Sigmatostalix macrobulbon Kraenzl. 1922

Photo by Pontus Aratoun and his Flickr Photo Website

Full shade Warm Fall and Winter

Common Name The Large-Bulbed Sigmatostalix

Flower Size .12" [.3 cm]

Found in Costa Rica and Panama in windy, tropical lowland rainforest at elevations of sealevel to 1260 meters but most often between 700 to 900 meters as a miniature sized, warm growing epiphyte on smaller branches that occurs at elevations of 400 to 1200 meters with elliptic-ovate, laterally compressed pseudobulbs with 2 to 3, basal, foliaceous bracts with 2 apical, subcoriaceous, linear-lanceolate leaves that blooms on a basal, erect, racemose, 4 3/4 to 6" [12 to 15 cm] long, longer than the leaves, several flowered inflorescence arising on a mature pseudobulb and occuring in the fall and winter.

"The pure yellow flowers, sometimes with a pair of pale brown flecks at the base of the petals, and the large, suborbicular, strongly reflexed lip provided with a massive callus, permit easy identification of this species among Costa Rican relatives." Pupulin 2003

Synonyms Oncidium macrobulbon [Kraenzl] Chase & NH Wms. 2008; Oncidium reichenbachianum (Kraenzl.) M.W.Chase & N.H.Williams 2008; Sigmatostalix reichenbachiana Kraenzl. 1922;

References W3 Tropicos, Kew Monocot list , IPNI ; Das Pflanzanreich Regni Vegetabilis Conspectus Odontoglossum/Oncidium Kranzlin 1922 drawing ok; Repert. Sp. Nov. Regni. Veg. Beih. 19: 69. Costa Rica Schlechter 1923; Icones Planetarum Tropicarum Plate 1588 Atwood 1993 drawing hmm to ok; Fieldiana Biology, Flora Costa Ricensis Family # 39 Orchidaceae, subtribes Maxillariinae and Oncidiinae Atwood & Mora 1999 drawing fide; Manual de Plantas de Costa Rica Vol 3 Hammel, Grayum, Herrera and Zamora 2003 drawing ok; Harvard Papers in Botany, Vol. 8, No. 1, pp. 3559 Pupulin 2003 drawing fide; Orchid Species Culture Oncidium/Odontoglossum Alliance Bakers 2006; AOS Bulletin Vol 77 No 12 2008 as Oncidium macrobulbon; AOS Bulletin Vol 77 No 12 2008 as Oncidium reichenbachianum;