Agave amica

Agave amica, formerly Polianthes tuberosa, the tuberose, is a perennial plant in the family Asparagaceae, subfamily Agavoideae, extracts of which are used as a note in perfumery. Now widely grown as an ornamental plant, the species was originally native to Mexico.

Tuberose
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Asparagaceae
Subfamily: Agavoideae
Genus: Agave
Species:
A. amica
Binomial name
Agave amica
(Medik.) Thiede & Govaerts[1]
Synonyms[1]
  • Tuberosa amica Medik.
  • Polianthes tuberosa L.
  • Crinum angustifolium Houtt.
  • Polianthes gracilis Link
  • Agave tuberosa (L.) Thiede & Eggli, nom. illeg.
  • Agave polianthes Thiede & Eggli, nom. superfl.

Etymology

The common name derives from the Latin tuberosa through French tubéreuse,[2] meaning swollen or tuberous in reference to its root system.

Description

The tuberose is herbaceous, growing from underground tubers or tuberous roots. It produces offsets. The leaves are a dull green and about 1–1.5 ft (30–50 cm) long and up to 0.5 in (13 mm) wide at the base. They are slightly succulent. The inflorescence is a spike, reaching up to 3 ft (1 m) high, with pure white waxy flowers. The flowers are tubular, with a tube up to 2.5 in (6 cm) long, separating into six flaring segments (tepals) at the end, and are strongly fragrant. There are six stamens, inserted into the tube of the flower, and a three-part stigma.[3]

The double-flowered cultivar 'The Pearl' has broader and darker leaves, and shorter flower spikes, usually reaching only 1.5–2 ft (50–60 cm). Orange-flowered forms of the species have been reported.[3]

Taxonomy

The species was first described for science by Carl Linnaeus in 1753, as Polianthes tuberosa.[4] In 1790, Friedrich Kasimir Medikus moved the species to the genus Tuberosa as Tuberosa amica.[5][1] Both morphological and molecular phylogenetic studies have shown that Polianthes is embedded within the larger genus Agave, and the genus is now included in a broadly circumscribed Agave.[6][7] Two incorrect attempts were made to name the species when transferred to Agave. In 1999, Joachim Thiede and Urs Eggli published the name "Agave tuberosa". However, Philip Miller had published this name in 1768, for the species now called Furcraea tuberosa,[8] so it cannot be used again, and Thiede and Eggli's name is illegitimate. In 2001, Thiede and Eggli published a replacement name (nomen novum), "Agave polianthes". However, since Medikus's Tuberosa amica is considered to be a synonym of Polianthes tuberosa, its epithet is the second oldest and according to the International Code of Nomenclature for algae, fungi, and plants should be used when the older epithet is unavailable. Hence Thiede and Eggli's second name is superfluous,[9] and the correct name for the species within Agave is Agave amica, as was explained by Thiede and Rafaël Govaerts when they published this combination in 2017.[10]

Distribution

The tuberose is believed to be native to central and southern Mexico.[1] It is no longer found in the wild, probably as a result of being domesticated by the Aztecs. It is currently grown in many tropical and temperate countries.[3]

Uses

In perfumery

The overwhelming fragrance of the tuberose has been distilled for use in perfumery since the 17th century, when the flower was first transported to Europe. French Queen Marie Antoinette used a perfume called Sillage de la Reine, also called Parfum de Trianon, containing tuberose, orange blossom, sandalwood, jasmine, iris and cedar.[11][12] It remains a popular floral note for perfumes, either in stand-alone Tuberose fragrances or mixed floral scents, but it generally must be used in moderation because the essence is overpowering and can become sickly to the wearer.[13]

Others

In India and Bangladesh they are widely used in making flower garlands which are offered to the gods or used as wedding ornaments.

While once associated with funerals, it is now used in floral arrangements for other occasions.[14]

In Indonesia, tuberose flowers are also used in cooking.[15]

Cultivation
Flowers of the double-flowered cultivar 'The Pearl'
Tuberose seeds

Tuberoses can be grown outdoors in hardiness zones 8-10, where they will survive in-ground if the temperatures do not drop any lower than 20° Fahrenheit, -6.7° Celsius.[16] In colder zones, tuberoses are grown as summer annuals, in pots or mixed-flower borders where they can be enjoyed for their scent. To flower the plants require around 4 months of warm temperatures from the time the rhizome is planted. Gardeners usually start the rhizomes in pots in greenhouses beginning in late-winter or early spring, moving them outdoors in late spring once frost danger has passed.[17] If they are started directly in the ground at this time, they may not bloom until September, greatly reducing the period in which their blooms may be enjoyed. Once the foliage begins to yellow in October, the leaves should be clipped, the rhizomes dug and stored in a cool, dry and dark place for the winter.[17]

The most popular variety is a double-flowered cultivar known as 'The Pearl' that grows to 2.5 ft (76 cm) tall and features pale pink buds opening to cream.[18] The more common variety is called 'Mexican Single', which, although not as decorative as 'The Pearl', makes for a longer lasting cut flower.[17]

Tuberoses were especially beloved by Louis XIV of France, who had them planted in the hundreds in the flower beds of the Grand Trianon at Versailles so that the scent was overpowering. They were grown in clay pots and planted directly in the ground; to keep the perfume consistently strong new specimens were rotated in, sometimes daily.[19]

Tuberose bulbs taken out for seasonal replantation
New shoots emerging from the bulbs of tuberose
  • Buds
  • Top view of buds before blooming
  • Night view of the flower
  • Condition after about 3 weeks

References
  1. "Agave amica (Medik.) Thiede & Govaerts". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 2019-06-02.
  2. Wedgwood, Hensleigh (1855). "On False Etymologies". Transactions of the Philological Society (6): 66. Retrieved 2019-06-02.
  3. Irish, Mary & Irish, Gary (2000), "Polianthes tuberosa Linnaeus", Agaves, Yuccas and Related Plants : A Gardener's Guide, Portland; London: Timber Press, pp. 233–234, ISBN 978-0-88192-442-8
  4. "Plant Name Details for Polianthes tuberosa". The International Plant Names Index. Retrieved 2019-06-02.
  5. "Plant Name Details for Tuberosa amica Medik". The International Plant Names Index. Retrieved 2019-06-02.
  6. Bogler, David J.; Pires, J. Chris & Francisco-Ortega, Javier (2006). "Phylogeny of Agavaceae based on ndhF, rbcL, and ITS sequences: Implications of molecular data for classification". Aliso. 22 (Monocots: Comparative Biology and Evolution): 313–328. doi:10.5642/aliso.20062201.26. Retrieved 2019-06-02.
  7. Good-Avila, Sara V.; Souza, Valeria; Gaut, Brandon S. & Eguiarte, Luis E. (2006), "Timing and rate of speciation in Agave (Agavaceae)", Proceedings of the National Academy of Sciences, USA, 103 (24): 9124–9129, Bibcode:2006PNAS..103.9124G, doi:10.1073/pnas.0603312103, PMC 1482577, PMID 16757559
  8. "Plant Name Details for Agave tuberosa Mill". The International Plant Names Index. Retrieved 2019-06-02.
  9. "Agave polianthes Thiede & Eggli". World Checklist of Selected Plant Families. Royal Botanic Gardens, Kew. Retrieved 2019-06-02.
  10. Thiede, J. & Govaerts, R.H.A. (2017). "New combinations in Agave (Asparagaceae): A. amica, A. nanchititlensis, and A. quilae". Phytotaxa. 306 (3): 237–240. doi:10.11646/phytotaxa.306.3.7.
  11. Chant Wagner (2007-01-07). "M.A. Sillage de la Reine by Chateau de Versailles". MimiFroufrou.com.
  12. Saskia Wilson-Brown (2015-06-26). "Froth and Folly: Nobility and Perfumery at the Court of Versailles". blogs.getty.edu. Retrieved 2018-03-26.
  13. Marianne Mychaskiw (2017-10-13). "This Floral Note Is So Sexy, It Was Banned in the Victorian Era". InStyle Magazine. Retrieved 2018-03-26.
  14. Trujillo, E. E. (1968). Diseases of Tuberose in Hawaii (PDF) (Cooperative Extension Service Circular 427 ed.). Honolulu: University of Hawaii. p. 13. Retrieved 10 October 2015.
  15. Amit Baran Sharangi; Suchand Datta (27 February 2015). "5.3.6: Tuberose". Value Addition of Horticultural Crops: Recent Trends and Future Directions. Springer. p. 96. ISBN 978-81-322-2262-0. Retrieved 17 December 2017.
  16. Brent and Becky's Bulbs Archived 2013-06-16 at Archive.today
  17. Kathleen Norris Brenzel (2007). Sunset Western Garden Book. p. 555.
  18. "The Pearl Tuberose". Burpee Seeds. Retrieved 2018-01-30.
  19. Tony Spawforth (2008). Versailles: A Biography of a Palace. p. 15.
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