486 ORCHIDS. 
thorn. They are developed in May or June, lasting about 
a month. When well managed this species flowers very 
freely, small plants producing quite a crowded whorl. It 
is a native of Costa Rica, where it grows on oaks and 
other trees at an elevation of 5,o000ft. to g,oooft. Intro- 
duced in 1848. 
Plate; Fig. 108; Botanical Magazine, t. 4654. 
T. tortilis—An old and favourite garden Orchid, being 
easy to manage, and a free-flowering, ornamental plant. Its 
pseudo-bulbs are from 2in. to 4in. long, tin. wide, much 
flattened, dark green, one-leaved. Leaves leathery, ovate, 
6in. long, keeled, dark green. Flowers on decumbent stalks, 
usually solitary; sepals and petals spreading, narrow, 
2in. long, spirally twisted, pointed, their colour brown, 
with a yellowish border; lip folded, and forming a tube 
at the base, the upper part broad, spreading, 14in. across, 
lobed, white, with crimson spots, almost wholly crimson 
inside the tube. This species blooms very prolifically, small 
plants when in vigorous health producing a score or more 
flowers, which remain fresh about a month. It blossoms 
in summer, and sometimes again in winter. A native of 
Mexico; introduced in 1835. 
Fig. 109; Botanical Magazine, t. 3739. 
