Spiranthes pseudopyramidalis is allied to S. pyramida- 
lis Lindl. from which it is distinguished by the shape of 
the lip which is straight at the base and not geniculate, 
by the apex which is sharply recurved and not straight, 
and by the calli which are glabrous and not densely pu- 
bescent. The bracts of the stem and of the inflorescence 
are whiter in color. 
Spiranthes pubicaulis L. O. Williams sp. nov. 
Herbae terrestres, erectae, graciles, usque ad 21 cm. 
altae. Folia ignota. Inflorescentia brevis, plusminusve 
laxa. Sepalum dorsale lanceolatum, acutum, trinervium, 
basi leviter concavum. Sepala lateralia triangulari-lanceo- 
lata, acuta, leviter arcuata, trinervia. Petala lanceolata, 
faleata, tri- usque ad quinque-nervia. Labellum oblongo- 
panduratum, trinervium. Columna generis. 
Erect, slender, terrestrial herbs, up to 21 cm. tall. 
Scape slender, pubescent from base to apex, with three 
to four semiamplexicaul, subscarious, lanceolate to ovate- 
lanceolate bracts. Leaves unknown. Inflorescence short, 
rather lax, up to about 15-flowered. Dorsal sepal about 
6 mm. long and 3 mm. broad, lanceolate, acute, densely 
pubescent dorsally, 8-nerved, somewhat concave at the 
base. Lateral sepals 6-7 mm. long and 2.5-8 mm. broad, 
triangular-lanceolate, acute, slightly arcuate, 3-nerved, 
densely pubescent dorsally. Petals 5-6 mm. long and 
about 2 mm. broad, lanceolate, faleate, 8- to 5-nerved. 
Lip about 8 mm. long and 4 mm. broad, oblong-pandu- 
rate, obscurely pubescent, the three main nerves with 
lateral branches; terminal half suborbicular, crenulate, 
papillose above; basal half suborbicular, attenuated to 
the base and with two marginal callus-thickenings, pubes- 
cent on both sides at the base. Column about 5 mm. long; 
rostellum short, subulate. Ovary densely pubescent. 
Mexico: ‘‘Jaltipan,’’ Vera Cruz, July 5, 1910, Oreutt 5056 (Tyrer 
in Dudley Herbarium, Stanford University No. 155015). 
[ 234 | 
