 Silva Orchids ENGLISH Second generation nursery providing the highest quality seedling and mericlone hybrids and species. Joseph and Anthony Silva. Neptune, New Jersey, USA. |
| Simpson Orchids ENGLISH Specializing in Sarcochilus. Mt. Mee, Queensland, Australia. |
 Sioux Falls Orchid Club ENGLISH Orchid club in the Sioux Falls and greater vicinity aimed at sharing the interest in growing and cultivating orchids.Ê Membership, meeting and contact info. Sioux Falls, South Dakota, USA. |
| Sky Island Orchids ENGLISH Flasks, community pots, seedlings and blooming size plants available. Bill and Linda Mitchell. Yamhill, Oregon, USA. |
| 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. |
 Slipper Orchid Forum ENGLISH Message board for Paphiopedilum, Phragmipedium, Mexipedium, Selenipedium, and Cypripedium enthusiasts. |
| Slipper Orchid Info ENGLISH Paphiopedilum, Phragmipedium, and Cypripedium taxonomy. Blooming seasons and awards data. Images and literature scans. Stephen Manza. Gaithersburg, Maryland, USA. |
| Slipper World ENGLISH Paphs and Phrags for sale. Erick Malsbury. San Antonio, Texas, USA. |
| Slipper-Web ENGLISH Slipper orchid photo gallery. Photos by Chuck Acker, Allen Black, and others. Illustrations by Jenny Augst. |
| SlipperOrchid.com ENGLISH Paphiopedilum and Phragmipedium information. Matt Pedersen. Lincolnwood, Illinois, USA. |
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