Lobelia deckenii

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Lobelia deckenii
Lobelia gregoriana.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Campanulaceae
Genus: Lobelia
Species:
L. deckenii
Binomial name
Lobelia deckenii
Synonyms [1]

Dortmanna deckenii(Asch.) Kuntze
Tupa deckeniiAsch.
Tupa kersteniiVatke

Contents

Lobelia deckenii is a species of flowering plant in the family Campanulaceae. [3] It is a giant lobelia endemic to the mountains of Tanzania. [1] It is listed as a threatened plant of the forests of Cherangani hills, Kenya. [4] It grows in moist areas, such as valley bottoms and moorland, in contrast to Lobelia telekii which grows in a similar but drier habitat. These two species produce occasional hybrids. Lobelia deckenii plants usually produce multiple rosettes. Each rosette grows for several decades, produces a single large inflorescence and hundreds of thousands of seeds, then dies. Because individual plants have multiple rosettes, they survive to reproduce repeatedly, and plants with more rosettes flower more frequently. It is iteroparous. [5]

Lobelia deckenii plants usually form between one and eighteen rosettes which are connected underground. The individual rosettes grow slowly in the alpine environment, [5] and may take decades to reach reproductive size. The rosette that produces an inflorescence dies after flowering, but the remaining connected rosettes live on. [5]

Lobelia deckenii is the only alpine species of lobelia that is native to Kilimanjaro, [6] occurring between 3,800 and 4,300 m (12,500 and 14,100 ft). [7]

Lobelia deckenii subsp. keniensis is the variety of Lobelia deckenii that occurs on Mount Kenya, between 3,300 and 4,600 m (10,800 and 15,100 ft). It is eaten less by rock hyrax than Lobelia telekii , which occurs more often in hyrax habitat. The lobelia species on Mount Kenya are both pollinated by birds, [8] [9] especially the scarlet-tufted sunbird and the alpine chat. [10]

This species of giant lobelia is known for the reservoirs of water held in its rosettes, which freeze at night and protect the apical meristem which is contained in a dense central leaf bud. When this reservoir is drained, the temperature of the inner meristem drops below freezing, which does not occur when the fluid is left intact. [11] The crescent-shaped ice cubes formed in these rosettes gave rise to the nickname, "gin and tonic lobelia".

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The family Campanulaceae, of the order Asterales, contains nearly 2400 species in 84 genera of herbaceous plants, shrubs, and rarely small trees, often with milky sap. Among them are several familiar garden plants belonging to the genera Campanula (bellflower), Lobelia, and Platycodon (balloonflower). Campanula rapunculus and Codonopsis lanceolata are eaten as vegetables. Lobelia inflata, L. siphilitica and L. tupa and others have been used as medicinal plants. Campanula rapunculoides may be a troublesome weed, particularly in gardens, while Legousia spp. may occur in arable fields.

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The rock hyrax, also called dassie, doop, Cape hyrax, rock rabbit, and coney, is a medium-sized terrestrial mammal native to Africa and the Middle East. Commonly referred to in South Africa as the dassie, it is one of the five living species of the order Hyracoidea, and the only one in the genus Procavia. Rock hyraxes weigh 4–5 kg (8.8–11.0 lb) and have short ears.

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<i>Dendrosenecio keniodendron</i> Species of flowering plant

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<i>Dendrosenecio keniensis</i> Species of plant

Dendrosenecio keniensis is one of the giant groundsels endemic the higher altitudes of Mount Kenya. It is in the family Asteraceae and the genus Dendrosenecio. Dendrosenecio keniodendron occurs the upper alpine zone of Mount Kenya and D. keniensis in the wetter areas of the lower alpine or the moorlands.

<i>Lobelia telekii</i> Species of flowering plant

Lobelia telekii is a species of flowering plant in the family Campanulaceae, that is found only in the alpine zones of Mount Kenya, Mount Elgon, and the Aberdare Mountains of East Africa. It occurs at higher altitudes on well-drained sloped hillsides. It is a semelparous species, putting all its reproductive effort into producing single large inflorescence up to 3 metres (10 ft) tall, and then dying. Inflorescences of L. telekii also possesses a large pith-volume for internal water storage and marcescent foliage which could provide insulation. It secretes a polysaccharide into this reservoir, which may be useful for its survival in the cold climate. The plant is named after the Austro-Hungarian explorer, Count Sámuel Teleki.

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Dendrosenecio johnstonii, formerly Senecio johnstonii, is a species of giant groundsel found in the middle altitudes of Mount Kilimanjaro in Africa. A recent botanical reclassification split off some species formerly in Senecio, putting the giant groundsels in the new genus Dendrosenecio. It also redefined the former species Senecio cottonii, as a subspecies of Dendrosenecio johnstonii. Both genera are in the family Asteraceae. The giant grounsels of the genus Dendrosenecio evolved, about a million years ago, from a Senecio that established itself on Mount Kilimanjaro, with those that survived adapting into Dendrosenecio kilimanjari. As it moved down the mountain, the adaptations necessary for the new environment created the new species, Dendrosenecio johnstonii. Various subspecies are found on other mountains.

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References

  1. 1 2 3 "Lobelia deckenii (Asch.) Hemsl". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved September 27, 2020.
  2. International Plant Names Index
  3. "Lobelia deckenii (Asch.) Hemsl". World Flora Online. The World Flora Online Consortium. n.d. Retrieved September 27, 2020.
  4. Mbuni, Yuvenalis Morara; Zhou, Yadong; Wang, Shengwei; Ngumbau, Veronicah Mutele; Musili, Paul Mutuku; Mutie, Fredrick Munyao; Njoroge, Brian; Kirika, Paul Muigai; Mwachala, Geoffrey; Vivian, Kathambi; Rono, Peninah Cheptoo; Hu, Guangwan; Wang, Qingfeng (18 April 2019). "An annotated checklist of vascular plants of Cherangani hills, Western Kenya". PhytoKeys. 120: 1–90.
  5. 1 2 3 Young, Truman P. (1984). "The comparative demography of semelparous Lobelia telekii and iteroparous Lobelia keniensis on Mount Kenya". Journal of Ecology. 72 (2): 637–650. doi:10.2307/2260073. JSTOR   2260073.
  6. Young, T.P. 1991. La flora, fauna y ecología del Monte Kenia y el Kilimanjaro. Pp. 37-49 En: Guía para el Monte Kenia y el Kilimanjaro (Iain Allan, ed.) Mountain Club of Kenya ISBN   978-9966-9856-0-6
  7. Kilimanjaro. Oh rei da áfrica. Revista Planeta, dezembro de 2005.
  8. Young, Truman P. (1982). "Bird visitation, seed set, and germination rates in two species of Lobelia on Mount Kenya". Ecology. 68 (6): 1983–1986. doi:10.2307/1940139. JSTOR   1940139.
  9. Burd, Martin (1995). "Pollinator behavioural responses to reward size in Lobelia deckenii: no escape from pollen limitation of seed set". Journal of Ecology. 83 (5): 865–872. doi:10.2307/2261423. JSTOR   2261423.
  10. Smith, Alan P.; Truman P. Young (1987). "Tropical Alpine Plant Ecology". Annual Review of Ecology and Systematics. 18: 137–158. doi:10.1146/annurev.es.18.110187.001033.
  11. Young, Truman P.; Susan Van Orden Robe (1986). "Micro-environmental role of a secreted aqueous solution in afro-alpine Lobelia keniensis". Biotropica. 18 (3): 267–269. doi:10.2307/2388496. JSTOR   2388496.