lanceolate, acute, somewhat falcate, 3-nerved, pubescent 
dorsally. Petals 11-14 mm. long and 1-1.5 mm. broad, 
linear, acute, slightly falecate, narrowest at the base, 1- 
nerved, adnate to the dorsal sepal above. Lip 13-17 mm. 
long and 5-6.5 mm. broad, oblong-oval, subpandurate, 
sharply constricted at the base and with two small basal 
auricles, short-unguiculate, pubescent on both sides at 
the base. Column 10-12 mm. long, prominently pubes- 
cent on the inner side, especially toward the base. 
Mexico: in soft black soil, region of Villa Juarez, State of San Luis 
Potosi, altitude ca. 1900 m., October 27, 1936, Dino 6497; on rocks 
in leaf mold, mountains above Tamasopo, State of San Luis Potosi, 
flowers pale pink, altitude ca. 700 m., August 20, 1937, Dino 6931 
in part; in loose black soil, mountains in district of Juarez near Cer- 
ritos, State of San Luis Potosi, altitude ca. 1900 m., longitude 100° 
49’ west, latitude 22°10’ north, flowers pale pink, September 3, 1936, 
Nagel & Dino 6187 (Tyrr in Herb. Ames No. 51255); in loose black 
soil, mountains near Cerritos, State of San Luis Potosi, altitude 1800 
m., longitude 100°16’ west, latitude 22°26’ north, flowers pale pink, 
September 22, 1936, Nagel & Dino 6343. 
Spiranthes Nagel is closely allied to §. durangensis 
A. &S., from which it is distinguished by its broad leaves 
which are present at flowering time. In S. durangensis 
the leaves are lacking at anthesis or, if present, are lan- 
ceolate. The lip of S. Nagel is only slightly constricted 
toward the middle and has basal calli which form small 
auricles; in S. durangensis the lip is prominently con- 
stricted near the middle and lacks basal calli or auricles. 
The species is dedicated to Mr. Otto Nagel, one of the 
most discriminating of the collectors of Mexican Orchid- 
aceae. 
Spiranthes pseudogoodyerioides L. O. Williams 
sp. nov. 
Herbae parvae, terrestres, usque ad 2 dm. altae. Folia 
rosulata, ovalia, oblonga vel oblongo-ovata, acuta vel 
leviter acuminata. Sepalum dorsale triangulari-lanceola- 
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