Biology:Dracaena eilensis
| Dracaena eilensis | |
|---|---|
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Asparagaceae |
| Subfamily: | Nolinoideae |
| Genus: | Dracaena |
| Species: | D. eilensis
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| Binomial name | |
| Dracaena eilensis Chahin. Byng & Christenh.[1]
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| Synonyms[1] | |
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Dracaena eilensis, synonym Sansevieria eilensis,[1] is a xerophytic CAM succulent[2] native to a small region of Somalia near the town of Eyl. The species was collected in 1973 by John Lavranos.[3]
Description
Dracaena eilensis is a slow growing plant with rough, cylindrical, downward curving leaves which arise from an underground rhizome. A mature plant typically has 2 to 3 leaves, which are succulent and between 7–12 cm long and 1.9-2.5 cm thick.
The leaves are typically a light bluish-green colour with regular bands of white. The leaves are also marked by several green longitudinal lines, marking areas where the leaf will fold in on itself during drought, or swell after watering.
The leaves change morphology dramatically as the plant grows. Young plants have a deep channel, which runs the full length of each leaf, and has reddish-brown margins edged with a papery brown cuticle. As the plant matures, the edges of newer leaves roll together to form a smooth cylindrical leaf with a dried papery cuticle at the tip and base of each leaf.[4]
Dracaena eilensis flowers are borne on a spike-like raceme approximately 30 cm long.
Distribution and habitat
Dracaena eilensis is found only in a small region near Eyl. This region receives less than 100 mm rainfall annually,[5] which is unusually dry even among xerophytic sansevierias.[6] The air temperature in this region ranges between 22-35 °C while the soil temperature is typically 24-27 °C.[6]
Cultivation
Dracaena eilensis is rarely found in cultivation. The plant is extremely slow growing, and requires warm temperatures and bright light to grow, making commercial cultivation unviable. Limited cultivation of D. eilensis using micropropagation has been successfully employed by collectors and enthusiasts, but as of writing, D. eilensis is not available from any commercial sources.[7]
D. eilensis, like most xerophytic Dracaena, grows best in porous, well drained soil. Excessive watering will cause the fleshy roots to rot, so it is essential that the soil is allowed to dry sufficiently between waterings.[4][8] Many growers prefer a coarse potting mix consisting of a combination of inorganic and organic ingredients. Gravel, perlite, vermiculite, and decomposed granite are commonly used to add weight and improve drainage, while bark chips and coconut coir or husks are used for moisture retention. Such a porous mix will prevent over watering and provide ample aeration, but requires more frequent watering to prevent over drying.
References
- ↑ 1.0 1.1 1.2 "Dracaena bagamoyensis (N.E.Br.) Byng & Christenh.". Plants of the World Online. Royal Botanic Gardens, Kew. http://www.plantsoftheworldonline.org/taxon/urn:lsid:ipni.org:names:77183184-1. Retrieved 2020-02-20.
- ↑ Nelson, Elizabeth A.; Sage, Tammy L.; Sage, Rowan F. (2005). "Functional leaf anatomy of plants with crassulacean acid metabolism". Functional Plant Biology 32 (5): 409. doi:10.1071/FP04195.
- ↑ "Holotype of Sansevieria eilensis Chahinian [family LILIACEAE [family DRACAENACEAE]"]. JSTOR. http://plants.jstor.org/specimen/mo-104969?s=t. Retrieved 2013-03-26.
- ↑ 4.0 4.1 Chahinian, B. Juan (2005). The Splendid Sansevieria: An Account of the Species. ISBN 987-43-9250-9.
- ↑ "Greater Horn of Africa Climate Outlook Forum considers September–December rainfall". WMO. 6 September 2011. https://www.wmo.int/pages/mediacentre/press_releases/pr_926_en.html. Retrieved 2013-05-06.
- ↑ 6.0 6.1 Lavranos, John J. (1994). "THE DISCOVERY OF SANESVIERIA SP. 'EYL'.". The Sansevieria Journal 3: 51.
- ↑ "The Sansevieria Journal". SANS. http://www.hort.net/lists/inactive/sansevierias/aug98/msg00002.html. Retrieved 2013-05-06.
- ↑ Stover, Hermine (1983). The Sansevieria Book.
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