Solanum acaule

OVCHINNIKOVA, ANNA, KRYLOVA, EKATERINA, GAVRILENKO, TATJANA, SMEKALOVA, TAMARA, ZHUK, MIKHAIL, KNAPP, SANDRA & SPOONER, DAVID M., 2011, Taxonomy of cultivated potatoes (Solanum section Petota: Solanaceae), Botanical Journal of the Linnean Society 165 (2), pp. 107-155 : 114

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

Figures

Figure 1. Lectotype specimen of Solanum ajanhuiri Juz. & Bukasov held in WIR (note spelling of specific epithet on this sheet, see text). Reproduced with permission of the N. I. Vavilov Institute of Plant Industry.

Figure 2. Lectotype specimen of Solanum curtilobum Juz. & Bukasov held in LE. Reproduced with permission of the V. L. Komarov Botanical Institute.

Figure 3. Lectotype specimen of Solanum juzepczukii Bukasov held in WIR (WIR-36897). Reproduced with permission of the N. I. Vavilov Institute of Plant Industry.

Figure 4. Lectotype specimen of Solanum tuberosum L. (Chilotanum group) held in LINN (LINN 248.12). Reproduced with permission of the Linnean Society of London.

Figure 5. Lectotype specimen of Solanum andigenum Juz. & Bukasov (Solanum tuberosum L. Andigenum group) held in LE. Reproduced with permission of the V. L. Komarov Botanical Institute.