ADDISONIA ; : 59 
(Plate 30) 
ONCIDIUM UROPHYLLUM 
Tail-leaf Oncidium 
Native of Antigua and Brazil 
Family ORCHIDACEAE ORCHID Family 
Oncidium urophyllum Lodd.; Lindl. Sert. Orch. under pi. 48. 1841. 
An epiphytic plant with long stiff leaves, which are equitant and 
crowded at the base of the stem, and a racemose inflorescence. 
The leaves are rather fleshy, almost ee very acute, and 
with a sharp keel on the back; they measure up to six inches long 
and nearly a half inch wide. "The pennies is slender, up to eight 
inches long, with several scarious distant bracts, and is terminated 
ellow 
y a loose raceme of six to eight ye or ge ta sparingly marked 
with chestnut. The acute sepals are about one fifth of an inch long 
and a third as broad, and are marked toward eh base with chestnut; 
almost to the apex into a two-toothed body. The petals are 
pasieag? hse: obtuse at the apex, apiculate, sometimes a little 
er than the sepals and about half as broad as long, marked at 
the an with chestnut. The glabrous lip is sessile, a little over 
a half inch long isso about a half inch wide “2 the rounded wae 
inch wide, cordate at the base, and with the apex notched; the 
crest is white, marked with chestnut. The column is about chee. 
sixteenths of an inch long, and the obtuse wings about one eighth 
of an inch long. 
The plant from which the illustration was made was collected in 
1913 by J. N. Rose on the island of Antigua, and flowered at the 
New York Botanical Garden in April, 1915. This species belongs 
to the section Equitantia, characterized by the rather fleshy con- 
duplicate leaves which are equitant at the base. In addition to the 
one here under consideration, fourteen other species of this section 
are accredited to the West Indies by Cogniaux. In cultivation the 
plant requires a rather warm house, not too moist. 
Th erican genus Oncidium, comprising about three hundred 
and twenty-five species, is widely distributed from Mexico to South 
America, in the West Indies, and peninsular Florida, the greatest 
number of species being confined to the mainland. Only three are 
known to occur within the borders of the United States, and these 
in southern peninsular Florida. Most of the species are provided 
