This PBS wiki page features Crocus species A-H that bloom in the fall.
Crocus asumaniae from S. Turkey where it is found in evergreen and deciduous oak scrub in limestone has white or pale lilac flowers with a yellow throat. It blooms in the fall with leaves just showing at flowering time and is best grown in a frame or alpine house. Photos by Arnold Trachtenberg and Mark McDonough who writes: "The form I grow is from Jane McGary and it's a lovely pale lilac color. The flowers have a strong sweet fragrance. I find that it grows and flowers perfectly well outside in the garden." His photos were taken mid to late October, 2005.
Crocus banaticus This species, from Romania, blooms in early fall before its leaves. It is very beautiful with long tubed violet flowers and looks a little like an iris. It is best grown in cool moist conditions. Photos by Arnold Trachtenberg
This first photo by Bob Rutemoeller looks down on it and shows the lovely center with the divided style. The second from Mary Sue Ittner shows a moth resting on the flower after pollinating it.
Here is a white form of this species flowered and photographed by Rob Hamilton
Crocus biflorus subsp. melantherus Most C. biflorus bloom in late winter (a lot of the cultivars sold as C. chrysanthus are actually C. biflorus selections and hybrids), but a few forms flower in autumn, including this one. Leaves are slightly visible at flowering. This is one of several plants grown from seed obtained from the Goteborg Botanic Garden. Photo by Jane McGary
Crocus boryi is native to southern and western Greece, some Ionian islands, and Crete. It flowers in late fall. The photo shows the typical flowers, which are cream-white and have rather thick tepals. These plants are grown in a bulb frame in Oregon, from seed obtained from the Archibalds. Photo by Jane McGary
Crocus cancellatus ssp. cancellatus is a fall blooming Crocus from south Turkey that flowers before the leaves or just with the tips showing. It has slender pale blue flowers striped dark violet on the outside. It grows better in the protection of a bulb frame. Photos by Mark Mazer
Crocus cartwrightianus This species is thought to be the source of the sterile triploid Crocus sativus, or cultivated saffron. It is native to Greece and the Cyclades and blooms in the fall after the leaves are formed. The plants shown are a clone, CEH613, which is more vividly colored than the typical forms. A white form is also common in cultivation. Photos by Jane McGary and Mary Sue Ittner. The latter with a pollinator.
Crocus cartwrightianus 'Albus' Named by W. Herbert in honor of his friend Mr. Cartwright who was on the staff of the British Consulate at Istanbul in the early 19th century. Mr. Cartwright sent corms to Herbert from the island of Tenos. Photo by Arnold Trachtenberg Grown in New Jersey
Crocus goulimyi flowers with the leaves in autumn. There are lilac-blue and white forms with a long slender tube and rounded segments. Native to Greece where it grows in olive groves. Photo by Arnold Trachtenberg.
This photo by Mary Sue Ittner is of one with small white flowers.
Three photos of this beautiful species by Mark McDonough. The species seems variable, and the form I grow has very broad rounded tepals that overlap. They have a distinct 3-part symmetry about the flowers, reminiscent of C. banaticus, the 3 inner tepals white, contrasting richly with the lavender outer tepals. The sweetly fragrant flowers are held on long tubes that are surprisingly weather resistant. The 3rd photo was taken on November 13, 2005, after several nights of hard frost, but still sending up a succession of ethereal goblets.
The photo below, by Jane McGary, shows C. goulimyi in the wild on the Mani Peninsula, southern Greece, in a pretty combination with a subshrub of the mint family, perhaps a Marrubium.
Crocus hadriaticus photo by Jane McGary. This fall-blooming species is native to S. and W. Greece, the Peloponnesus, and nearby islands. Flowers are always white, sometimes with a purplish zone at the upper part of the tube on the outside. These photos, taken in Oregon in October, show a group of plants grown from seed collected in the wild and also a robust clone known in the trade as "var. chrysobelonicus," a name Mathew (1982) does not accept as valid. This is a good garden plant in northwestern Oregon, despite its provenance, which would suggest that it lacks cold-hardiness. Leaves are barely to well developed at flowering.
General information about this genus and about species that bloom at other times of the year is found in the PBS wiki Crocus page
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