shorter with spreading acuminate apices above. The 
withered remnants of leaves indicate oblong-lanceolate 
blades. Raceme densely many-flowered, 8-9 cm. long, 
1-(rarely) 2 cm. in diameter. Floral bracts white, trans- 
lucent, thinly scarious, ovate, long-acuminate, up to 1.7 
em. long, concave below, with three green veins. Ovary 
densely glandular, ellipsoid in anthesis. Flowers small, 
horizontally spreading; perianth campanulate; sepals 
densely glandular on the outer surface. Dorsal sepal o- 
rate-oblong, concave, about 6.5—6.9 mm. long and 8mm. 
wide, acute, 3-nerved. Lateral sepals linear-lanceolate or 
oblong-lanceolate, 6.2—7.1 mm. long, about 2 mm. wide 
at the base, acute, 1-nerved with a less distinct supple- 
mentary nerve, asymmetric at base. Petals strongly ad- 
nate to the dorsal sepal forming a galea, oblong-linear, 
little shorter than the dorsal sepal, 6-7 mm. long, about 
1.1 mm. wide, lightly incurved and oblique, rounded to 
subacute at the apex, I-nerved. Lip oblong-ovate, pan- 
durate, constricted near the apex, retuse and apiculate at 
the tip, rounded at the sessile base, about 7.2 mm. long, 
3.5-4 mm. wide below the middle, anterior portion some- 
what narrower and transversely oval. Column slightly 
dilated above, minutely papillose on the anterior sur- 
face, terminating in a triangular-lanceolate rostellar 
point. Anther conspicuous, broadly ovate-cordate, con- 
‘ave, very shortly stipitate. 
Spiranthes albovaginata, while vegetatively similar to 
S. Arséniana Kriinzl., has apparently no near allies. 
Mexico, near Chalma, in loamy earth under oaks. At about 2500 
meters altitude. April 20, 1933. Erik M. Ostlund 2267 (Collector Juan 
G.) (Tyrer in Herb. Ames No. 41427). 
Spiranthes densiflora C. Schweinfurth sp. nov. 
Herba terrestris, elata. Caulis vaginis scariosis laxis 
omnino obtectus. Folia marcescentia, distantia. Racemus 
[104 | 
