Colchicum species A through H are found on this wiki page.
Colchicum x agrippinum see Colchicum Hybrids
Colchicum autumnale is an early fall blooming species with small pink-purplish flowers that is a common meadow plant in Europe. Photo 1 was taken by John Lonsdale. Photos 2-4 were taken by Nhu Nguyen at the UC Botanical Garden.
Colchicum autumnale 'Album' is a white cultivar. Photo by John Lonsdale
Colchicum autumnale 'Alboplenum' is a double white garden selection. Photo by Arnold Trachtenberg
Colchicum autumnale 'Pleniflorum' is a double pink variety. Photos by Janos Agoston
Colchicum baytopiorum from Turkey where it is found in rocky scrub has purplish-pink non-tessellated flowers. Photos by Arnold Trachtenberg. The last photo by Jane McGary was taken in the wild, showing this species growing in the Roman-era ruins of Termessos near Antalya, southwestern Turkey.
Colchicum bivonae The first plant picture below, grown from wild-collected seed, is an example of the pure species Colchicum bivonae, which is a parent of many of the large-flowered Colchicum hybrids, often in crosses with Colchicum speciosum. Colchicum bivonae contributes the tessellation (checkering) to these hybrids. The second photo shows a deep-colored colchicum that lost its label thanks to a flock of crows a few years ago. It may be 'Vesta'. Photos 1,2 by Jane McGary. Photo 3 by Bill Dijk.
A series of photos in habitat by Angelo Porcelli, in Basilicata - Southern Italy, showing a wide range of forms, with round tepals or pointed, more or less dark and tessellated. This is rarely seen on the cultivated ones, being usually clones.
Colchicum bivonae 'Apollo' This handsomely tessellated cultivar seems to be fairly reliable in my Maryland garden. About twenty years ago I received what was probably the same plant under the now discredited name Colchicum bowlesianum. Photo by Wayne Crist of a plant in the garden of Jim McKenney.
Colchicum boissieri has corms which travel horizontally. It is found in stony places in Greece and Turkey. Photo #2 shows this species in the wild on the Mani Peninsula, southern Greece, in late October. Photos by Jane McGary and John Lonsdale.
Photos from Mary Sue Ittner are of plants grown in Northern California. The first three show flowers blooming in October 2011 on an unusually cold day for that time of year they partially open. The last was taken on a sunny day several years earlier.
Colchicum bulbocodium see Bulbocodium vernum
Colchicum byzantinum see Colchicum Hybrids
Colchicum cilicicum is another species native to Turkey with pinkish-purple flowers and can be grown in open sunny borders. Photo by Arnold Trachtenberg
Colchicum cupanii is one of the smaller species, bearing 2-6 flowers and a couple of small leaves at the same time. Photos in habitat in Apulia-Italy by Angelo Porcelli, showing colour variants.
The first picture from Jane McGary is of a form purchased from Monocot Nursery in England as Colchicum cupanii subsp. bertolonii. It is an example of the smaller Colchicum species (cf. Colchicum hungaricum). This subspecies is not recognized by all and is considered to be subspecies cupanii by some. Another synonym is Colchicum bertolonii. The second photo by John Lonsdale is of another form he received as Colchicum cupanii ssp pulverulentum, another subspecies either not generally accepted or considered to be ssp. cupanii.
Colchicum glossophyllum is a small species that blooms early. One authority says is a variant of C. cupanii; however, as you can see in the photo, the leaves are much broader and longer at anthesis than is typical of C. cupanii as I have seen it. The deep purple anthers are quite striking. Photos by Jane McGary and John Lonsdale.