Biology:Eucomis bicolor
| Eucomis bicolor | |
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Scientific classification 
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Asparagaceae |
| Subfamily: | Scilloideae |
| Genus: | Eucomis |
| Species: | E. bicolor
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| Binomial name | |
| Eucomis bicolor Baker[1]
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Eucomis bicolor, the variegated pineapple lily or just pineapple lily,[2] is a bulbous species of flowering plant in the family Asparagaceae, subfamily Scilloideae, native to Southern Africa (the Cape Provinces, Lesotho, KwaZulu-Natal, the Free State, and the Northern Provinces).[1] The pale green, purple-margined flowers are arranged in a spike (raceme), topped by a "head" of green leaflike bracts. It is cultivated as an ornamental bulbous plant, although its flowers have an unpleasant smell, attractive to the main pollinators, flies.
Description
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Eucomis bicolor is a perennial growing from a large bulb. It reaches 30–60 cm (12–24 in) in height, with a basal rosette of wavy leaves 30–50 cm (12–20 in) long. In late summer (August in the UK), it produces a stout stem (peduncule), often with purple markings. The inflorescence is a raceme of pale green, purple margined flowers with tepals up to 15 mm (1⁄2 in) long, borne on pedicels 2 cm (3⁄4 in) long. The inflorescence is terminated by a head (coma) of pale green leafy bracts, sometimes tinged with purple. At close quarters the flowers have a strongly unpleasant smell. The ovary is green.[3][4][5]
The homoisoflavanones eucomin, eucomol,[6] (E)-7-O-methyl-eucomin, (—)-7-O-methyleucomol, (+)-3,9-dihydro-eucomin and 7-O-methyl-3,9-dihydro-eucomin[7] can be isolated from bulbs of E. bicolor.
Taxonomy
Eucomis bicolor was first described by John Gilbert Baker in 1878.[1] The specific epithet bicolor means "two-coloured";[8] the tepals are pale green with purple margins.[3] It is one of a group of larger tetraploid species of Eucomis, with 2n = 4x = 60.[9]
Distribution and habitat
Eucomis bicolor is native to Southern Africa (the Cape Provinces, Lesotho, KwaZulu-Natal, the Free State, and the Northern Provinces).[1] Along the Drakensberg escarpment it is found in damp grassland, often near streams, up to elevations of 2,500 m (8,200 ft).[3]
Ecology
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Eucomis bicolor is primarily pollinated by flies, including blowflies, house flies and flesh flies, attracted by the sulphur compounds in the scent of the flowers.[10]
Cultivation
In cultivation, Eucomis bicolor is not fully frost-hardy. In the US, it is classed as hardy in USDA zones 8–10, and requires a winter mulch in colder areas (zones 6–7).[2] In the UK, it is said to be hardy down to −10 °C (14 °F), if kept dry in winter. Sun exposure and plentiful water are required in summer for successful flowering.[3] It has gained the Royal Horticultural Society's Award of Garden Merit.[11]
The cultivar E. bicolor 'Alba' has plain white flowers and lacks any purple coloration. It resembles Eucomis autumnalis but can be distinguished by the long flower stalks (pedicels).[3]
References
- ↑ 1.0 1.1 1.2 1.3 "Eucomis bicolor". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. http://apps.kew.org/wcsp/namedetail.do?name_id=305888.
- ↑ 2.0 2.1 "Pineapple lily – Eucomis bicolor". http://www.finegardening.com/plantguide/eucomis-bicolor-pineapple-lily.aspx.
- ↑ 3.0 3.1 3.2 3.3 3.4 Compton, James (1990). "Eucomis L'Heritier". The Plantsman 12 (3): 129–139.
- ↑ "August 2011 Plant Profile: Eucomis bicolor". University of Washington Botanic Gardens. http://depts.washington.edu/uwbg/news/2011/08/02/july-2011-plant-profile-eucomis-bicolor/.
- ↑ RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. pp. 1136. ISBN 978-1405332965.
- ↑ Heller, W.; Tamm, Ch. (1981), "Homoisoflavanones and Biogenetically Related Compounds", Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products, Volume 40, pp. 105–152, doi:10.1007/978-3-7091-8611-4_3
- ↑ Heller, W.; Andermatt, P.; Schaad, W.A.; Tamm, C. (1976). "Homoisoflavonones. IV. New constituents of the eucomin series of Eucomis bicolor". Helvetica Chimica Acta 59 (6): 2048–2058. doi:10.1002/hlca.19760590618. PMID 1017955.
- ↑ Harrison, Lorraine (2012). RHS Latin for gardeners. United Kingdom: Mitchell Beazley. p. 224. ISBN 9781845337315.
- ↑ Zonneveld, B.J.M.; Duncan, G.D. (2010). "Genome sizes of Eucomis L'Hér. (Hyacinthaceae) and a description of the new species Eucomis grimshawii G.D.Duncan & Zonneveld". Plant Systematics and Evolution 284 (1–2): 99–109. doi:10.1007/s00606-009-0236-y.
- ↑ "Eucomis bicolor Baker". Plants of the World Online. Royal Botanic Gardens, Kew. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:534989-1.
- ↑ "Eucomis bicolor AGM". Royal Horticultural Society. https://www.rhs.org.uk/Plants/6919/Eucomis-bicolor/Details.
External links
- Dibakwane, Dineo (July 2015). "Eucomis bicolor". SANBI. http://pza.sanbi.org/eucomis-bicolor.
Wikidata ☰ Q4529697 entry
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