 | Siam Orchids (USA) ENGLISH / SPANISH / GERMAN / ITALIAN / DUTCH
Specializing in Vandas and Ascocendas. Glenn Behrman. Homestead, Florida, USA.  |
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| Silk Synergy ENGLISH
Offering orchid art, and art-to-wear, based on original silk paintings by Julianne Jennings (Georgia), Merridee Joan Smith (California), Karen Sistek (Washington), and Janet Haefner (Arizona). |
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| Silva Orchids ENGLISH
Second generation nursery providing high quality seedling and mericlone hybrids and species. Joseph and Anthony Silva. Neptune, New Jersey, USA. |
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 | Sioux Falls Orchid Club ENGLISH
Orchid club in the Sioux Falls area aimed at sharing the interest in growing and cultivating orchids. Membership, meeting and contact info. Sioux Falls, South Dakota, USA. |
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| Slipper Orchid Alliance ENGLISH
Resource center dedicated to the slipper group of orchids including Paphiopedilum, Phragmipedium, Cypripedium, Mexipedium and Selenipedium. Quarterly newsletter. Pittsburgh, Pennsylvania, USA. |
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 | Slipper Orchid Forum ENGLISH
Message board for Paphiopedilum, Phragmipedium, Mexipedium, Selenipedium, and Cypripedium enthusiasts. |
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| Slipper Orchid Info ENGLISH
Paphiopedilum, Phragmipedium, and Cypripedium taxonomy. Blooming seasons and awards data. Images and literature scans. Stephen Manza. Gaithersburg, Maryland, USA. |
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| SlipperOrchid.com ENGLISH
Paphiopedilum and Phragmipedium information. Matt Pedersen. Lincolnwood, Illinois, USA. |
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| Slippertalk.com ENGLISH
Web-based forum to discuss Paphiopedilum, Phragmipedium, Cypripedium, Mexipedium and Selenipedium orchids. Topics include culture, taxonomy, breeding, production, awards, pests, photographs, sale/trade, and a wanted section. |
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| SLO Gardens Orchids ENGLISH
Bulbophyllum, Cattleya, Dendrobium, Dendrochilum, Dracula, Masdevallia, Oncidium, and other genera available. Established in 1985. Rudy and Anne Bachmann. Arroyo Grande, California, USA. |
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| Slovenian Orchid Society (DLOS) SLOVENIAN / ENGLISH
Membership, activities,and events info. Also articles and a photo gallery. Founded in 2003 in Ljubljana, Slovenia. |
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| Sobha Orchids ENGLISH
Orchid genera offered includes Phalaenopsis, Vanda, Cattleya, Dendrobium, and Oncidium. Culture notes. Kanimangalam, Kerala, India. |
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| Sociedad Colombiana de Orquideologia SPANISH / ENGLISH
Membership, contact, and activities information. List of orchid species found in Colombia. Publishers of the magazine "ORQUIDEOLOGIA", and several other printed paper information sources. Founded in 1964. Medellín, Colombia. |
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| Sociedad de Orquideología del Caroní (SOC) SPANISH
The Orchid Society of Caroni focuses on educational activities and the conservation of orchids found in the Guayana Region. Puerto Ordaz, Ciudad Guayana, Bolivar State, Venezuela. |
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