IV. ANOTHER HEXALECTRIS FROM MEXICO 
The first described species of Hewalectris, H. spicata 
(Walt.) Barnh., occurs from West Virginia (Pendleton 
County), Maryland and Virginia, south to Sarasota Coun- 
ty, Florida and west to Indiana, Kentucky, Missouri, 
Arkansas, Arizona, New Mexico and Mexico, where it 
was recently discovered in the State of Nuevo Leon. 
The second described species, H. mexicana Greenm., oc- 
curs in western Texas and generally throughout Mexico. 
Recently my colleague, Dr. LL. O. Williams, described 
two new species from Mexico, H. parviflora and AH. 
brevicaulis (Amer. Orch. Soe. Bull. 9, (1940) 125, t.). 
The species in question, Hewalectris revoluta, is most 
closely related to H. spicata. It is a large plant bearing 
comparatively few distant flowers. When the flowers are 
fully expanded the sepals and petals are conspicuously 
revolute, often being tightly rolled back a third or more 
of their length. Asshown by the figures, the lip (fig. 2) 
is distinctly different in the shape and lobing from that 
1. Hevalectris spicata, 
lip, spread out, taken 
from a_ typical plant 
from Florida, two and 
one half times natural 
size. 2. Hexalectris rev- 
oluta, lip, spread out, 
two and one half times 
natural size. 
Drawn May 1941 by 
G. W., Ditton 
of H. spicata (fig. 1). Although the lamellation of the lip 
is somewhat similar in the two species, it is not so 
prominent in HZ. revoluta. Instead of five prominent 
keels at the base of the middle lobe asin H. spicata, the 
lip of H. revoluta has four keels which are only slightly 
raised. 
[18 ] 
