TWO MEXICAN HABENARIAS 
BY 
OakES AMES AND Louis O. WILLIAMS 
In the study of Mexican Habenarias the following 
new species and the new combination were found to be 
necessary. 
Habenaria umbratilis Ames & Williams sp. nov. 
Herbae terrestres usque ad 4.5 dm. altae. Folia ellip- 
tica vel elliptico-lanceolata, quinquenervia. Sepalum 
dorsale ovato-orbiculare, trinervium, cucullatum. Sepala 
lateralia lanceolato-triangularia, acuta vel obtusa, triner- 
via, arcuata. Petala lanceolata, acuta, arcuata uni- (vel 
bi-) nervia. Labellum trilobatum ; lobi laterales recurvati;: 
lobus medius anguste ligulatus. Columna generis. 
Erect leafy terrestrial herbs up to about 4.5 dm. tall. 
Stems slender, strict or flexuose, leafy (especially above 
the middle). Leaves 8-12 em. long and 2-3 cm. broad, 
elliptic to elliptic-lanceolate, acute, with five main nerves. 
Inflorescence up to about 10 em. long, crowded; bracts 
1-3 cm. long, lanceolate, acuminate, usually shorter than 
the ovary. Flowers small for the size of the plant. Dorsal 
sepal about 4 mm. long and 3.5 mm. broad, ovate-orbicu- 
lar, 3-nerved, cucullate. Lateral sepals 4.5-6 mm. long 
and 2.5-8 mm. broad, lanceolate-triangular, acute or ob- 
tuse, 8-nerved, arcuate. Petals about 3.5-4 mm. long and 
1.5-2 mm. broad, lanceolate, acute, arcuate, 1- (2-) nerved, 
with or without a small tooth at the base. Lip 3-lobed, 
the lobes slender and the lateral lobes longest; lateral 
lobes about 10 mm. long and about 1 mm. broad, spread- 
ing, recurved; mid-lobe 5-6 mm. long and about 1 mm. 
broad, narrowly ligulate. Column of the genus. 
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