The species in a changing generic treatment
Eriosyce subgibbosa is accepted by POWO and belongs to the lineage traditionally called Neoporteria. Earlier broad treatments included taxa now recognized separately. The 2019 molecular analysis showed that some such varieties and subspecies have different closest relatives. Earlier research results therefore require linkage to the actual study material [Guerrero et al. 2019] [2-WWW].
Seeds from Punta Lobos
For comparison with E. villosa, seeds were collected from 15 plants at Punta Lobos near Pichilemu. This locality represents wetter, cooler conditions than the northern comparison site. Growth-chamber experiments combined four temperature regimes with five substrate water potentials. Mannitol adjusted the potential, making water uptake more difficult as its concentration increased [Guerrero et al. 2016].
Seeds of E. subgibbosa had a higher overall germination probability. Water availability was important, and performance was highest in the warmer regimes with readily available water. At the most negative potential, −1.5 MPa, neither species germinated. This shows how the onset of growth can limit recruitment even in a genus associated with dry habitats [Guerrero et al. 2016].
Biological meaning of the experiment
The comparison included one population per species, and seed batches had different storage periods. The authors interpret the results in the context of a germination niche extending into wetter habitats. Variation among populations and maternal growing conditions require further assessment. Laboratory treatments describe germination, whereas adult seasonal requirements and frost tolerance require their own evidence [Guerrero et al. 2016].
Related articles
Materials from the author's archive
The species also appears in Konrad Szychowski's private material archive [Schumann 1890] [Kaktologia 2009b] [Neciu n.d.] [Romulski n.d.] [Kaktusy i Inne 2005b].
Synonyms and names in the literature
Echinocactus subgibbosus · Neoporteria subgibbosa · Chilenia subgibbosa · Euporteria subgibbosa · Cactus floribundus · Cereus foveolatus · Cereus hoffmannseggii · Cereus montevidensis · Chilenia acutissima · Chilenia castaneoides · Chilenia heteracantha · Chilenia rostrata · Chilenia subcylindrica · Echinocactus acutissimus · Echinocactus acutissimus var. cristatus · Echinocactus castaneoides · Echinocactus crenatus · Echinocactus exsculptus · Echinocactus exsculptus var. cristatus · Echinocactus exsculptus var. elatior · Echinocactus exsculptus var. foveolatus · Echinocactus exsculptus var. fulvispinus · Echinocactus exsculptus var. tenuispinus · Echinocactus exsculptus var. thrincogonus · Echinocactus foveolatus · Echinocactus gayanus · Echinocactus guyannensis · Echinocactus montevidensis · Echinocactus rostratus · Echinocactus thrincogonos · Echinocactus thrincogonus var. elatior · Echinocactus valparaiso · Euporteria acutissima · Euporteria castaneoides · Euporteria heteracantha · Euporteria subcylindrica · Hildmannia rostrata · Mammillaria floribunda · Mammillaria gibbosa · Neochilenia rostrata · Neoporteria acutissima · Neoporteria castaneoides · Neoporteria exsculpta · Neoporteria heteracantha · Neoporteria litoralis var. intermedia · Neoporteria microsperma · Neoporteria microsperma var. graciana · Neoporteria nigrihorrida var. minor · Neoporteria subcylindrica · Neoporteria subgibbosa f. castaneoides · Neoporteria subgibbosa f. heteracantha · Neoporteria subgibbosa f. microsperma · Neoporteria subgibbosa f. subcylindrica · Neoporteria subgibbosa var. intermedia · Neoporteria subgibbosa var. orientalis · Neoporteria wagenknechtii var. microsperma · Neoporteria wagenknechtii var. napina [2-WWW]
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