Helmut E. Walter

Floral biology of Echinopsis chiloensis ssp. chiloensis (Cactaceae): Evidence for a mixed pollination syndrome

Helmut E. Walter · Flora · 2010 · 48 citations

Biology, Plant Biology, Mixed Pollination Syndrome +10

Phylogenetics and predictive distribution modeling provide insights into the geographic divergence of Eriosyce subgen. Neoporteria (Cactaceae)

Pablo C. Guerrero, Mary T. K. Arroyo, Ramiro O. Bustamante et al. · Plant Systematics and Evolution · 2011 · 30 citations · Full text

Biology, Biodiversity, Phylogenetics +11

Molecular phylogeny of the large South American genus <i>Eriosyce</i> (Notocacteae, Cactaceae): Generic delimitation and proposed changes in infrageneric and species ranks

Pablo C. Guerrero, Helmut E. Walter, Mary T. K. Arroyo et al. · Taxon · 2019 · 19 citations

Botany, Genetics, Taxonomy +20

Floral biology, phytogeography and systematics of <i>Eriosyce</i> subgenus <i>Neoporteria</i> (Cactaceae)

Helmut E. Walter · Bradleya · 2008 · 13 citations

Biology, Neoporteria Br, Morphological Evidence +15

Evolutionary trends in the columnar cactus genus <i>Eulychnia</i> (Cactaceae) based on molecular phylogenetics, morphology, distribution, and habitat

Isabel Larridon, Helmut E. Walter, Marcelo Rosas et al. · Systematics and Biodiversity · 2018 · 10 citations