Apios americana Medik.
Wet pine flatwoods (WPF-T).
Rare. Jun–Aug ; Jul–Sep . Thornhill 1179 (NCSC). [= RAB, Weakley]
General: Legume Family (Fabaceae). Groundnut (Apios americana) is a perennial herb from slender rhizomes with tuberous thickenings 1.3-4 cm (0.5-1.6 in) thick, and stems twining or climbing over other plants. The leaves are alternate, pinnately, egg-shaped, 2-10 cm (3/4-4 in) long, 1.8-7 cm (0.7-2.7 in) wide, and sometimes hairy. The flowers are in rounded clusters among leaves. Groundnut blooms from July to October. The flowers have 5 parts, the upper one round, white and reddish brown, the 2 side wings curved down and brown-purple, the lower 2 petals sickle-shaped and brownish red. The fruits are dry, straight or slightly curved, narrow, and 5-10 mm (3/16-3/8 in) long. The fleshy legume fruits are 6-12 mm (0.2-.5 in) in diameter and indehiscent (the fruit coils back after opening), usually with 1 seed. The seeds are oblong or square, dark brown, with wrinkled surfaces.
Groundnut, wild potato, Indian potato, wild sweet potato, American potato bean, wild bean, ground bean, hopniss, Dakota peas, sea vines, pea vines, pomme de terre, patates en chapelet, American potato bean
Regularity: Regularly occurring
Regularity: Regularly occurring
For current distribution, please consult the Plant Profile page for this species on the PLANTS Web site. Groundnut is distributed through the great prairie from Quebec to Minnesota, North Dakota, south to north central Colorado, Florida, and Texas.
From CNHP Wetland Guide 2012: Main Characteristics:
·Leaves odd-pinnately compound
Catalog Number: US 1810422
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Preparation: Pressed specimen
Collector(s): M. L. Fernald & B. H. Long
Year Collected: 1938
Locality: Sand beach of James River, below Sunken Meadow Beach., Surry, Virginia, United States, North America
- Isotype: Fernald, M. L. 1939. Rhodora. 41: 546.
Adaptation: Groundnut grows in wet meadows, low thickets, banks of streams and ponds, sloughs, moist prairie ravines, and moist soil in woodlands.
Propagation from Cuttings: Plant tubers two to three inches deep in the early spring (Kindscher 1992). After shoots establishment, mulch to stop competition from weeds and grass. Provide the young shoots with a traverse or other objectives upon which to climb. After one year of growth, several one inch-thick tubers can be harvested from each plant. Because of their vining nature, groundnut would be hard to grow on a field scale, and their annual yield appears to be quite low in comparison to other crops. Groundnut is difficult to cultivate mechanically, because each tuber can sprout and grow in the spring, filling in spaces between rows.
Flower-Visiting Insects of Groundnut in Illinois
(Bees suck nectar or collect pollen; observations are from Robertson)
Megachilidae (Megachilini): Megachile brevis brevis sn cp, Megachile mendica sn fq
Molecular Biology and Genetics
Barcode data: Apios americana
Statistics of barcoding coverage: Apios americana
Public Records: 3
Specimens with Barcodes: 5
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
Rounded National Status Rank: N5 - Secure
NatureServe Conservation Status
Rounded Global Status Rank: G5 - Secure
Please consult the PLANTS Web site and your State Department of Natural Resources for this plant’s current status, such as, state noxious status, and wetland indicator values.
Cultivars, improved and selected materials (and area of origin)
APAM is available from native plant nurseries within its range.
Relevance to Humans and Ecosystems
Ethnobotanic: According to Kelly Kindscher (1987), “groundnut is a common native food plant of temperate, eastern North America. Its distribution reaches west to the wet margins of prairies, where it was once used extensively by the Native Americans.”
Groundnut was a source of food among the Omaha, Dakota, Santee Sioux, Cheyenne, Osage, Pawnee, and Hidatsa (Gilmore 1913, Grinnell 1962, Matthews 1961, Wilson 1987). Groundnut was excavated from four Ozark bluff-dweller sites in Arkansas. The Ozark peoples are regarded as pre-Columbian (Beardsley 1939). Groundnuts “roots” were dug in the winter. The tubers were gathered all year but were best when harvested from late Fall through early spring. They were eaten raw, cooked, or dried and ground for flour. Some of the “roots” were boiled, peeled, and dried for storage. The seeds are cooked and eaten like peas in summer.
Groundnut was also an important food of New England colonists (Hedrick 1919). Once the colonists discovered the groundnut, they enacted a town law to prevent Indians from digging groundnut on English land. Groundnut tubers are a good source of carbohydrates and contain between 13 and 17 percent protein by dry weight, or about three times more than potatoes or any other widely used vegetable root (Yanovsky and Kingsbury 1938, Watt and Merrill 1963).
Horticultural: This plant is an attractive ornamental.
Apios americana, sometimes called the potato bean, hopniss, Indian potato, hodoimo, America-hodoimo, American groundnut,or groundnut (but not to be confused with other plants sometimes known by the name groundnut) is a perennial vine that bears edible beans and large edible tubers. Its vine can grow to 1–6 m long, with pinnate leaves 8–15 cm long with 5–7 leaflets. The flowers are usually pink, purple, or red-brown, and are produced in dense racemes 7.5–13 cm in length. The fruit is a legume (pod) 5–13 cm long. Botanically speaking, the tubers are rhizomatous stems, not roots. Its natural range is from Southern Canada (including Ontario, Quebec, and New Brunswick) down through Florida and West as far as the border of Colorado.
The tubers are highly palatable with culinary characteristics of a potato, although the flavor can be somewhat nuttier than a potato and the texture can be finer. Studies in rats suggest that raw tubers should not be consumed because they contain protease inhibitors whereas cooking destroys the protease inhibitors rendering the tubers safe to eat. Tubers contain roughly three times the protein content of a potato (16.5% by dry weight), and the amino acid balance is good with the exception of cysteine and methionine. The fatty acid content of tubers is approximately 4.2% to 4.6% with linoleic fatty acids predominating. Thirty-six percent of the fresh weight of a tuber is carbohydrate (primarily starch). The tubers are also an excellent source of calcium and iron. Calcium content is 10-fold greater than a potato and iron is 2-fold greater than a potato, although vitamin C was considerably less than a potato. In addition, the tubers appear to have numerous health promoting factors. Hypertensive rats that were fed powdered tubers as 5% of their total diet experienced a 10% decrease in blood pressure and also a reduction in cholesterol and triglycerides. It has been shown that the tubers contain genistein and other isoflavones that have various health benefits, including an anticarcinogenic function against colon, prostate, and breast cancer.
Cultivation in Japan and South Korea
The only place in the world today where American groundnut are commercially farmed in any significant quantities is in Japan. Before American groundnut was introduced to Japan, the people on the main island of Honshu and the Northern island of Hokkaido were already familiar with a native, wild plant there called hodoimo (Apios fortunei) that was occasionally eaten as an emergency food. It is believed that sometime during the Meiji period (1868-1912) American groundnut was accidentally or deliberately brought to Japan. One theory is that American groundnut was accidentally brought to Japan as a stowaway weed among apple seedlings imported from North America. Another theory is that American groundnut may have been deliberately brought to Japan in the middle of the Meiji period as an ornamental flower. It is now considered a culinary specialty of the Aomori prefecture where American groundnut agriculture is centered and where it has been eaten for more than 100 years. Although American groundnut agriculture is primarily identified with agriculture in the Aomori prefecture, it is grown in the nearby prefectures of Akita and Miyagi as well. In addition, it is known to be grown in the Southern part of Honshu in the Tottori prefecture, and radioactive testing records following the Fukushima nuclear disaster record cesium testing of American groundnut agricultural products in the central prefecture of Tochigi. An important part of the spread and popularization of American groundnut consumption in Japan has been the efforts of Dr. Kiyochika Hoshikawa to promote the cultivation of this crop in Japan and the flurry of scientific articles on the health benefits of eating American groundnut tubers. Japanese websites that sell American groundnut continue to emphasize its health benefits in their marketing efforts. There are reports of American groundnut cultivation in South Korea as well where it is grown for its nutritional benefits
Native American Usage of American groundnut
The tubers were a staple food among most Native American groups within the natural range of the plant. In 1749, the travelling Swedish botanist Peter Kalm writes, “Hopniss or Hapniss was the Indian name of a wild plant, which they ate at that time... The roots resemble potatoes, and were boiled by the Indians who ate them instead of bread.” Strachey in 1612 recorded observations of the Native Americans found in Virginia: “In June, July, and August they feed upon roots of tockohow, berries, groundnutts, fish, and greene wheate...” In Eastern Canada, the Jesuit missionary, Le Jeune, observed that the Native Americans there would, “eat, besides, roots, such as the bulbs of the red lily; ... another that our French people call ‘Rosary’ because it is distinguished by tubers in the form of beads.” The early author Rafinesque observed that the Creeks were cultivating the plant for both its tubers and seeds. The author Brinton wrote in 1885 in regards to the Lenape people, “Of wild fruits and plants they consumed the esculent and nutritious tubers on the roots of the Wild Bean, Apios tuberosa... which the Indians called hobbenis...” In 1910, Parker writes that the Iroquois were consumer significant quantities of groundnuts up until about 30 years before his writing. The Paris Documents of 1666 record that the sixth tribe of the second division of the Iroquois were identified as, “that of the Potatoe, which they call Schoneschironon” and an illustration of tubers is found in the Paris Documents with the explanation, “This is the manner they paint the tribe of the Potatoe.” The author Gilmore records the use of groundnuts by the Caddoan and Siouan tribes of the Missouri river region, and the authors Prescott and Palmer record its use among the Sioux. The Native Americans would prepare the tubers in many different ways. Many tribes peeled them and dried them in the sun, such as the Menomini who built scaffolds of cedar bark covered with mats to dry their tubers for winter use. The Menomini would sometimes dry the tubers in maple syrup or make a preserve of Groundnut tubers by boiling them in maple syrup. The Potawatomi traditionally boiled their tubers. The Meskwaki and Chippewa would peel, parboil, slice, and dry the tubers, and the Chippewa were fond of using the tubers as a sort of seasoning in all their foods.
European Usage of American Groundnut
The Europeans learned to use the American groundnut from the Native Americans. As a result, the American groundnut became interwoven with the history of the American colonies and Europe. The early traveler John Brereton was sustained by the, “good meat” and “medicinable” qualities of American groundnut during his travels in New England in 1602. In 1613, the followers of Beincourt at Port Royal ate the tubers to help them live in the New World. The American groundnut was an important factor in the survival of the Pilgrims during the first few winters of their settlement. In 1623, the Pilgrims, “having but a small quantity of corn left,” were “enforced to live on groundnuts... and such other things that the country afforded... and were easily gotten...”. The Pilgrims were taught to find and prepare American groundnut by the Wampanoag people. It seems quite probable that groundnut would have been eaten at the harvest festival of November 1621 that is regarded as the first Thanksgiving, although only venison was specifically named as a food item at this meal by a Pilgrim eyewitness account. It is believed that American groundnut may have made it back to Europe as early as 1597 and it was listed as a European garden crop in 1885. It was evaluated as a possible alternative potato crop in Ireland in 1845 during the potato famine. These early introductions to Europe appear to have resulted in little or no assimilation of the new food into the European diet. A primary reason for this lack of assimilation was that the two year cycle for an acceptable tuber yield did not match the cropping systems that were familiar to Europeans.
American groundnut is generally considered to be an undomesticated crop. Interestingly, Gretchen Beardsley in her 1939 description of the Native American utilization of American groundnut states that several historical sources describe the “cultivation” of American groundnut by Native Americans, although she dismisses the ambiguous term “cultivation” as perhaps the transplantation of tubers near a settlement, and she quotes the historical author Waugh on this subject of cultivation: “sometimes planted in suitable locations, though they are not, strictly speaking, cultivated.” It appears that all subsequent authors on American groundnut have followed Gretchen Beardsley’s interpretation of “cultivation” when referring to the early utilization of American groundnut by Native Americans. In 1985, Dr. William J. Blackmon, Dr. Berthal D. Reynolds, and their colleagues at Louisiana State University in Baton Rouge LA began a program of deliberate domestication of American groundnut with the primary goal of developing an American groundnut that can produce a significant yield in a single season. Early trials identified LA85-034 as a promising cultivar with, “elongate tubers of uniform, medium size with light brown skin and little extra rhizomatous material”. By 1988, they had collected wild seeds and tubers from 210 plants found in 19 states, although the bulk of their selections came from the state of Louisiana. From these wild materials, and a small number of single crosses, they rigorously selected for plants that met their primary breeding goals of (1) larger tuber size, (2) denser tuber set, (3) single season production, and (4) productivity in untrellised cultivation. The American groundnut domestication program at Louisiana State University continued in various forms until the mid-1990s. Cultivars from this program can still occasionally be found available from small seed companies. The largest germplasm collection of Apios americana cultivars today is found at Iowa State University under the direction of Dr. Steven Cannon. It is maintained there for scholarly and academic use. Research continues on the domestication of American groundnut at Iowa State University. Despite these efforts at domestication, the American groundnut remains largely uncultivated and underutilized in North America and Europe.
American groundnut fixes its own nitrogen, which could be a great advantage in comparison to other roots crops, such as potatoes, true yams, and sweet potatoes, that do not fix their own nitrogen and require large nitrogen fertilizer inputs. American groundnut can be nodulated by bacterial strains that are normally found in symbiosis with soybeans or cowpeas. Research has been done on the potential of the soybean strain B. japonicum to nodulate American groundnut. It was found that plants nodulated with B. japonicum yielded ~30% better than unnodulated plants if no nitrogen fertilizer was used. It was also determined that nodulated plants partitioned more carbon into non-edible shoots when they were given nitrogen fertilizer whereas unnodulated plants responded to nitrogen fertilizer with greater tuber yields than nodulated plants.
American groundnut is normally 2n=2x=22, diploid, but both diploid and triploid forms exist. Only diploids are capable of producing seeds; triploids will produce flowers but not seeds. Thus, triploids are entirely dependent on tuber division for propagation whereas diploids can be propagated through both seeds and tubers. Other than seed production, there are no easily identifiable differences between diploids and triploids. Triploids are generally found in the Northern part of American groundnut’s range whereas diploids predominate in the Southern part of the range. Triploids have been identified in the provinces or states of New Brunswick, Quebec, Ontario, Connecticut, Vermont, Massachusetts, New York, Pennsylvania, Ohio, New Hampshire, Rhode Island, Wisconsin, and Iowa. A few diploids have been found in the Northeastern part of the range, such as along the Black River in Ontario. All samples tested in the Southeastern United States have been found to be diploid.
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