Taxonomy of cultivated potatoes (Solanum section Petota: Solanaceae) Author OVCHINNIKOVA, ANNA Author KRYLOVA, EKATERINA Author GAVRILENKO, TATJANA Author SMEKALOVA, TAMARA Author ZHUK, MIKHAIL Author KNAPP, SANDRA Author SPOONER, DAVID M. text Botanical Journal of the Linnean Society 2011 2011-01-10 165 2 107 155 http://dx.doi.org/10.1111/j.1095-8339.2010.01107.x journal article 10.1111/j.1095-8339.2010.01107.x 50b4b0e8-e56b-4c22-a9ca-8b5e04e3498d 6326420 KEY TO CULTIVATED POTATO LANDRACES The following key and descriptions, modified from Huamán & Spooner (2002) , highlight typical traits. The qualifier terms ‘mostly’ or ‘usually’ could be employed throughout the key, but are not used for simplicity. 1. Plants semi-rosette to semi-erect; pedicel articulation indistinct to only slightly distinct, located in the upper one-fifth of the pedicel; frost tolerant (of putative hybrid origin with the frost-tolerant species S. acaule or S. megistacrolobum )...............................................................................................................................2 1. Plants ascending to erect; pedicel articulation evident, located below the upper one-fifth of the pedicel; generally not frost tolerant...............................................................................................................................4 2. Most distal lateral leaβets broadly decurrent; plants diploid.........................................1. S. ajanhuiri ( Fig. 1 ) 2. Most distal lateral leaβets not or only slightly decurrent; plants triploid or pentaploid..................................3 3. Plants low growing, 62–98 cm tall; triploid..............................................................3. S. juzepczukii ( Fig. 3 ) 3. Plants of medium height, 96–125 cm tall; pentaploid.................................................2. S. curtilobum ( Fig. 2 ) 4. Plants adapted to short-day βowering and tuberization; upper leaves diverged from stem at 40°–50°; diploid, triploid or tetraploid ................................................................... 4. S. tuberosum Andigenum group ( Fig. 4 ) 4. Plants adapted to long-day βowering and tuberization; upper leaves diverged from stem at angle of 50°–90°...... ..................................................................................................................................................... 5 5. Landrace populations native to south-central Chile ..........................4. S. tuberosum Chilotanum group ( Fig. 5 ) 5. Modern varieties originally derived from breeding populations in the Northern Hemisphere, now grown worldwide; of many complex hybrid origins from the Chilotanum and Andigenum groups and other cultivar groups bred up to the earlier 20th century.............................................................4. S. tuberosum relatively modern varieties