The artical on growing micro-mini sinningias is a good artical, however the list of plants is incomplete. This list is complete to the best of my research. I hope it helps.

Species and Varieties of Micro-miniature Sinningia:

Sinningia concinna: (Nichols)  The flowers from this plant are Light to dark lilac/purple/lavender with spotted throated. This plant is rare in cultivation. It has been used to create a large number of hybrids. :  

Sinningia pusilla: The flowers are tiniest of all. Miniature lilac-blue nodding flowers with a white throat, lilac/violet lines in middle of throat. The foliage is the same for these plants medium green with darker veins. Half-inch oval leaves veined dark green. Always in bloom. Needs terrarium.

Snowflake: (Clayberg) S. pusilla 'White Sprite' x unnamed mutant  The flower is white with three lobes on each petal. This propagated by cutting. This is harder to find.

Bright Eyes: (Clayberg) S. (pusilla x concinna) x S. pusilla The flower is larger, Purple slightly darker at edge of  throat. This hybrid is sterile but if it produces seeds they will not be true.

White Sprite: The flower pure white sport of  Sinningia pusilla. Smallest and best white flowered micro miniature sinningia. Very free flowering. Terrarium culture. This should come true from seed. It is possible to get some normal colored flowers in the group.

Little Wood Nymph: is a hybrid between Sinningia pusilla and Sinningia concinna. The flower is half way between the two species and upper two lobes dark purple, lower three lobes white light purple edging/light purple spotted throat. This plant is sought after by many collectors.

Quasar: (S. pusilla X S. conspicua) (A. Wojcik) This little plant is small but spreads out. has intricate lines and dots, and a trace of yellow, in its throat. Unfortunately, the downward-facing flowers don't display these markings well. Another perk is some fragrance from the S. conspicua parent! Although it's sterile, "sterile" plants in other groups have produced viable seeds-- with persistence!!

Ruffled Wood Nymph: 'Ruffled Wood Nymph' is the result of a cross between S. concinna and S. pusilla (named 'Wood Nymph'), which was in turn crossed back to S. concinna. The resulting seedlings were generally distributed as 'Wood Nymph Improved', and one was selected and named 'Ruffled Wood Nymph'. Many of the plants in the 'Wood Nymph' series are hard to tell apart

sp. Rio das Pedras Dark:

sp. Rio Das Pedras: Light to dark lilac, white flower.  Tiny stripe pointed edges leaves. This interesting species is a relatively new introduction, as yet without a formal name -- it was found in the vicinity of Rio das Pedras, in Brazil, hence the temporary descriptive name.  It is one of the small group of micro-miniature Sinningias, along with S. pusilla, S. concinna and their forms and hybrids.  Note the patterned and scalloped leaves, unlike those of concinna or pusilla.  Overall, S. sp. "Rio Das Pedras" is somewhat larger than the other micro-minis.  There have been no reports, at this writing, of hybrids involving this species.

Mighty Mouse: (Boggan)  Lavender flower.

Little Tiger: White, tiny purple spotted throat.

Carefree Regina:  (Bull)  Reddish-purple flowers, heavy spots in throat/ white lower petals.  Dark Green.

Freckles: (Clayberg) S. concinna x S. hirsuta   Corolla lilac on upper side, paler or yellowish on under side/purple spots in tube, upper lobes deeper lilac than the lower. Green/red veins.

Hircon:  (Nixon)  Lilac/purple spot in throat, paler yellow underside. (plant is like freckles but larger in all parts).

poupee:  (Nixon)  Medium lavender flower.

Razzmatazz: (Shinomura)  Upper two lobes purple, lower three lobes white with large purple spots.

Speckles:  Pastel version of freckles.

Star Eyes:  (Belanger) S. 'Bright Eyes' x S. 'Snowflake' Light lavender frilled edge, white in throat.

Treva McDaniel:  (Henry) Purple and white/smaller spots.

Dark Eyes:

Little Venus:

Doll Baby is not a micro-mini sinningia, S. pusilla x S. eumorpha (R. Katzenberger)