Lepanthes eltoroensis

Lepanthes eltoroensis is a species of orchid known by the common name Luquillo Mountain babyboot orchid.[4] It is endemic to El Yunque National Forest in Puerto Rico, growing primarily in the Luquillo Mountains.[5] It is named for the El Toro Trail in the mountains.[6] It was a federally listed endangered species of the United States from 1991[2] to 2021, when it was delisted due to recovery.[3]

Lepanthes eltoroensis

Delisted (ESA)[1][2][3]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Epidendroideae
Genus: Lepanthes
Species:
L. eltoroensis
Binomial name
Lepanthes eltoroensis
Stimson

Habitat
El Yunque National Forest

Lepanthes eltoroensis grows at six sites of Sierra palm (Prestoea acuminata var. montana), palo colorado, and dwarf forest areas within the Luquillo Mountains.[5] Because the orchid is an epiphyte (living on other plants without parasitizing), L. eltoroensis finds its home on the trunks of several species of trees, known also to house mosses and liverworts.[5] The orchid has only been found on approximately 40-60 trees within the forest, all at an altitude of 2,789 ft or above.[5] More recent studies have noted larger populations of L. eltoroensis on the Tradewinds Trail as opposed to the El Toro Trail, for which it was named, possibly due to greater numbers of Sierra palm, offering a more closed canopy.[7]

Sierra palm tree

Physical characteristics

The plant is no more than 4 centimeters long with a single leaf and three-seven slender stems.[5] Eltoroensis stands apart from its genus of Lepanthes orchids due to its comparatively long inflorescence, obovate leaves ( 0.4-0.9 in long x 0.2-0.4 in wide) and ciliate sepals.[5] The solitary flowers with red/orange petals (two lobed petals; three lobed lip) lie against the leaf and are just a few millimeters long.[4][5][6]

Growth and life-cycle patterns

Lepanthes eltoroensis grows in a circular pattern, favoring the northwestern side of the bole of its phorophyte (host) trees.[7]

The average L. eltoroensis will live for about 5.2 years, depending on various factors.[7] Researchers have not yet found the pollinator specific to L. eltoroensis, but other lepanthes species attract black winged fungus gnats.[7]

Based on restricted gene flow, small population sizes and high genetic variance between lepanthes species, researchers believe the eltoroensis and others arose through genetic drift.[8]

Endangered status and threats

This plant was listed as an endangered species because it is threatened by forest management practices and hurricane activity. Plant collectors have sought this plant, and have destroyed at least one population of it once found in the sierra palm forest.[5][6]

Conservation

Diversity within the L. eltoroensis species is low, limiting the potential for adaptive development, and jeopardizing the success of the populations.[9] Researchers have suggested the artificial cross-pollination of the L. eltoroensis and L. caritensis (which suffers from similar genetic restrictions) in order to combat the homogeneity of genetic material.[9] Additionally, because of L. eltorensis' compatibility with multiple species for phorophytes, survival success is expected to be higher compared to other Lepanthes, and relocation more accessible/promising.[9]

References
  1. "No common name (Lepanthes eltoroensis)". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 9 October 2023.
  2. 56 FR 60933
  3. 86 FR 31972
  4. "El Yunque National Forest: L. eltoroensis". Endemic Plant Facts. 2009.
  5. Beacham, Walton (2000). "Beacham's Guide to the Endangered Species of North America". Dicots, Monocots, Glossary, Organizations, Indexes. 6: 3262–3263 – via GALE.
  6. USFWS (1996). "Cranichis ricartii and Lepanthes eltorensis Recovery Plan" (PDF). USFWS: 21.
  7. Tremblay, Raymond (2009). "Circular distribution of an epiphytic herb on trees in a subtropical rain forest". Tropical Ecology. 50: 211–217 – via Web of Science.
  8. Tremblay, Raymond (2001). "Gene flow and effective population size in Lepanthes (Orchidaceae): a case for genetic drift". Biological Journal of the Linnean Society. 72: 47–62. doi:10.1111/j.1095-8312.2001.tb01300.x.
  9. Tremblay, Raymond (2000). "Plant longevity in four species of Lepanthes (Pleurothallidinae; Orchidaceae)". Lindelyana. 15: 257–266 – via ResearchGate.
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