ONCIDIUM MACRANTHUM inar 
Pseudobulbis pyriformibus plus minus clongatis, vulgo diphyllis, foliis cuneatooblongo ligulatis acutis, pedunculo valde elongato, superne racemoso, 
inferne paniculato, axibus secundariis distantibus, bracteis amplis complicatis acutis, ovaria pedicellata longe non equantibus, sepalis oblongis obtusis 
unguiculatis, sepalo impari basi utrinque auriculato, tepalis a basi brevi unguiculata abrupte oblongis obtusiusculis undulatis, labello basi utrinque hastato, 
extrorsum triangulo, lacinia mediana triangula porrecta seepe utrinque angulata, callo ante basin bigibberosam erectogibbo, vertice tricarinato, carinis extrorsis 
basi et apice angulata exsilientibus, columnz alis dolabriformibus retusis, 
ONCIDIUM MACRANTHUM Lindl. Gen. et Spec. Orch. p. 205 ! Lindl. Fol. Orch, 1., Oncidium. p, 4., Nr. 4! Hook. Bot. Mag 5743! Gard. Chron. 1869, 
739 xyl! Williams Orch. Gr. Man. ed. 6, p. 491, xyl! Warner Sel. Orch. 1., 17! Floral Mag. 386! ; 
Sepala lateralia et tepala vulgo aurantiaca. Sepalum impar vulgo brunneum ungue viridi, Labellum disco album, violaceopurpureo marginatum, 
Ale purpureoviolaceee in columna flaveola. Exstant varietates colorum, ita Oncidium macranthum Williamsianum, quod pollet macula maxima purpureo 
violacea in tepalis, sepalis equaliter castaneis, 
Crescit in Ecuador, Pavon ! (Herb Boiss.- Barbé) W. Lobb! Warscewicz! Jamieson | Pearce! Smith! Krause ! Wallis! Spruce 5104! ae 2 ae 
. G. Rehb. f. 
Icones analytice. Labellum expansum -- Labellum a latere + Columna sine anthera antice! + Anthera+  Pollinaria tria + 
Tus is the largest flowered as well as one of the handsomest of the multitudes of Oncidia that are in cultivation at the 
present day. It was not until many years after Lindley named the species that the plant was imported in a living state 
from Ecuador. Twenty years ago it was exceedingly rare, and the desire of every orchidist was to possess a plant of 
it ; to-day it is to be met with in every orchid collection, large or small—a proof both of its popularity and of its easy 
culture. There is no other Oncidium possessing such bold and handsome flowers in which the sepals and petals are of 
almost uniform size; in the majority of Oncidia the lip is the largest and most conspicuous part of the flower. The clear 
yellow of the lateral sepals harmonises well with the quiet olive shaded tints of the other sepals, whilst all are in strong 
contrast to the varnished purple brown of the singularly shaped labellum. In growth, too, it is handsome; the ovoid 
bulbs are very large, the foliage long and dark green in colour, while the twisted and branched flower stems often attain a 
length of ten or twelve feet. The beauty of its flowers makes it a very conspicuous object for several weeks during early 
summer. The variety named Williamsianum is quite distinct, a heavy blotch of purple on each petal rendering it very 
handsome. 
Failure in the culture of this Oncidium is generally attributable to its being grown in too high a temperature 
It isa mountain orchid and must have a cool and moist treatment, differing therefore from the majority of Oncidia. 
It should be grown with such orchids as Odontoglossum crispum and Masdevallias, with a temperature ranging from 
50 deg. to 60 deg. F. It delights in a spot overshadowed by a wall and near a water tank. At all seasons it must have 
plenty of water, and in hot weather frequent overhead syringings. It does not need a distinct period of rest, but in winter 
should be kept drier than at other seasons. It blooms in May and June, and the best time for repotting is after the 
flowers are past. The compost should consist of fibrous peat with a good sprinkling of river sand, charcoal, and 
potsherds. 
Our plate is drawn from a plant in the collection of Miss Alice de Rothschild, Eythrope, Aylesbury, Bucks, 
