Eulophia

Eulophia
Eulophia euglossa
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Epidendroideae
Tribe: Cymbidieae
Subtribe: Eulophiinae
Genus: Eulophia
R. Br.
Species

See Species

Synonyms
  • Cyrtopera Lindl.
  • Hypodematium A. Rich.
  • Lissochilus R. Br.
  • Platypus Small & Nash
  • Semiphajus Gagnep.
  • Thysanochilus Falc.

Eulophia is a genus of approximately 165 species of orchids. It was first described by John Lindley in 1821. The name "Eulophia" was derived from the Greek words "eu" (well) and "lophos" (plume), referring to the crested ridges of the labellum (lip) in most species. This genus is abbreviated Eupha in horticultural trade.

These are usually terrestrial or ground orchids, although some are epiphytes, and rarely, lithophytes. They are distributed in shady rainforests or in open scrub or woodland in the tropics and subtropics of Africa, India,[1] Asia, Queensland (Australia), and the Americas, although most are found in Africa. Many can survive the dry season through their large bulbous ‘corms’.

Some species, such as Eulophia petersii, have adapted to very arid environments and are among the few orchids to have truly evolved desert living species. In the frost-free, semi-arid areas of Southern California, many Eulophia species, such as E. macra, E. petersii, E. plantaginea, and E. speciosa, can be grown outdoors year-round in well-drained pots with cactus/succulent potting mix (although E. speciosa prefers being grown in pure white sand), as long as they are given ample light through the winter and a drier winter resting period. Warmer growers, such as E. pulchra and possibly even the extremely rare and difficult E. cucullata (the foxglove orchid), can probably be grown outdoors in the warmer areas of Florida and Hawaii, also.

The deciduous or evergreen leaves are usually pleated, with longitudinal veins. They are green and sheathed at the base. But in some species, the leaves may be reduced or have become brown scales. Some are leafless myco-heterotrophs.

The generally large, underground, fleshy rhizome indicates a sympodial growth habit, and this makes Eulophias fairly easy to divide and propagate, provided the grower is gentle.

The inflorescence arises from the base. It grows into a raceme. It is sometimes branched, as in the cases of E. macra and E. petersii. The inflorescences on the species with non-branching spikes can support as many as 50 flowers; but in species with branching inflorescences, up to 150 blooms can occur per spike. While most Eulophia flowers rarely exceed 2" in width, this is often made up for by the sheer abundance of interesting blooms they produce. The sepals and the petals are alike. The lip usually has three lobes. As for most orchids, there are two pollinia for each flower. Eulophias (in bloom) can reach a height of 1.6 m (6 ft.).

Species

Eulophia spectabilis

Transferred to Orthochilus

After a molecular phylogeny published in 2014 revealed that the genus Eulophia was paraphyletic unless a clade containing Orthochilus was recognized, 34 species and one subspecies were transferred to the resurrected genus Orthochilus, which included many Eulophia and all Pteroglossaspis taxa. This reduced the number of Eulophia species from 201 to 165. The authors also suggested recognizing Oeceoclades pulchra instead of Eulophia pulchra. The taxa formerly recognized in Eulophia include:[2]

Hybrids

References

  1. ↑ Shrivastava, R.J. 2004. Range extension of Eulophia flava (Lindl.) J. D. Hook. (Orchidaceae) in India. Selbyana 25(1): 23-26.
  2. ↑ Martos, F., S.D. Johnson, C.I. Peter, and B. Bytebier. 2014. A molecular phylogeny reveals paraphyly of the large genus Eulophia (Orchidaceae): A case for the reinstatement of Orthochilus. Taxon 63(1): 9-23.
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