The vast majority of orchids grown in the home are epiphytes, meaning they live in nature by clinging to trees or even stones. The roots of these plants are highly specialized organs that differ dramatically from normal plant roots. Of course, it's hard to generalize about anything when it comes to orchids. This is the single largest group of plants in the world, so for every rule, there are 100 exceptions.
Like most monocots, orchids generally have simple leaves with parallel veins, although some Vanilloideae have reticulate venation. Leaves may be ovate, lanceolate, or orbiculate, and very variable in size on the individual plant. Their characteristics are often diagnostic. They are normally alternate on the stem, often folded lengthwise along the centre ("plicate"), and have no stipules. Orchid leaves often have siliceous bodies called stegmata in the vascular bundle sheaths (not present in the Orchidoideae) and are fibrous.
Below are orchid species listed alphabetically, you can go from species to species by scrolling to the top or bottom of any page to find another alphabet bar such as this one below. All names are listed alphabetically including synonyms, so if you see your plant name without a link, there will be a reference there to procede to the name that is on this list with a link to the picture as well as cultural information for your species.
A pollinium is a waxy mass of pollen grains held together by the glue-like alkaloid viscin, containing both cellulosic strands and mucopolysaccharides. Each pollinium is connected to a filament which can take the form of a caudicle, as in Dactylorhiza or Habenaria, or a stipe, as in Vanda. Caudicles or stipes hold the pollinia to the viscidium, a sticky pad which sticks the pollinia to the body of pollinators.
This type of orchid has over 200 species and has a star-shaped appearance. Most of them have small- to medium-sized blooms and come in colors such as yellow, white, or light green, although most of them are white. The flower has a wonderful fragrance, needs even amounts of water, and prefers temperatures between 60 and 80 degrees Fahrenheit, mainly because they are not a bulb plant and therefore cannot store water. They also look beautiful in hanging baskets and pots.
Brassia, Comparettia, Odontoglossum, Polystachya, Cochleanthes, Tolumnia, Trichocentrum, Brassavola, Psychilis CC Image courtesy of Arne and Bent Larsen on Wikimedia Commons | Catasetum, Cymbidium CC Image courtesy of http://www.larsen-twins.dk on Wikimedia Commons | Cephalanthera CC Image courtesy of Sramey on Wikimedia Commons | Dichaea, Eulophia, Galeandra, Trichoglottis, Lycaste, Stanhopea, Caularthron, Domingoa, Prosthechea, Dendrobium, Goodyera, Stenorrhynchos, Pogonia, Gymnadenia CC Image courtesy of Orchi on Wikimedia Commons | Dipodium CC Image courtesy of David Lochlin on Flickr | Ionopsis, Campylocentrum CC Image courtesy of Maarten Sepp on Flickr | Macradenia CC Image courtesy of Maarten Sepp on Flickr | Koellensteinia CC Image courtesy of Alex Popovkin on Flickr | Leochilus CC Image courtesy of Marcos Antonio Campacci on Wikimedia Commons | Oeceoclades, Bletia, Chiloschista, Renanthera, Miltonia, Brachionidium, Cattleya, Lepanthopsis, Nidema, Scaphyglottis, Trichosalpinx, Eria, Coelogyne, Cyclopogon, Eltroplectris, Eurystyles, Platythelys, Prescottia, Psilochilus, Triphora, Paphiopedilum CC Image courtesy of Dalton Holland Baptista on Wikimedia Commons | Oncidium CC Image courtesy of Calyponte on Wikimedia Commons | Arethusa CC Image courtesy of Chris Meloche on Wikimedia Commons | Arundina CC Image courtesy of Kevin Gepford on Wikimedia Commons | Calopogon CC Image courtesy of Bob Peterson on Flickr | Cleisostoma CC Image courtesy of Earth100 on Wikimedia Commons | Dendrophylax CC Image courtesy of Mick Fournier on Wikimedia Commons and CC Image courtesy of Big Cypress National Preserve on Flickr | Micropera, Crepidium CC Image courtesy of Raabbustamante on Wikimedia Commons | Taeniophyllum CC Image courtesy of Airborne Pilot on Flickr | Corallorhiza CC Image courtesy of Wsiegmund on Wikimedia Commons | Maxillaria CC Image courtesy of Walter on Flickr | Govenia CC Image courtesy of Sanfelipe on Wikimedia Commons | Isochilus CC Image courtesy of Patricia Harding on Wikimedia Commons | Lepanthes CC Image courtesy of Quimbaya on Flickr | Elleanthus CC Image courtesy of Philipp Weigell on Wikimedia Commons | Pleurothallis CC Image courtesy of KENPEI on Wikimedia Commons | Restrepiella CC Image courtesy of Moises Béhar on Wikimedia Commons | Bulbophyllum CC Image courtesy of Montrealais on Wikimedia Commons Calanthe CC Image courtesy of Qwert1234 on Wikimedia Commons | Phaius CC Image courtesy of Hectonichus on Wikimedia Commons | Spathoglottis CC Image courtesy of Vaikoovery on Wikimedia Commons | Calypso CC Image courtesy of Walter Siegmund on Wikimedia Commons | Tipularia CC Image courtesy of TheAlphaWolf on Wikimedia Commons | Malaxis CC Image courtesy of Bernd Haynold on Wikimedia Commons | Oberonia CC Image courtesy of Ramesh Meda on Flickr | Anoectochilus CC Image courtesy of Badlydrawnboy22 on Wikimedia Commons | Cranichis CC Image courtesy of Americo Docha Neto on Wikimedia Commons | Mesadenus, Pteroglossaspis CC Image courtesy of NC Orchid on Flickr | Pelexia CC Image courtesy of Elena Gaillard on Wikimedia Commons Ponthieva CC Image courtesy of Jose Lacruz on Wikimedia Commons | Spiranthes CC Image courtesy of Eric in SF on Wikimedia Commons | Zeuxine CC Image courtesy of Panoso on Wikimedia Commons Dactylorhiza CC Image courtesy of Uoaei1 on Wikimedia Commons | Habenaria CC Image courtesy of J.M.Garg on Wikimedia Commons | Ophrys, Pseudorchis CC Image courtesy of Hans Hillewaert on Wikimedia Commons | Orchis CC Image courtesy of Algirdas on Wikimedia Commons | Platanthera CC Image courtesy of Enrico Blasutto on Wikimedia Commons | Epipactis CC Image courtesy of Dcrjsr on Wikimedia Commons | Listera CC Image courtesy of Superior National Forest on Flickr | Sobralia CC Image courtesy of João Medeiros on Flickr | Broughtonia CC Image courtesy of Walter on Flickr Masdevallia CC Image courtesy of trixty on Flickr | Isotria CC Image courtesy of Jason Hollinger on Flickr | Flickingeria CC Image courtesy of Averater on Wikimedia Commons | Cleistesiopsis CC Image courtesy of Charly Lewisw on Wikimedia Commons | Cypripedium montanum CC Image courtesy of Bill Bouton on Flickr | Cypripedium reginae CC Image courtesy of Orchi on Wikimedia Commons | Disperis, Encyclia, Epidendrum, Vanilla planifolia, Vanilla barbellata CC Image courtesy of Malcolm Manners on Flickr | Govenia CC Image courtesy of Bosque Village on Flickr | Psychopsis CC Image courtesy of LadyDragonflyCC – >;< on Flickr | Aplectrum CC Image courtesy of Fritz Flohr Reynolds on Flickr
If your orchid is potted in plastic, place it in an empty bowl, then add water. If you place the plastic pot in an already full bowl of water, the water will push the bark up and out, floating it away from the orchid roots. In this case, add water to just below the lip of the pot and let it sit for 10 to 15 minutes, then drain and return the orchid pot to its place.
The orchid plant is also unique in its morphology (form or structure). We can begin with the leaves and work our way down to the roots. The leaves of many orchids in cultivation are unique in that they are specifically designed for water conservation (as is true for almost every orchid structure). They have a heavy waxy leaf coating and specialized stomata (openings through which the leaf “breathes”) that help to prevent water loss during transpiration (the act of the plant “breathing”). Many orchids utilize CAM photosynthesis as well, which in essence means that the plants collect materials during the day and then process them at night.
With ageing, the pseudobulb sheds its leaves and becomes dormant. At this stage, it is often called a backbulb. Backbulbs still hold nutrition for the plant, but then a pseudobulb usually takes over, exploiting the last reserves accumulated in the backbulb, which eventually dies off, too. A pseudobulb typically lives for about five years. Orchids without noticeable pseudobulbs are also said to have growths, an individual component of a sympodial plant.
Water thoroughly. When you do water, do it like you mean it. Different growers have different rules, but many professional growers turn on their sprinklers for 8 or more minutes. Successful home-growers sometimes dunk their plants, pots and all, into a bucket or sink of water. Some varieties, such as vandas, can be left floating in water for a surprisingly long time. The idea is to make sure the velamen is completely saturated. You want tiny droplets hanging on the roots after watering. This means the plant is completely hydrated.