Elaeocarpus joga is a species of tree in the family Elaeocarpaceae. It is native to the Mariana Islands and Palau. It is a moderately-sized tree with blue-coloured, round, 1.5cm diameter fruit and leaves which turn bright red before they senescence.
| Elaeocarpus joga | |
|---|---|
| |
| Mature tree in Dededo, Guam | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Oxalidales |
| Family: | Elaeocarpaceae |
| Genus: | Elaeocarpus |
| Species: | E. joga
|
| Binomial name | |
| Elaeocarpus joga | |
| Synonyms[2] | |
In the Chamorro language it is called yoga.[3]
Description
editMerrill (see taxonomy) considered it to be a distinct species by virtue of its relatively small leaves with numerous domatia upon them, and its relatively large flowers.[3]
Taxonomy
editElaeocarpus joga was first formally described by Elmer Drew Merrill in 1914,[1][3] but earlier described in the 1905 The Useful Plants of Guam by W. E. Safford. The holotype was collected by R. C. McGregor in Guam in 1911.[3]
In the 1971 article The Flora of Guam, B. C. Stone recorded it as E. sphaericus (sensu Schum., now E. angustifolius), but in a 1979 article in the same journal updating the flora of the region, A geographical checklist of the Micronesian Dicotyledonae, Fosberg et al. did not accept this and continued to recognise E. joga.[2]
Coode wrote in 2010 that E. joga, and its partial synonym E. carolinensis, need to be re-examined (it falls outside the region studied in his paper) to see if it truly is an independent species and not a synonym, and to which section of the genus Elaeocarpus it belongs. If it belongs to section Ganitrus like E. angustifolius, this is a biogeographic oddity, because all other species appear to have evolved in the Malay Archipelago.[4] Merrill places it in the section Dicera.[3] Confusingly, Fosberg et al. also state that E. grandis, which may in turn be a synonym of E. angustifolius, has been introduced to Palau.[2]
A 2013 thesis using molecular phylogenetics to study the Elaeocarpus in Australasia tested an old sample of E. carolinensis from the Caroline Islands and found it generally nested within E. angustifolius in most sequences studied, but somewhat divergent in trnL-F. It clearly belongs to section Ganitrus, which was found nicely genetically monophyletic, despite the section's circumscription being based on Cooke's morphological studies alone.[5]
Distribution
editAccording to Fosberg et al. the species is native to the Marianas Islands (Guam, Rota, Saipan, Pagan, Alamagan) and the nation of Palau (Babeldaob).[2][6]
Uses
editIn the late 19th century some logging of this species took place on Guam. It yielded logs of up to 14m, although Safford was unaware of trees that size in 1905.[3]
See also
editGallery
edit-
Mature tree canopy -
Flowers -
Flower raceme and immature fruits. Dededo, Guam -
Leaves and fruit -
Leaf and ripe fruits. Dededo, Guam -
Mature tree saved from clearing on military land. Dededo, Guam
References
edit- ^ a b "Elaeocarpus joga". International Plant Names Index. Royal Botanic Gardens, Kew, Harvard University Herbaria & Libraries and Australian National Botanic Gardens. Retrieved 14 January 2022.
- ^ a b c d Fosberg, F. R.; Sachet, M.-H.; Oliver, R. (June 1979). "A geographical checklist of the Micronesian Dicotyledonae". Micronesica, Journal of the College of Guam. 15 (1–2): 157. Retrieved 14 January 2022.
- ^ a b c d e f Merrill, Elmer Drew (1914). "An enumeration of the plants of Guam". Philippine Journal of Science. Section C, Botany. 9: 108. Retrieved 14 January 2022.
- ^ Coode, M. J. E. (2010). "Elaeocarpus for Flora Malesiana: new taxa and understanding in the Ganitrus group". Kew Bulletin. 65 (3): 355–399. Bibcode:2010KewBu..65..355C. doi:10.1007/s12225-010-9223-2. JSTOR 23216389.
- ^ Baba, Yumiko (July 2013). Evolution, systematics and taxonomy of Elaeocarpus (Elaeocarpaceae) in Australasia (PDF) (PhD thesis). James Cook University. Docket 38321. Retrieved 15 January 2022.
- ^ Raulerson, L., & A. Rinehart. Trees and Shrubs of the Mariana Islands. 1992.