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Brunnichia is a genus of flowering plants in the family Polygonaceae. It includes a single species, Brunnichia ovata, commonly known as redvine, American buckwheat vine or ladies' eardrops, a woody vine native to the central and southeastern United States.
Description
Brunnichia ovata is made up of an alternate leaf arrangement of its simple leaves. It is regarded as deciduous and the blades of its leaves are ovate or having an oval shape. Its leaves can range anywhere from 2 to 5 inches in length and its petioles are usually short. The flowering of the Brunnichia ovata species is typically seen from June to July and they are greenish in color. The fruit of the species is coined by its common name, “ear-drops” due to its appearance of hanging earrings. The stems shows proximal portions to be woody and the distal portions of the shoots to be herbaceous. Hence the species is regarded as a semi-woody vine. The optimum temperature found for germination of the species is 35 °C in both soil and Petri dishes. Below or above, 25 °C and 40 °C, respectively will yield no germination or emergence. Furthermore it requires altitude ranges of 0 to 200 meters and can grow up to 40 feet tall.
Geographic distribution
Brunnichia ovata is a native vine to North America. It is native to coastal plains of the south-central and southeastern United States, ranging from Texas to Alabama, as far north as southern Illinois, and eastward to Georgia. Plants grow near riverbanks, the perimeters of lakes, wet woods and thickets.
Uses
In January 2019, the largest honey producer in Arkansas announced they were closing production due to damage to native wildflowers from the herbicide
Redvine species are a pest when they grow within crops; for example, Brunnichia ovata is a significant problem in soybean crops in the Mississippi Delta. It is an example for thigmotropism. Usually thigmotropism occurs when plants grow around a surface, such as a wall, pot, or trellis. Climbing plants, such as vines, develop that coil around supporting objects. Touched cells produce auxin and transport it to untouched cells. Some untouched cells will then elongate faster so cell growth bends around the object. Some seedlings also exhibit triple response, caused by pulses of ethylene which cause the stem to thicken and curve to start growing horizontally.
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