base, strongly dilated on the outer margin near the base 
and slightly dilated on the inner margin at the middle, 
upper margins minutely cellular-ciliolate. Lip adnate to 
the column near the base of the latter, strongly concave 
with erect sides, nearly sessile at the solid base, about 
2.7 mm. long in natural position, abruptly 3-lobed near 
the apex; middle lobe small, spatulate-oblong, 1 mm. 
long, rounded at the apex, concave, upcurved in natural 
position. Column very short, 2-2.5 mm. long including 
the terminal erect rostellar horn; clinandrium relatively 
long; anther oblong-cordate, stipitate. 
Ponthieva parviflora is unusual in the genus in be- 
ing arather tall species with slender habit and very small 
flowers. It is somewhat similar to P. parvula Schltr., 
but is vegetatively much larger with dissimilar petals 
which are narrowed above, and with a more distinctly 
3-lobed lip. It differs from P. Brittonae Ames in its taller 
habit, in its much smaller flowers, and in the venation of 
the petals, and in the dissimilar lip. 
A sheet of the same collection bearing three plants 
(subsequently received from the Field Museum of Nat- 
ural History) shows the following variations from the 
type. Plant 20-45 cm. tall. Stem with only three 
sheaths. Leaves elliptic, about 5-6 cm. long, 2.1 cm. 
or less broad. Raceme 9-15 em. long. 
Yucatan: Tuxpefia, Campeche, January 19, 1982, C. L. Lun- 
dell 1213, (Tver in Herb. Univ. Mich.). 
[ 40 | 
