Aulosepalum Garay, gen. nom. nov. 
Basionym: Gamosepalum Schltr. in Beih. Bot. Centralbl. 
37(2): 429, 1920, not Hausskn. 1897. 
Etymology: Au/os = tube and sepalum = sepal, in reference 
to the sepaline tube. 
Sepals subequal, connate to middle, forming a distinct, more 
or less cylindrical tube which is suberect to perpendicular on top 
of ovary. Petals connivent with dorsal sepal, basally decurrent. 
Lip with a long claw, adnate to tube, lamina with marginal 
thickenings at base. Column half-way adnate to dorsal sepal, 
free portion suberect, basally produced in a distinct foot; 
stigmata 2, confluent or closely approximate; rostellum short, 
triangular in outline, emarginate, soft; clinandrium funnel- 
shaped. Anther ovate-cucullate, obtuse; pollinia with a round 
viscidium. Ovary cylindric, somewhat twisted. 
Plants stout, erect, xerophytic. Roots fasciculate, fusiform. 
Leaves, when present, basal, long-petiolate. Stem completely 
enclosed by more or less chartaceous, hyaline sheaths. Inflo- 
rescence many-flowered. Flowers of medium size, erect on top of 
ovary. 
TYPE: Spiranthes tenuiflora Greenm. 
Four species native to Mexico and Guatemala. 
Index to species 
Aulosepalum hemichrea (Lindl.) Garay, comb. nov. 
Basionym: Spiranthes hemichrea Lindl., Gen. and Sp. Orch. PI. 473, 
1840. 
Aulosepalum Nelsonii (Greenm.) Garay, comb. nov. 
Basionym: Spiranthes Nelsonii Greenm. in Proc. Amer. Acad. Sci. 35: 
307, 1900. 
Aulosepalum ramentaceum (Lind!.) Garay, comb. nov. 
Basionym: Spiranthes ramentacea Lindl. in Ann. Nat. Hist. 4: 384, 1840. 
Aulosepalum tenuiflorum (Greenm.) Garay, comb. nov. 
Basionym: Spiranthes tenuiflora Greenm. in Proc. Amer. Acad. Sci. 35: 
308, 1900. 
Beadlea Small, Flora SE United States 219, 1903. 
Etymology: In honor of Chauncey Delos Beadle (1866-— 
1950), an American botanist. 
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