Colchicum species I through R are found on this wiki page
Colchicum kesselringii - is a Central Asian species (native to Tajikistan and Afghanistan) that blooms with leaves present in late winter. It has small white flowers with a purple stripe on the back of the petals. Photos by Arnold Trachtenberg and John Lonsdale.
Colchicum kotschyi is a fall blooming Middle-Eastern species (Turkey, Iran, Iraq) that grows in bushy places on hillsides. Photo by Arnold Trachtenberg
Colchicum kurdicum (Bornm.) Stef., syn. Merendera kurdica Bornm., grows in alpine steppe in Turkey, Iran and Iraq, often over 2,000 meters. Photos of corms from Turkey by Dr. Dimitri Zubov:
Photos by John Lonsdale.
Colchicum laetum is a fall blooming species from the Caucasus. The Latin name translates as 'happy'. Photo 1-2 by John Lonsdale. Photo 3 of seed sown in January 2011 germinating in December 2013 by David Pilling.
Colchicum lusitanum is a species distribuited in Portugal, Spain, Italy and NW Africa. Similar to Colchicum bivonae in having the 'check pattern' on the tepals, but these are smaller and narrow. Photos and text by Angelo Porcelli
Colchicum luteum Baker is distributed from E. Afghanistan to C. Asia and W. Himalaya. The only yellow flowered species, it is small with the leaves short at flowering, but lengthening afterwards. It flowers near the snowline. Photos by John Lonsdale.
Colchicum macrophyllum from Turkey and Greek islands of Crete and Rhodes has pale lilac autumn flowers followed by very large pleated leaves in spring. It is one of the first to flower. Photo by John Lonsdale.
Colchicum mirzoevae (Gabrieljan) K.Perss. (syn. Merendera mirzoevae Gabrieljan) Photo of corms from Armenia provided by Dr. Dimitri Zubov
Colchicum montanum L. (syn. Merendera montana (L.) Lange, Merendera bulbocodioides Willd., Bulbocodium montanum (L.) Heynh.) It has early fall blooming flowers which rest on the ground followed by linear leaves. It is found in meadows and rocky slopes in Spain and Portugal. Photos by John Lonsdale.
Photo of corms by Dr. Dimitri Zubov
Colchicum munzurense is a spring bloomer from Turkey where it grows in screes and on cliffs. Photos by John Lonsdale.
Colchicum neapolitanum is a species distribuited in Portugal, Spain, France, Italy, Balkans and Greece. A lot of synonyms are associated to this smallish species. Photo and text by Angelo Porcelli
Colchicum pannonicum Although widely grown under this name, this plant is now regarded as an excellent clonal selection of Colchicum autumnale sometimes known under the cultivar name 'Nancy Lindsay'. It has a distinctive purple color on the tube. Photos by Arnold Trachtenberg and John Lonsdale.
Colchicum pusillum from Greece and Crete where it grows on open hillsides, blooms in early fall with leaves sometimes present or following soon. Photos by John Lonsdale.
Colchicum raddeanum (Regel) K.Perss. (syn. Merendera raddeana Regel) is native to Armenia and Georgia, often above 2,000 meters. Photo of corms by Dr. Dimitri Zubov, top row is Merendera kurdica, lower row M. raddeana.
Colchicum ritchii is from Israel. Photos by Gideon Pisanty
Colchicum rhodopaeum is a small flowering plant from Bulgaria. Photo by Arnold Trachtenberg
Colchicum robustum (Bunge) Stef. (syn. Merendera jolantae Czerniak., Merendera robusta Bungle). is a Middle Eastern Species found in Iran, Afganistan, and various other countries in the region. It grows in a variety of altitudes, having been collected from 1,000 m to well over 4,000 m (source). Photo of corms from Tadzhikistan by Dr. Dimitri Zubov.