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Solanum guerreroense

Common Name(s)    
Code grr
Clade Mixed
Series Demissa
Ploidy Hexaploid (6x)
Self-compatible Yes
Cytoplasm Type D (Hosaka 2014)


Solanum guerreroense (guerreroense meaning “from Guerrero”) is a species of very limited distribution in Guerrero, Mexico, where it grows in conifer and oak forests.  It is only known from a single collection and expeditions since have failed to locate any plants (Spooner 2004).  It may be synonymous with S. iopetalum (Marks 1965).  Plants are low growing and can reach about nine inches tall.  Violet flowers (although I have seen white with only a hint of purple).  Tubers to about two inches, russet to purplish (Correll 1962).

Morphologically, this plant fits with a number of geographically separate rosette forming species, including South American species like S. acaule and S. albicans and North American species like S. demissum.

Condition Level of Resistance Source
Potato Spindle Tuber Viroid Somewhat Resistant Machida-Hirano 2015
Potato Virus X Somewhat Resistant Turuleva 1990
Potato Virus Y Somewhat Resistant Turuleva 1990

Glykoalkaloid content




I have found this species easy to germinate, taking about the same amount of time as S. tuberosum.

Hawkes (1956) reported that, although this species is self-fertile, it requires hand pollination in order to set seed.  I have not observed this to be true.  Plants grown here easily set selfed berries with no intervention.  Berries grown at or near ground level and sometimes grow down into the soil as they enlarge.  This makes them particularly vulnerable to slug damage.


This species appears to be essentially cleistogamous, self-fertilizing as soon as the flowers open or possibly even earlier.  Under our conditions, every flower forms a berry.

Crosses with S. tuberosum

Watanabe (1991) found that 100% (of only two plants) of varieties of this species produced 2n pollen.

Female Male Berry Set Seed Set Germination Ploidy Source
S. tuberosum S. guererroense Minimal None     Jackson (1999)
S. guererroense S. tuberosum Low Moderate     Jackson (1999)
S. guerreroense S. tuberosum (cv. Superb) Yes Yes     Carlson-Nilsson (2010)
S. guerreroense S. tuberosum subsp. andigenum Yes Yes     Carlson-Nilsson (2010)

Crosses with other species

In crosses between the Mexican hexaploid species, Hawkes (1956) found that only the progeny of the S. guerreroense x S. iopetallum cross set seed successfully.

Female Male Berry Set Seed Set Germination Ploidy Source
S. guerreroense S. iopetallum (as S. brachycarpum) Low Low High Hexaploid Hawkes (1956)
S. guerreroense S. demissum Yes Yes     Hawkes (1956)
S. demissum S. guerreroense Yes Yes     Hawkes (1956)
S. guerreroense S. hougasii (as S. spectabile) Yes Yes High Hexaploid Hawkes (1956)



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