The Lady Slipper newsletter, and now blog, of the Kentucky Native Plant Society has been published since the Society’s founding in 1986. We occasionally feature an article from a past issue. In this article from 2011, KNPS Board Member David Taylor, discusses one of Kentucky’s most widespread milkweed, common milkweed (Asclepias syriaca). This article ran in Vol. 26, No. 3. If you would like to see these and other past issues, visit the Lady Slipper Archives, where all issues from Vol. 1, February 1986 to Vol. 39, 2024, can be found.

Kentucky’s Common Milkweed (Asclepias syriaca L.)

By David Taylor, US Forest Service

Common milkweed is a perennial forb that spreads by means of rhizomes and seed. It is one of about 115 species that occur in the Americas. Most species are tropical or arid land species. Plants may occur as a few individuals, but once established, form small to large colonies. Individual plants range from 1 to 2 m (~ 3 to 6 ft) tall. Leaves are elliptic to ovate to oblong and somewhat thick. Mature leaves are 15-20 cm (6-8 in) long and 5 to 9 cm (~ 2 to 3.6 in) wide, with a prominent midvein. The underside of the leaf is frequently finely pubescent. The stem is stout, usually simple, and green to black (see below) in color. When broken, the leaves, as well as stem and fruit, exude milky latex. Flowers are purplish to rosy pink to mostly white or even greenish and about 2 cm (0.75 in) long and 1 cm (0.4 in) wide. They occur in semi-spherical umbels (umbrella-like clusters) in the upper leaf axils. Flowers are somewhat complex in their structure, with structures not found in the average flower (see Cut Flower Exports of Africa – Asclepias). The flowers are strongly and sweetly scented. The fruits (pods), known as follicles, are formed from the union of multiple flowers. They are green, covered in soft spiky projections and are finely pubescent. When the seeds are mature, the follicle splits exposing the seeds. Each seed is equipped with a coma, a soft group of hairs. As the newly exposed seeds dry, the hairs of the coma expand allowing the seed to catch a ride on the wind. When broken, the leaves, as well as stem and fruit, exude milky latex.

The Lady Slipper newsletter, and now blog, of the Kentucky Native Plant Society has been published since the Society’s founding in 1986. We occasionally feature an article from a past issue. In this article from 2004, Alan Weakley, looks at the taxonomic changes in the 1990s that moved American asters out of the Eurasian genus Aster into several American genera . This article ran in Vol. 19, No. 3. If you would like to see these and other past issues, visit the Lady Slipper Archives, where all issues from Vol. 1, February 1986 to Vol. 39, 2024, can be found.

The Curious Case of the Disappearing Asters . . .

by Alan Weakley

Reprinted with permission of the author from the North Carolina Botanical Garden Newsletter 32(2). March-April 2004.

Would an aster by any other name look as showy?

One dark and stormy night in 1994 I was awakened from a deep sleep by a loud thump. Creeping carefully down the stairs, I discovered to my astonishment that a large bouquet of Aster on the dining table had disappeared! In its place was a cornucopia of composites, including Symphyotrichum, lonactis, Eurybia, Sericocarpus, Doellingeria, Ampelaster, and Oclemena! Once again, a plant taxonomist had struck in dark of night, taken a simple two- syllable genus with the same English common name, and replaced it with a handful of four- and five-syllable Latin tongue-twisters. Whatever can we do about such things?

The classification of living things is based on the principle that each taxonomic unit (for instance the Composite or Aster Family, the genus Aster, or a species) groups together things that are most closely related to one another, and that the group should not also contain things which are disparate, unrelated, or more closely related to another group.

The concept of the genus Aster has had a long history of controversy and confusion. Asa Gray, the most influential nineteenth-century North American botanist, struggled with Aster at all levels, from its circumscription (what to include in it), to the taxonomy of the component species. Late in his life, he wrote:

“I am half dead with Aster. I got on very fairly until I got to the thick of the genus, around what I call the Dumosi and Salicifolia. Here I work and work, but make no headway at all. I can’t tell what are species and [sic] how to define any of them …. I was never so boggled …If you hear of my breaking down utterly, and being sent to an asylum, you may lay it to Aster, which is a slow and fatal poison.”

The Lady Slipper newsletter, and now blog, of the Kentucky Native Plant Society has been published since the Society’s founding in 1986. We occasionally feature an article from a past issue. In this article from 2010, the late Tom Barnes, wildflower photographer and former president of Kentucky, takes an in-depth look at the gentians (Gentianaceae family) . This article ran in Vol. 25, No. 4. If you would like to see these and other past issues, visit the Lady Slipper Archives, where all issues from Vol. 1, February 1986 to Vol. 39, 2024, can be found.

Gentians: All Fall Color is Not Red, Yellow and Orange

Thomas G. Barnes, Ph.D.
Extension Wildlife Specialist, Department of Forestry, University of Kentucky

Fall is the time of the year when the leaf peepers begin their road trips across the Commonwealth in search of reds, yellows, oranges, and other colors in the tree canopy. For wildflower enthusiasts it is a time of the year when they think of other activities since the goldenrods and asters are done flowering and the drabness of winter is quickly approaching. For those who do love searching for unique wildflowers, like so many do for our native orchids, this is the time of the year to search for fall flowering members of the gentian family, those that typically have beautiful blue flowers. When you think of the rarity of the native orchids found in Kentucky, approximately 38% are listed as rare, special concern, threatened or endangered. Of the fall gentians, 68% fall in those same categories. So if looking for rare plants is your venue, then the fall gentians are an excellent group to focus on. I hope to share with you some information about gentians in general and then which species can be found in Kentucky.

Jeff Nelson, KNPS President

Over the last several years, we have seen an explosion of interest in the growing of native milkweed plants (Asclepias genus), largely driven by the plight of the iconic monarch butterfly (Danaus plexippus). As most of us are aware, monarch caterpillars only host on milkweeds. Without milkweed leaves to feed on, monarch caterpillars cannot not survive.

Asclepias is a genus of herbaceous, perennial, flowering plants known as milkweeds, named for their latex, a milky substance containing cardiac glycosides termed cardenolides, exuded where cells are damaged. Most species are toxic to humans and many other species, primarily due to the presence of cardenolides.

The Lady Slipper newsletter, and now blog, of the Kentucky Native Plant Society has been published since the Society’s founding in 1986. We occasionally feature an article from a past issue. In this article from 2005, Robert Paratley, Curator, University of Kentucky Herbarium, takes an in-depth look at the dogbane family, Apocynaceae. This article ran in Vol. 20, No. 1. If you would like to see these and other past issues, visit the Lady Slipper Archives, where all issues from Vol. 1, February 1986 to Vol. 39, 2024, can be found.

The world of the dogbane family Apocynaceae

Robert Paratley
Curator, University of Kentucky Herbarium

Indian-hemp or dogbane, Apocynum cannabinum, is a tall, branching perennial found in most parts of Kentucky. It is very common in old fields, roadsides and other disturbed habitats, but is not particularly conspicuous in flower, with small greenish-white flowers whose petals are fused into a small urns hape. Indian-hemp is more conspicuous in fruit, where the two parts of the pistil separate at maturity and elongate into narrow, dark, long-pointed follicles (pods). These are filled with numerous light, tufted seeds adapted to catch the wind, making it an effective seed disperser. Break the plant and the sap is milky white. Another species, the spreading dogbane (Apocynum androsaemifolium), is similar but smaller than Indian-hemp and is widespread in northern U.S. It is listed as rare in Kentucky. Both species are on any serious list of poisonous plants. Numerous cases of livestock poisoning have been recorded, although apparently no human cases are known. (Turner and Szczawinski, 1991).

Both are members of the Apocynaceae, a large, mostly tropical family of mostly woody members. This article will highlight the features of this complex, diverse family that barely gets a toehold in the temperate zone. The Latin genus name Apocynum was coined by Linnaeus. He combined two Greek roots, apo meaning “away” or “off”, and cyn meaning “dog” – a dog repellent. The common name echoes this idea. (Perhaps dogs found the scent of the European dogbane Apocynum venetum unpleasant and kept away from it.) Apocynum became the namesake genus for the family Apocynaceae, whose name is credited to the French botanist Antoine-Laurent de Jussieu in the early 1800s. Until recently, the concept of the family remained fairly consistent, including about 200 genera and 2,000 species (Cronquist, 1981). Recent research has expanded the concept of the family to include the milkweeds, which have traditionally been taught as a distinct but closely related family. Following older fashion, I will not discuss milkweeds here.

The Lady Slipper newsletter, and now blog, of the Kentucky Native Plant Society has been published since the Society’s founding in 1986. We occasionally feature an article from a past issue. In this article from 2005, David Taylor, KNPS Board Member, takes an in-depth look at bay starvine (Schisandra glabra), a rare native found in only two counties in Kentucky. This article ran in Vol. 20, No. 3. If you would like to see these and other past issues, visit the Lady Slipper Archives, where all issues from Vol. 1, February 1986 to Vol. 39, 2024, can be found.

Bay Starvine

By David Taylor

Kentucky’s flora includes some little known odd plants. Many of these are known only from a few sites. Some may be endemic to the state or be outliers of populations centered elsewhere. One of the plants in the latter category, bay starvine, is of particular interest to me. It is a high climbing vine (actually a liana, a woody vine) which throughout its range is associated with rich, sheltered sites. I was introduced to this species in Louisiana where it is known only from a few parishes (the Louisiana equivalent of county) in the southeastern part of the state. I saw it later in Mississippi and Kentucky.

Bay starvine, sometimes called magnolia vine or scarlet woodbine, is known to the botanical world as Schisandra glabra. An older name, Schisandra coccinea, is sometimes encountered. A variant of the generic name, Schizandra, is sometimes found in 19th and early 20th century literature. This species was long considered part of the Magnolia family, the Magnoliaceae or the Magnoliales (Small 1933; Correll and Johnston 1970). It, like magnolias, has simple flowers with multiple stamens and pistils, and appears to be beetle or fly pollinated. It has simple, alternate leaves, usually with scattered teeth along the margins. In general, it was considered a primitive species, closely related to magnolias. In recent years (see Vincent 1997), all species in the genus and another closely related genus of lianas were elevated to their own family, the Schisandraceae or Schisandra family. The family, while distantly related to the Magnoliaceae, is most closely related to another, the Illiciaceae, (Star Anise family) which also has a strong Old World distribution and an scattered southeastern United States distribution. The two genera, Schisandra and Kadsura, are Old World with the exception of bay starvine. The Old World species are Asian, found largely in China, Japan, Korea, Indonesia, Sumatra, Borneo, India, Myanmar, Philippines, and Thailand. There are 23 Asian species (plus several subspecies) of Schisandra, and 15 species of Kadsura. Two recent monographs (Saunders 1998, 2000) provide keys, descriptions and drawings for all species.