|Synonyms||S. multiflorum, S. urubambae, S. villuspetalum|
|Citation ||Bitter: Repert. Spec. Nov. Regni Veg. 11: 389. 1912.||
Solanum violaceimarmoratum (violaceimarmoratum meas “purple mottled” and probably refers to the stems) is native to the eastern slopes of the Bolivian Andes, at elevations of roughly 6500 to 11200 feet. An unusual species, thought not to be closely related to other wild potatoes. Very tall plants, reaching nine feet in height. Stolons three feet or more. Tubers reaching two to three inches in length, more in cultivation. Some sources report that the tubers are moniliform, but I haven’t observed this. Tuber skin ranges from white to purple and flesh color white to light yellow. Tubers become dark purple with exposure to light. Purple flowers. Berries conical.
This species can survive frosts down to 27 degrees F (-3 C) (Li 1977), about the same as the domesticated potato. Even though it grows at relatively high elevations, It has poor frost resistance compared to most wild potatoes, most likely because the eastern slopes of the Andes to which it is native are warmed by updrafts from the Amazon basin (Smillie 1983). It grows in sandy clay soils, developing best in loose, moist soils with high organic matter (Patiño 2008).
Subramanian (2017) found that at least some accessions of this species have unusually high potassium content.
|Condition||Type||Level of Resistance||Source|
|Alfalfa Mosaic Virus||Virus||Resistant||Horvath 1989|
|Cucumber Mosaic Virus||Virus||Resistant||Horvath 1989|
|Frost||Abiotic||Not resistant||Li 1977, Smillie 1983|
|Golden nematode (G. rostochiensis)||Invertebrate||Resistant||Nagaich 1980|
|Golden nematode (G. rostochiensis)||Invertebrate||Not resistant||Castelli 2003|
|Late Blight||Fungus||Resistant||Gonzales 2002|
|Potato Cyst Nematode (G. pallida)||Invertebrate||Not resistant||Castelli 2003|
|Potato Virus X||Virus||Resistant||Horvath 1989|
|Potato Virus Y||Virus||Not resistant||Cai 2011|
|Soft rot (P. carotovorum)||Bacteria||Somewhat resistant||Chung 2011|
I have found no published information about glycoalkaloids in this species. I have tasted the tubers of some seedlings and found them slightly bitter, probably an indication that they are not safe to eat in large amounts.
I have found seeds of this species slow and difficult to germinate using the standard conditions for S. tuberosum. Overall, I was surprised by how happy and healthy this species seems to be in our climate. Plants grow very large and persist late into the year in excellent condition. In 2018, a plant that was surrounded by other potato species that were infected with late blight showed no symptoms at all. I kept that clone for further investigation and plan to attempt crosses with domesticated diploids.
Towill (1983) found that seeds of this species stored at 1 to 3 degrees C germinated at 70% after 10 years.
Tubers have at least four months of dormancy.
Trapero-Mozos (2018) determined that this species will tolerate a temperature of 40 C after acclimation for a period of time at 25 C.
Crosses with S. tuberosum
I have found that S. violaceimarmoratum crosses easily with diploid S. tuberosum.
Watanabe (1991) found that 2.8% of varieties of this species produced 2n pollen, which would be effectively tetraploid and 4EBN.
|S. violaceimarmoratum||S. tuberosum||None||None||Jackson (1999)|
Crosses with other species
|S. violaceimarmoratum||S. stipuloideum (as S. circaefolium and var. capsibaccatum and var circaefolium)||Low||Very Low||Yes||Ochoa 2004|
|S. stipuloideum (as S. circaefolium and var. capsibaccatum and var circaefolium)||S. violaceimarmoratum||Low||None||Ochoa 2004|
|S. violaceimarmoratum||S. commersonii||No||No||Ochoa 2004|
|S. commersonii||S. violaceimarmoratum||No||No||Ochoa 2004|
|S. violaceaimarmoratum||S. laxissimum||High||High||Yes||Ochoa 2004|
|S. laxissimum||S. violaceaimarmoratum||High||High||Ochoa 2004|
|S. violaceaimarmoratum||S. limbaniense||High||High||Yes||Ochoa 2004|
|S. limbaniense||S. violaceaimarmoratum||High||High||Ochoa 2004|
|S. violaceaimarmoratum||S. rhomboideilanceolatum||High||High||Yes||Ochoa 2004|
|S. rhomboideilanceolatum||S. violaceaimarmoratum||High||High||Ochoa 2004|
|S. violaceaimarmoratum||S. chomatophilum||No||No||Ochoa 2004|
|S. chomatophilum||S. violaceaimarmoratum||No||No||Ochoa 2004|
|S. violaceaimarmoratum||S. humectophilum||None||None||Ochoa 2004|
|S. humectophilum||S. violaceaimarmoratum||Low||Low||Ochoa 2004|