Coefficients of Conservation (CC) for the plants

of the ORWRP

  1. Osage orange – 0
  2. American jumpseed – 3
  3. Black walnut – 5
  4. Pawpaw- 6
  5. Smooth carrion flower – 4
  6. Pokeweed – 1
  7. Low smartweed – 5
  8. American bladdernut – 6
  9. Amur honeysuckle – 0
  10. Canada goldenrod – 1
  11. Orange Coneflower – 6
  12. Callery Pear – 0
  13. Catalpa – 0
  14. Common Milkweed – 1
  15. Fly honeysuckle – 8
  16. Graybark grape – 4
  17. Giant Ragweed – 0
  18. Great blue lobelia – 3
  19. Jerusalem Artichoke – 3
  20. White snakeroot – 3


Lowest CC Native Plants

Osage orange, Maclura pomifera. The osage orange tree has a coefficient of conservation of 0. The osage orange tree has very distinctive fruits, called hedge apples, which are yellow-green and wrinkly. According to this website, Native Americans used the wood to make archery bows, which gives rise to this tree’s alternative name: Bowwood.

Pokeweed, Phytolacca americana. Pokeweed has bright pink stems, which are key for identifying it. The stems and roots are poisonous, however, the berries contain a red dye which is used to color wines, cloths, candies, and paper, according to this website.

Canada Goldenrod, Solidago canadensis. The Canada goldenrod has a coefficient of conservation of 1. This plant has clusters of very small, yellow flowers which are quite beautiful. According to this website, Canada goldenrods are allelopathic to sugar maple, which means in inhibits their growth by producing a chemical in the soil.

Common milkweed, Asclepias syriaca. Common milkweed also has a CC of 1. This plant has oval shaped leaves and distinct pods as fruits. According to this article, common milkweed was used by the Meskwaki to induce temporary sterility. They would prepare a drink by boiling dried, crushed milkweed and 3 jack-in-the-pulpit rhizomes. This was then drank at a rate of 1 cup per hour as a means of temporary contraception.

Highest CC Native Plants

American Bladdernut, Staphylea trifolia. The American bladdernut has a CC of 6. This woody shrub has a very distinct fruit (a panicle) that is papery and resembles a bladder. A sweet, edible oil can be extracted from the seeds and used in cooking, according to this website.

Fly Honeysuckle, Lonicera canadensis.The fly honeysuckle has a CC of 8. The plant has small, red fruits that grow in twos. According to this website, the bark can be used as a sedative.

Pawpaw, Asimina triloba. The pawpaw tree has a CC of 6, and has relatively large leaves with a distinct smell. It also grows large, edible fruits as shown in the picture. According to this article, opossums, squirrels, foxes, raccoons, and birds (and ENR students) all enjoy eating the pawpaw fruits.

Orange Coneflower, Rudbeckia fulgida. The orange coneflower has a CC of 6. This flower has a head inflorescence with yellow ray flowers and black-brown disk flowers. The genus name honors Olof Rudbeck, a Swedish botanist who founded Uppsala Botanic Garden in sweden.

Invasive Species

Giant Ragweed, Ambrosia trifida. I found this invasive giant ragweed at my site. As you can see in the pictures, the plant has very distinct, deeply lobed leaves. According to this website, ragweed grows very quickly and, if left alone, can grow up to 17 feet.

Low Smartweed, Persicaria longiseta. This invasive plant was also found at my site. The low smartweed has very small pink flowers and is a raceme inflorescence. According to this website, low smartweed (or creeping smartweed) is native to southeast Asia and it’s now found primarily in disturbed areas of cities.

Amur honeysuckle, Lonicera maackii. This amur honeysuckle was also found at my site. It has small red fruits that grow in twos. Native to China, Japan, Korea, and parts of Russia, this plant was imported into the US in the late 1800’s. However, it has since spread far outside where it was originally planted, according to this website.

Northern Catalpa, Catalpa speciosa. This northern catalpa was also found at my site. It has large, heart-shaped, opposite leaves. This invasive plant is known to have diuretic properties according to this website.

Substrate Associated Species

Redbud, Cercis canadensis. According to the Geobotany article, the distribution of redbud trees is generally limited to limey substrates and limestone. This plant was found near the Olentangy wetlands, which are considered to be in western Ohio which is underlain with limestone. The location of this plant is consistent with the article.