having 1-nerved sepals and very dissimilar blunt anthers. 
Among Central American species, it is allied to S. gra- 
mined Lindl., but is distinguished from that species by its 
stouter roots, smooth inflorescence and smaller flowers. 
Another collection, Arséne 5476, consists of uni- 
formly smaller plants 11-22 cm. high and racemes 3-10 
em. long. One of its flowers shows an acute lateral sepal 
about 8.9 mm. long, petals which are somewhat narrowed 
and obtuse at the tip and a lip which is trilobulate at the 
truncate apex, about 3.6 mm. long and definitely shorter 
than the sepals. In this collection the anterior portion of 
the lip is more erose and crispate than in the type. 
Mexico, State of Morelos, between Tepotzlan and San Jaunico. 
Grassy patches between lava. At 1600 meters altitude. March 7, 
1933. Erik M. Ostlund 2160 (Collector Benj. Cruz) (Type in Herb. 
Ames No. 41425): State of Michoacan, vicinity of Morelia, Jesis del 
Monte. March 28, 1910. Bro. G. Arséne 5476. (U.S.Nat. Herb. No. 
1032524), 
Spiranthes albovaginata C. Schweinfurth sp. nov. 
Herba terrestris. Radices fasciculatae, incrassatae. 
Caulis vaginis albo-scariosis omnino tectus. Folia marces- 
centia, prope plantae basim. Racemus dense multiflorus. 
Flores extus glandulosi; perianthium campanulatum, pa- 
tens. Sepalum dorsale ovato-oblongum, concavum. Se- 
pala lateralia oblongo-lanceolata, acuta. Petala sepalo 
dorsali valde adhaerentia, oblongo-linearia. Labellum 
oblongo-ovatum, prope apicem utrinque constrictum ig- 
itur panduratum, apice retuso-apiculatum. Columna cum 
acumine conspicuo. 
Plant terrestrial, 55-59 em. high. Roots fasciculate, 
numerous, slender-fusiform. Stem glabrous below, dense- 
ly glandular near the raceme, entirely invested by scari- 
ous white green-veined sheaths which are close and bear 
marcescent leaves on the lower portion and which are 
[ 103 | 
