Nyssa biflora

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Nyssa biflora
Swamp tupelo.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Cornales
Family: Nyssaceae
Genus: Nyssa
Species:
N. biflora
Binomial name
Nyssa biflora

Nyssa biflora, commonly referred to as the swamp tupelo, or swamp black-gum [2] is a species of tupelo that lives in wetland habitats. Swamp tupelo grows chiefly in the coastal plains from Delaware, eastern Maryland, and southeastern Virginia, south to southern Florida and west to eastern Texas. Its range extends north up the Mississippi Valley to southern Arkansas and west and south Tennessee. [3]

The swamp tupelo grows in humid warm climates. It not only tolerates flooding but actually thrives under those conditions. It is seldom found on sites that are not inundated much of the growing season. Swamp tupelo grows in headwater swamps, strands, ponds, river bottoms, bays, estuaries, and low coves. Normally it does not grow in the deeper parts of swamps or overflow river bottoms. [3]

The type of water regime is more important to growth of swamp tupelo than the soil type. Best growth is achieved on sites where the soil is continuously saturated with very shallow moving water. Growth can be reduced as much as 50 percent when the water is stagnant, as in ponds. Intermittent flooding, with periodic drying cycles, or continuous deep flooding even by moving water, also reduces growth. [3]

Trees and shrubs commonly associated with swamp tupelo are red maple (Acer rubrum), buttonbush (Cephalanthus occidentalis), buckwheat-tree (Cliftonia monophylla), dogwood (Cornus spp.), swamp cyrilla (Cyrilla racemiflora), swamp-privet (Forestiera acuminata), Carolina ash (Fraxinus caroliniana), loblolly-bay (Gordonia lasianthus), dahoon (Ilex cassine), inkberry (I. glabra), yaupon (I. vomitoria), fetterbush lyonia (Lyonia lucida), and bayberry (Myrica spp.). [3]

The swamp tupelo has minute greenish-white flowers that appear in the spring with the leaves, usually in late April. Insects, primarily bees, are the major pollinating vector, but pollen is also spread by wind. The fruit, a drupe, changes from green to a dark blue as it ripens, usually in early November. [3] The seeds normally overwinter and germinate the following spring. Germination does not take place under water, but submerged seeds germinate once the water subsides below the soil surface. Germination is rapid in moist, drained conditions at 21 °C (70 °F) and higher. After germination, seedlings must grow rapidly to keep the apex and leaves above water, because prolonged submergence during active growth will kill them. Submergence during the dormant season, however, has no adverse effect. [3]

Swamp tupelo normally develops a taproot and has a swollen base to the mean height of the growing season water level. Water roots, which develop under flooded conditions, help support the tree and capture nutrients. These specialized roots tolerate high carbon dioxide concentrations, oxidize the rhizosphere, and carry on anaerobic respiration. Thus, they are the key to the species ability to thrive under flooded conditions. [3]

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References

  1. IUCN SSC Global Tree Specialist Group.; Botanic Gardens Conservation International; et al. (BGCI) (2020). "Nyssa biflora". IUCN Red List of Threatened Species . 2020: e.T156812021A156821785. doi: 10.2305/IUCN.UK.2020-1.RLTS.T156812021A156821785.en . Retrieved 20 November 2021.
  2. "Nyssa biflora Walter". Global Biodiversity Information Facility (GBIF). Retrieved 2016-02-20.
  3. 1 2 3 4 5 6 7 PD-icon.svg This article incorporates public domain material from McGee, Charles E.; Outcalt, Kenneth W. (1990). "Nyssa silvatica". In Burns, Russell M.; Honkala, Barbara H. (eds.). Hardwoods. Silvics of North America. Vol. 2. Washington, D.C.: United States Forest Service (USFS), United States Department of Agriculture (USDA) via Southern Research Station.