Taters for Breakfast

Recently I had observed that “something” was actually eating the air potato. At first I thought it was a caterpillar of some sort but, I should have known better by the pattern of munching on the leaf surfaces. Yesterday, while in the midst of my glee (spraying air potato with herbicide); I noticed what finds our invasive pest a tasty snack. Slugs!!!!

From little itty bitty guys to this considerable slimy monster, they were everywhere I looked. I don’t know much about slugs (identification requires that you take a closer look at their underside) and these guys could even be non native but, I have a soft spot for most things that move. So, a little of my joy in the herbiciding process was sapped when it was obvious that slugs aren’t all that found of glyphosate (Roundup). There is a pretty cool page on slug id from the University of Florida. Apparently Florida is pretty depauparete in slug fauna (only three native species) and we are in a constant battle to prevent new species from being introduced and threatening our agricultural industry. http://entomology.ifas.ufl.edu/creatures/misc/Florida_slugs.htm

A face only a mother could love…look at those cute little retracted antennae…the top two are for the eyes and the bottom serve as the nose…looks like the radula (scraping teeth in mouth) is hidden or retracted…the ribbed tissue in the middle is the foot and the fleshy surround is known as the mantle.

Oh no, it has wings!

Should you have come across this blog before you know that I am apt to wax poetic (or should that be quixotic) about my arch nemesis the air potato (Dioscorea bulbifera). Well just to add insult to injury, the air potato’s near relative has found its way to our little Back Woods. I give you the “winged yam” Dioscorea alata!

one little patch of D. alata in the Back Woods

And yes it has wings. They have extra tissue (wings) jutting out from the edges of their squared stems and petioles. This differs from the air potato which has smoother angled stems and petioles that are not as noticeably squared.

winged yam air potato

The elongated bulbils of the winged yam appear in pairs at the leaf axis and whereas the air potato bulbils appear in pairs or singularly and are rounded.

winged yam air potato

The leaves of the winged yam are heart shaped like the air potato but appear to me more elongated. The notable key difference between the species is that the winged yam leaves are opposite on the stem and the air potato leaves are alternate (appear singularly) along the stem.

winged yam

Interestingly, the winged yam twines counter clockwise around supports while the air potato twines clockwise around supports.

winged yam  air potato

Like its relative the air potato, the winged yam is a non native invasive exotic species and listed as a Category I species in Florida meaning; “These are invasive exotics which are altering native plant communities by displacing native species, changing community structures or ecological functions, or hybridizing with natives. This definition does not rely on the economic severity or geographic range of the problem, but on the documented ecological damage caused.” FLEPPC

The Florida Exotic Pest Plant Council (FLEPPC) has a nice id sheet on winged yams found here: http://www.fleppc.org/ID_book/Dioscorea%20alata.pdf

Plant Profile: Partridge pea

Common Name: partridge pea, sleeping plant

Scientific Name: Chamaecrista fasciculata (Michx.) Greene

Form:  Annual legume (bean)

Height/Spread: 1-3 ft tall, spread similar to height.

Leaves: Alternate, evenly pinnately compound olive green leaves with small (up to 2cm) spine tipped leaflets. Leaflets fold along the rachis when touched or in response to nightfall. Two permanent stipules and a small disc shaped extra floral nectary gland are at the base of each petiole.

Stems: Smooth and green becoming reddish brown more haired with maturity.

Flowers: Bright yellow 5 petaled flowers with red markings at the base of the petal. Stamens are sometimes red in color. One petal often folds in over stamen and anther. Flowers arise from leaf axil with the stem.

 

Fruit and Seeds: Flat 2-3 inch long legume (bean pod) producing dark brown flattened seeds.

Habitat: Partridge pea is characteristic of dry upland plant communities. Can be found along the edges of disturbed sites.

Range: Throughout the Eastern and Central United States.

Shade Tolerance: Somewhat tolerant.

Fire Tolerance: Habitat and establishment may be improved through fire.

Wildlife Use: Partridge pea is important as the larval host plant of several sulphur butterflies (Giant Cloudless, Little yellow, and Orange Sulphurs). (Check out Kristen’s Butterfly blog Lepcurious for a post on other host plants for sulphur butterflies) Seeds of partridge pea are important part of the diet of quail particularly in the Midwest. The plant as a whole is preferred white tailed deer browse.

Cloudless Sulphur larvae

Field ID: Partridge peas are in bloom throughout the summer months and are easily recognized by their bright yellow flowers and small pinnate foliage.

Information: Previously known as Cassia fasciculata, Chamaecrista fasciculata is a nitrogen fixing legume. It is commonly planted for soil stabilization and improvement projects. The small nectar gland at the base of each leaf attracts ant species which may in turn protect the plant from herbivores and plant damaging insects. Partridge pea has a long history in Native American culture as a medicinal plant but; partridge pea can be a purgative in humans and is toxic to livestock. So once again, let’s leave this one for the birds, bees, and butterflies.

References and Additional Resources:

• Austin, Daniel F. Florida Ethnobotany. Boca Raton: CRC Press. 2004
• Miller, James H., and Karl V. Miller. Forest Plants of the Southeast and Their Wildlife Uses. Athens and London: University of Georgia Press. 2005
• Taylor, Walter K. The Guide to Florida Wildflowers. Dallas: Taylor Publishing Company. 1992
• NPIN Native Plant Database Chamaecrista fasciculata
• Illinois Wild Flowers Chamaecrista fasciculata
• USDA Plants Profile Chamaecrista fasciculata