<p>SUBGENUS Sigmatopetalum SECTION Barbata SUBSECTION Barbata
</p><p>Distribution: Indo-China to NW. Pen. Malaysia (41 CBD LAO MYA THA VIE 42 MLY)
Distribution Thailand, Cambodia and Laos; 300–1300 m altitude.
</p><p>Homotypic Synonyms:
</p>
<ul><li>Cypripedium callosum Rchb.f., Gard. Chron., n.s., 26: 326 (1886).</li></ul><p>Cordula callosa (Rchb.f.) Rolfe, Orchid Rev. 20: 2 (1912).
</p>
(* Basionym/Replaced Synonym)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/25064784@N00">sunoochi</a> from Sapporo, Hokkaido, Japan
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/snotch/45713153364/">[Indo-China to NW. Pen. Malaysia] Paphiopedilum callosum '#2' (Rchb.f.) Stein, Orchid.-Buch: 457 (1892)</a>