AFRICAN

ORCHIDS

Key to the Eulophia in section Lissolophia
Description:
Pseudobulbs (tubers) 3-6, hypogenous, in a horizontal, linear series, fleshy, flat, more or less rhomboid, bare and smooth, with narrow scarious bracts, racemes originating from underneath the most recent bulb, generally producing 2 buds simultaneously, 1 being the emerging flower spike and the other being the new growth bud; leaves green, narrow, membranous, graminiform or nearly so, caducous, not articulate, detached basally from their sheaths. Developing the new buds underneath the bulbs; racemes simple.

1a Flowers relatively small (divisions 10 mm. long at most); lower portion of the loose raceme sheathed, column less than 4 mm. long   
2a Petals widely oval or suborbicular, larger than the sepals, very obtuse apically, 5-7 veined, veins .densely branched, reddish in color
and very widely  obcuneiform, provided with yellow calluses and a short row of warts basally; anther provided behind with 3 appendages,
the median of which is much larger and reddish, than the white laterals 
Eulophia reticulata 
1b Flowers large (sepals to more than 10 mm. long); column at least 5mm. long   
3a Lateral sepals adnate basally to the labellum; inferior edges of the lateral lobes of the labellum not longer than the column; anther with
a large posterior appendage, enlarged and nearly bilobed apically; racemes of 20-25 flowers, longer than the peduncle; median lobe of
the labellum smaller than the laterals or equal to them 
Eulophia grandidieri 
4a Lateral sepals free; inferior margins of the lateral lobes of the labellum as long as the column; anther with a projecting, posterior
appendage; rachis few flowered (7-10), shorter than the peduncle; median lobe of the labellum 2-3 times longer than the laterals 
Eulophia livingstoneana 
5a Labellum not obviously 3 lobed, inferior margins often enlarged and upright, apical margins sinate-crisped; plants large, 50 cm.-1 m.
tall; raceme loose, with the flowers nearly to the base; leaves more or less wide, with their widest point clearly medially and with both
ends clearly attenuate; petals white, with all the remaining parts green, yellowish or reddish; bracts equal to or longer than the pedicel 
Eulophia plantaginea 
6a Racemes dense, widely elliptical, not more than twice as long as wide; flowers yellow, more than 16 mm. long; bracts equal to or
slightly longer than the pedicel 
Eulophia rutenbergiana 
7a Leaves very plicate, more than 10mm. wide; flowers reflective, very close to the rachis; sepals narrow and 3 veined; median lobe of
the labellum forming a small cone; flowers reddish; bracts one-third the length of the pedicel 
Eulophia nervosa 
8a Leaves not more than 3 mm. wide; flowers slightly tilting during anthesis, then upright; sepals wider, 5 veined; median lobe of the
labellum attached; labellum rose; bracts more than half the length of the pedicel or equal to it 
Eulophia hians var. nutans 

References:

World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/monocots/ accessed 26/08/2019