and white-footed mouse, feed on the leaves and seeds. Work plantings of New England Aster into your fall landscape. Use them singly or in small groups in the rear of a sunny border. They look beautiful with our native sunflowers, goldenrods, mistflower and rose mallow. They are also perfect for rain gardens as they thrive on moist to dry soil. They are easy to naturalize in roadside ditches, road banks, and open grassy areas. A sunny site where soil remains moist throughout the season is also ideal. Asters have always been recognized as decorations. The flowers of most species last several days after being picked and put into vases, so what better than New England Asters in beautiful fall arrangements along with other fall bloomers.

Ecological Effects of Amur Honeysuckle Infestations

By David D. Taylor

This article expands on Invasive Plant Corner – Bush Honeysuckle (Lonicera Spp.), in the April 2020 issue.

Amur honeysuckle (Lonicera maackii) is the most widespread and arguably the most invasive of the nonnative invasive honeysuckle shrubs in Kentucky. Jeff Nelson’s article on Amur honeysuckle provides a general overview of the species. This article provides some details as to why this species is so invasive and why is an ecologically undesirable species.

Amur honeysuckle, native to central and northeastern China, Japan (rare), Korea, and far eastern Russia, occurs as an understory shrub in open hardwood and mixed hardwood-conifer forest consisting of oaks, elms and other hardwoods and fir, spruce and hemlock. It is also known from and more common in riparian and scrub communities (Luken and Thieret 1996). It grows as scattered individual shrubs or small clumps, not unlike viburnums do in Kentucky. Large, dense stands do not typically occur, but in open, riparian areas it can be weedy. In its native range, individuals typically do not exceed 4 inches diameter and 20 feet tall (Yang et al. 2011). In Kentucky, the species is often an understory shrub in open forest, but forms dense thickets at forest edge, along fence rows and in open areas. It grows larger here as well, to 6 inches diameter and 30 feet tall (personal observation).

Large Amur honeysuckle, two stems 5 inches or greater in diameter.
29 April 2020. 
Photo by David Taylor

This shrub leaves out early in spring, often breaking bud in mid-March, long before native trees and shrubs. By mid-April of most years, leaves are fully expanded, and the shrubs are actively growing. In the fall, Amur honeysuckle typically senesces (leaves turn yellow and drop) in late October to mid-November, and sometimes not until early December. Native trees and shrubs typically break bud late March to mid-April and do not fully expand until early May. In eastern Kentucky, they are actively dropping their leaves by mid- to late October in most years. The extra 5-8 weeks of photosynthetic activity in the honeysuckle allows it to store additional energy giving it an edge over native species (McEwan et al. 2009). It is also somewhat tolerant of late freezes. Both promote its invasive nature.

Tall Amur honeysuckle, approximately 27 feet tall. 
29 April 2020. 
Photo by David Taylor

While Amur honeysuckle grows better in full sun (Luken 1995), it is known to survive in 1 percent of full sunlight in the heavy shade of trees (Luken et al. 1997a). The native spring flowering spice bush (Lindera benzoin) by comparison, requires about 25 % of full sun to survive (Luken et al. 1997a). Forest grown Amur honeysuckle under heavy shade tends to produce few stems which grow upward toward light specks. They tend not to have much branching, nor do they attain much diameter. In the open, individual shrubs produce numerous stems and branching is extensive. Maximum diameters are obtained in the open (Luken et al 1995a). Overtopped Amur honeysuckle shrubs respond with the production of long, upright stems that seek light. Honeysuckle in open forest may branch extensively and produce heavy shade.

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Native clover conservation in the Bluegrass: an agronomic perspective

Jonathan O.C. Kubesch, University of Tennessee

Clovers are an odd group of plants caught between agriculture and agronomy, especially in the Bluegrass. Agronomists and cattlemen find clovers important for their nitrogen contribution and nutritive value to livestock. Horse owners fear clover for the fungal pathogen behind slobbers. Wildlife managers use them for food plots. Of the roadside clovers, most came to Kentucky with settlers (Ball et al., 2015; Bryson and DeFelice, 2009). Those red and white clovers came with the tall fescue and Kentucky bluegrass. These species play an important role in Kentucky agriculture; however, the horse parks and cattle farms have replaced the natural ecosystems in the state (Noss, 2013; Campbell, 2014; Campbell, 2010).

In addition to these introduced species, Kentucky has three prominent native clovers: annual buffalo clover, running buffalo clover, and Kentucky clover (Vincent, 2001). Although collections of the native clovers have been made across Kentucky, it is really very uncommon to find these populations unless one knows where someone else has previously found it. It is unlikely that the reader will find these species in the local park or native area.

Annual buffalo clover (Trifolium reflexum), is spread throughout most of the eastern United States. The beautiful blooms have led to its potential as a horticultural species (Quesenberry et al., 2003). Of the native clovers, the genetics of the flowering in annual buffalo clover have been the most explored: red, white, and pink flowers (Quesenberry et al., 2003). At one point, it was favored over naturalized white clover in unimproved grazing lands (Killebrew, 1898).

Running buffalo clover (Trifolium stoloniferum) is a perennial species limited to the Ohio River Valley and Missouri. Plants spread on thick runners like strawberries. The species was investigated as a potential forage in the 1990s, and has been the subject of interest for herbivory dynamics in the eastern United States. The thick seed coat requires scarification in order for the seed to germinate (Kubesch, 2018; Sustar, 2017). Hoof action has been proposed as a driver in the ecology of the species, but a general disturbance regime seems necessary for the species to persist in the landscape (Kubesch, 2018). With some sandpaper and a few hours of free time, seed can be scarified. Running buffalo clover grows readily in the greenhouse.

Running buffalo clover in the greenhouse. Photo credit: Jonathan Kubesch
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Genus SCROPHULARIA in Kentucky:

Scrophularia marilandica (L.) and Scrophularia lanceolata (Pursh)

By Chris Bidwell 

Kentucky has two native species in the genus Scrophularia of the Scrophulariaceae/Figwort family: Scrophularia marilandica (L.) – Eastern/Late Figwort and Scrophularia lanceolata – Early Figwort (Pursh). S. marilandica is infrequent and primarily in Kentucky’s east-central and western counties. S. lanceolata is to be expected as it had been reported in Carroll County in 1986 but no further collections have since been reported. S. lanceolata is found in six of the seven states bordering Kentucky – it is not documented in Tennessee. Both S. marilandica and lanceolata are similar in description, habitats, and usages. Close inspection of the flower’s stamens is necessary to accurately identify which Scrophularia one is examining. S. marilandica has a purple-brown sterile stamen which is longer than wide while S. lanceolata’s sterile stamen is greenish/yellow and is wider than long. Minor differences as blooming times of June-October for S. marilandica and May-July for S. lanceolata can overlap and make identifying difficult from a distance. S. lanceolata has coarser, serrated, narrower leaves and larger seed capsules. These minor differences can be subject to interpretation which makes close examining of sterile stamens mandatory to identify the species. One reason Early Figwort (S. lanceotata) is overlooked may be due to the need to closely inspect flowers – distances/terrains may discourage one from getting to the plant to inspect accurately.

Scrophularia marilandica – Late/Eastern Figwort
Scrophularia lanceolata – Early Figwort

Both Early Figwort and Eastern Figwort are herbaceous dicot, perennials ranging from 3-8 feet tall with furrowed green stems. The stems do change to a woody texture and color in late summer and persist through winter. Opposite, petioled, and serrated leaves up to 8 inches long and 3.5 inches wide are triangular to lance shaped. Panicled irregular flower clusters are oppositely attached at end of the stems. Flowers are cylindrical/urn shaped 1/3- to 1/2-inch-long with an opening 1/3 of the flower’s length. The floral formula is K(4-5)Co(5)A(5) and 6(2). Each flower has a green calyx with 5 blunt teeth. The corolla with 5 rounded lobes with normally a dull green exterior and a predominantly brown-purple interior depicts Scrophularia marilandica while a reddish-brown exterior and yellow-green interior exist in Scrophularia lanceolata. It is important to realize however that the corolla color may vary/overlap in shades/mixes of green, yellow, red, and brown. The corolla’s 2 upper lobes that function as a hood keep rain/moisture from entering and diluting the rich nectar. The 2 lateral lobes help form the opening and the lower lobe curves downward serving as an excellent landing space for pollinating insects. Five stamens are present: 4 fertile and 1 non-fertile/sterile stamen. Scrophularia marilandica has a reddish/purple/brown infertile stamen while Scrophularia lanceolata’s stamen is yellow/green. These infertile stamen’ s color is the solid key to identifying the respective species. The infertile stamen is appressed against the upper interior posterior corolla. The 4 fertile stamens which may be fused are at the bottom of the anterior corolla. (See accompanying photos.)

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