Dicerandra christmanii

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Dicerandra christmanii
Endangered Garretts mint flower (5794258452).jpg
Status TNC G1.svg
Critically Imperiled  (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Lamiaceae
Genus: Dicerandra
Species:
D. christmanii
Binomial name
Dicerandra christmanii

Dicerandra christmanii is a rare species of flowering plant in the mint family known by the common names Garrett's mint, yellow scrub balm, and Lake Wales balm. It is endemic to Highlands County, Florida, in the United States, where it is known from only four sites on the Lake Wales Ridge. [4] All are contained within a tract of land measuring 6 kilometers by 3 kilometers. The plant is steadily declining due to the destruction and degradation of its habitat, and only one of the four occurrences is on protected land. It is a federally listed endangered species.

The plant was first collected in 1948 by Ray Garrett. Over the years it was included within the description of its close relative, Dicerandra frutescens . In 1989 it was reexamined and named as a new species on the basis of the color of its anthers, its scent and certain related chemical compounds in the herbage, and the length of its leaves. [4] [5] D. christmanii has white or cream-colored flowers with yellow anthers, a menthol scent, and shorter leaves, while D. frutescens has cream flowers that fade to white, and purple or white anthers. [6] The two are otherwise quite similar in appearance. D. christmanii is an aromatic shrub growing up to 1.3 feet tall. The squared, ridged stem and oppositely arranged leaves have many oil glands. Blooming occurs in summer and fall. Flowers occur singly or in whorls of three. Each is white to cream in color with purple spotting on the lobed lips. The yellow-anthered stamens protrude from the mouth of the corolla and bear white pollen. [6] The anthers have spurs that trigger the release of pollen, a trait common to genus Dicerandra. The plant is pollinated most often by Exprosopa fasciata , a species of bee-fly. [4]

This plant is one of many that is found only on Lake Wales Ridge, an area of very high endemism. The habitat is yellow-sand Florida scrub dominated by sand pines (Pinus clausa), several species of oak, and scrub hickory (Carya floridana). It does not occur together with D. frutescens, but slightly to the north of its relative. The habitat is highly fragmented, with land in the area converted to citrus groves. Remaining parts are degraded, the wildfire-adapted habitat having been overgrown with dense vegetation in an era of fire suppression. The mint only grows in open areas in the canopy, space which is rare today as the larger and woody vegetation succeeds. Fire is also required to clear out leaf litter in the understory. Furthermore, plants of this species in open habitat are more likely to be visited by pollinators than plants under overgrown canopy. [4]

Besides outright habitat loss and lack of a natural fire regime, threats to the species include drought and the invasive weed cogon grass (Imperata cylindrica). The plant has a limited ability to disperse its seeds, and this is reduced more by the fragmentation of the habitat. [4] Off-road vehicles and trash dumping may affect the area. [6]

Because D. frutescens was already on the endangered species list, D. christmanii was given that status when it was separated and named a new species. [3] It is considered "one of the most critically endangered plant species on the Lake Wales Ridge," among many endangered species. [7]

Related Research Articles

<span class="mw-page-title-main">Buzz pollination</span>

Buzz pollination or sonication is a technique used by some bees, such as solitary bees, to release pollen which is more or less firmly held by the anthers. The anthers of buzz-pollinated plant species are typically tubular, with an opening at only one end, and the pollen inside is smooth-grained and firmly attached. With self-fertile plants such as tomatoes, wind may be sufficient to shake loose the pollen through pores in the anther and accomplish pollination. Visits by bees may also shake loose some pollen, but more efficient pollination of those plants is accomplished by a few insect species who specialize in sonication or buzz pollination.

<span class="mw-page-title-main">Lake Wales Ridge National Wildlife Refuge</span> United States National Wildlife Refuge in Florida

The Lake Wales Ridge National Wildlife Refuge is part of the United States National Wildlife Refuge (NWR) System, located in four separated areas on the Lake Wales Ridge east of US 27 between Davenport and Sebring Florida. The 1,194 acre (4.8 km2) refuge was established in 1990, to protect a host of plants and animals. It is also the first to be designated primarily for the preservation of endangered plants, and is not open to the general public. It contains a high proportion of remaining Florida scrub habitat. It is administered as part of the Merritt Island National Wildlife Refuge.

<i>Warea carteri</i> Species of flowering plant

Warea carteri is a species of plant in the mustard family, Brassicaceae, known by the common names Carter's pinelandcress and Carter's mustard. It is an endangered, fire-dependent annual herb occurring in xeric, shrub-dominated habitats on the Lake Wales Ridge of central Florida in the United States.

<i>Chionanthus pygmaeus</i> Species of flowering plant

Chionanthus pygmaeus is a rare species of flowering plant in the olive family known by the common name pygmy fringetree. It is endemic to Florida, where there are 46 known occurrences as of 2010. The plant is found in increasingly rare habitat in Central Florida that is being consumed for development, and some protected areas are not managed adequately. Most populations are small. It is a federally listed endangered species of the United States.

<i>Clitoria fragrans</i> Species of legume

Clitoria fragrans is a rare species of flowering plant in the legume family known by the common name pigeon wings, or sweet-scented pigeon wings. It is endemic to Central Florida, where it was known most recently from 62 occurrences, but no current estimates of the total global population are available. The plant is a federally listed threatened species of the United States.

<i>Conradina brevifolia</i> Species of flowering plant

Conradina brevifolia is a rare species of shrub in the mint family known by the common name short-leaved false rosemary. It is endemic to Central Florida, where it is known only from the Lake Wales Ridge. There are perhaps 36 occurrences of the plant remaining, and 10 of these are likely to be destroyed as their habitat is fragmented in the coming years. About 15% of the Lake Wales Ridge, the only home territory of the plant, remains today, the rest having been cleared for development and citrus groves. Few of the extant populations have more than 25 plants. This is a federally listed endangered species of the United States.

Dicerandra cornutissima is a rare species of flowering plant in the mint family known by the common names longspurred mint, longspurred balm, and Robin's mint. It is endemic to Florida in the United States. It is found in Marion County, and possibly Sumter County, but it may have been totally extirpated from the latter. There are 12 known occurrences remaining as of 2017, down from 15 in 2000. The plant was federally listed as an endangered species in 1985.

<i>Dicerandra frutescens</i> Species of plant

Dicerandra frutescens is a rare species of flowering plant in the mint family known by the common names scrub mint and scrub balm. It is endemic to Highlands County, Florida, where it is known only from the Lake Wales Ridge. Its habitat is quickly being lost as it is converted to residential and agricultural use. It was federally listed as an endangered species of the United States in 1985.

<i>Dicerandra immaculata</i> Species of flowering plant

Dicerandra immaculata is a rare species of flowering plant in the mint family known by the common names Lakela's mint, Olga's mint, and spotless balm. It is endemic to Florida in the United States, where it is known only from Indian River and St. Lucie counties. There are seven occurrences of the plant, two of which are scheduled for destruction as the land is cleared for development. The plant was federally listed as an endangered species in 1985.

<i>Dicerandra</i> Genus of flowering plants

Dicerandra is a genus of flowering plants in the mint family. Dicerandra comprises 11 species: six perennial and five annual species. The perennials have narrow ranges in Central Florida with small population sizes and only occur on ancient dune ridges along the Lake Wales Ridge or the Atlantic Coastal Ridge; the annual species occur more broadly on sandhill habitats to the north. The perennials’ habitat has been severely fragmented due to human development over the past century. As a result, all perennial species except one are listed as federally endangered. Annual species of the clade have large ranges when compared to perennial members, with distributions of annuals ranging for hundreds of miles from the Panhandle of Florida to southeastern Georgia, with the exception of Dicerandra radfordiana which is endemic to two sites along the Altamaha river. The genus is characterized by hornlike spurs on their anthers.

<i>Echinocereus chisoensis</i> Species of cactus

Echinocereus chisoensis is a rare North American species of cactus known by the common name Chisos Mountain hedgehog cactus, native to the Chihuahuan Desert of northern Mexico and the south-central United States.

<i>Eryngium cuneifolium</i> Species of flowering plant in the celery family Apiaceae

Eryngium cuneifolium is a rare species of flowering plant in the carrot family known by the common names wedgeleaf eryngo, wedge-leaved button-snakeroot, and simply snakeroot. It is endemic to the state of Florida in the United States where it is known only from Highlands County. It is one of many rare species that can be found only on the Lake Wales Ridge, an area of high endemism. It was federally listed as an endangered species of the United States in 1987.

<i>Hypericum cumulicola</i> Species of flowering plant in the St Johns wort family Hypericaceae

Hypericum cumulicola is a rare species of flowering plant in the family Hypericaceae known by the common name highlands scrub hypericum, or highlands scrub St. John's wort. It is endemic to Florida, where it is threatened by habitat loss and degradation. It is a federally listed endangered species of the United States.

<i>Lupinus aridorum</i> Species of legume

Lupinus aridorum is a rare species of lupine known by the common name scrub lupine. It is endemic to Florida in the United States, where there were 10 known populations remaining in 2003. Fewer than 6000 individual plants were counted. It is threatened by the loss and degradation of its habitat. The scrub lupine is a federally listed endangered species of the United States.

<i>Prunus geniculata</i> Species of tree

Prunus geniculata is a rare species of plum known by the common name scrub plum. The species is endemic to Florida.

The Florida peninsula inland scrub is a shrubland community found on the Florida peninsula. The largest remaining blocks of inland scrub are in and around the Ocala National Forest and in the Lake Wales Ridge National Wildlife Refuge. The Archbold Biological Station near Lake Placid contains about 20 km2 (7.7 sq mi) of scrub habitat and sponsors biological research on it. The scrub occurs on a series of north-south running ridges composed of sand derived from ancient dune fields. The soil, a type of entisol, is derived from quartz and is low in organic matter, silt, and clay. Because the low-nutrient sandy soils do not retain moisture, the ecosystem is effectively an arid one.

Dicerandra modesta is a species of Dicerandra endemic to the Lake Wales Ridge in Central Florida. It is commonly known as blushing scrub balm. It is a listed state and federal endangered species. It is known only from a few populations in Polk County, Florida. It grows in scrub and sand hills.

<i>Osmia calaminthae</i> Rare species of bee

Osmia calaminthae, commonly known as the blue calamintha bee, is a rare species of mason bee known only from two small areas in Florida, United States. It is considered Critically Imperiled by NatureServe. The common name for the bee is derived from its distinctly blue color and its favored host plant, Calamintha ashei.

<i>Acanthomintha ilicifolia</i> Species of flowering plant

Acanthomintha ilicifolia, known by the common name San Diego thornmint, is a rare species of flowering plant in the mint family. It is native to Baja California and San Diego County, California, where it is a resident of the chaparral and coastal sage scrub plant communities and vernal pools.

References

  1. NatureServe (5 April 2024). "Dicerandra christmanii". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 16 April 2024.
  2. "Garrett's mint (Dicerandra christmanii)". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 16 April 2024.
  3. 1 2 Martin, David; U.S. Fish and Wildlife Service (21 September 1989). "Endangered and Threatened Wildlife and Plants; Dicerandra christmanii (Garrett's Mint) Determined To Be Endangered". Federal Register. 54 (182): 38946–38947. 54 FR 38946
  4. 1 2 3 4 5 USFWS. Dicerandra christmanii Five-year Review. September 2009.
  5. Huck, R. B., et al. (1989). A new Dicerandra (Labiatae) from the Lake Wales Ridge of Florida, with a cladistic analysis and discussion of endemism. Systematic Botany 14:2 197-213.
  6. 1 2 3 Dicerandra christmanii. Center for Plant Conservation.
  7. Haller, S. J. and E. S. Menges. Demographic results emphasize need for habitat manipulation and augmentation in a rare scrub plant (abstract). 95th ESA Annual Meeting, Pittsburgh, August 2010.