Biology:Dalea mountjoyae
| Dalea mountjoyae | |
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| Dalea mountjoyae in bloom | |
Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fabales |
| Family: | Fabaceae |
| Subfamily: | Faboideae |
| Genus: | Dalea |
| Species: | D. mountjoyae
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| Binomial name | |
| Dalea mountjoyae M.Woods
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| Synonyms[1][2][3] | |
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Dalea mountjoyae, commonly known as sprawling white-tassels, is a species of flowering plant in the family Fabaceae. It is endemic to the southeastern United States, where it occurs primarily in wet pine savannas of the Atlantic and Gulf Coastal Plain.[1]
Description
Dalea mountjoyae is a perennial herb characterized by a sprawling growth habit. The leaves are pinnately compound with narrow leaflets, typical of the genus. The inflorescences are elongated and cylindrical, bearing numerous small white flowers arranged in dense spikes, giving rise to the common name “white-tassels.” The flowers are papilionaceous and adapted for insect pollination.
Taxonomy
The species was described by M. Woods in 2013 in Phytoneuron (issue 2013–23, page 1).[3] It represents a segregate from the Dalea carnea complex and has a complex nomenclatural history. The taxon was previously treated as Dalea carnea var. gracilis and earlier as Petalostemon gracilis Nutt. (1834), which serves as the basionym.[1][3]
The epithet gracilis could not be used at species rank within Dalea because it was preoccupied, necessitating the replacement name Dalea mountjoyae.[1] The species is placed in Dalea subgenus Dalea, section Kuhnistera.[1]
Etymology
The specific epithet mountjoyae honors Marcella F. Mountjoy.[3]
Distribution and habitat
Dalea mountjoyae is endemic to the southeastern United States, occurring from southern and southwestern Georgia westward to southeastern Louisiana, with additional records from Alabama, Florida, and Mississippi.[1][4] It inhabits wet pine savannas, a fire-maintained ecosystem characterized by open pine canopies, high herbaceous diversity, and seasonally saturated soils.[1] Occurrence data compiled by the Global Biodiversity Information Facility (GBIF) document hundreds of records across its range, including herbarium specimens and research-grade observations.[2]
Phenology
Flowering occurs from August to September.[1]
Ecology
Dalea mountjoyae is associated with wetland environments and is classified as a facultative (FAC) wetland species in the Atlantic and Gulf Coastal Plain, indicating that it is usually found in wetlands but may also occur in non-wetland habitats.[1] Like many species of pine savannas, it is adapted to periodic fire, which maintains the open habitat structure required for its persistence.
Conservation
Dalea mountjoyae has often been treated under the name Dalea carnea var. gracilis, for which NatureServe assigns a global rank of G5T3, indicating a vulnerable taxon at the variety level.[4] The taxon is endemic to the southeastern United States and is estimated to occur at approximately 21 to 80 sites, many of which are historical.[4] In parts of its range, particularly in Georgia, populations may be extirpated, while in other areas they persist but are incompletely documented.[4]
Population sizes vary widely, ranging from small groups of fewer than 50 individuals to sites with hundreds or more stems. Overall abundance and long-term trends remain poorly understood.[4] The primary threat to the species is habitat degradation resulting from fire suppression, which alters the structure of wet pine savannas and reduces habitat suitability.[4] Additional threats include habitat loss and hydrological alteration. Conservation efforts focus on maintaining appropriate fire regimes, monitoring known populations, and surveying suitable habitats for additional occurrences.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "Dalea mountjoyae". Flora of the Southeastern United States. https://fsus.ncbg.unc.edu/main.php?pg=show-taxon-detail.php&taxonid=2776.
- ↑ 2.0 2.1 "Dalea mountjoyae". GBIF. https://www.gbif.org/species/10804588.
- ↑ 3.0 3.1 3.2 3.3 "Dalea mountjoyae M.Woods". International Plant Names Index. https://www.ipni.org/n/77129508-1.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 "Dalea carnea var. gracilis". NatureServe Explorer. https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.138844/Dalea_carnea_var_gracilis.
Wikidata ☰ Q91578981 entry
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