Eberhard Lutz
Gedanke zu einer Neuordnong der nordamerikanischen Escobarien in den USA und Kanada
- das Ergebnis aus 20 Jahren Feldarbeit, Mitteilungsblatt des Arbeitskreises für Mammillarienfreunde,
34(1, 2): 18-41, 80-84, 2010
E. Lutz resumes his observations and experiences of more than 20 years of intense field research
on plants of the genus Escobaria and presents his own classification of the genus.
In his article he discusses only taxa growing in the USA and Canada.
Genus Escobaria
1. Escobaria vivipara Group |
|
Escobaria vivipara var. vivipara | |
  | |
Escobaria vivipara var. vivipara f. radiosa | |
Synonym:   | Escobaria vivipara var. radiosa |
Notes:   | E. Lutz holds the taxon Escobaria vivipara var. radiosa to be only a habitat form of E. vivipara var. vivipara. |
Escobaria vivipara var. arizonica | |
Notes:   | The biggest representative of E. vivipara, specification of individual taxa among E. vivipara var. rosea, E. vivipara var. kaibabensis and E. vivipara var. bisbeeana is not easy. |
Escobaria vivipara var. arizonica f. kaibabensis | |
Synonym:   | Escobaria vivipara var. kaibabensis |
Notes:   | Major differences between juvenille and mature plants. Spines of mature plants is identical with spines of E. vivipara var. arizonica. |
Escobaria vivipara var. rosea | |
Escobaria vivipara var. neomexicana | |
Escobaria vivipara var. bisbeeana | |
2. The Western Group of Escobaria |
|
Escobaria alversonii | |
Escobaria deserti | |
Escobaria buoflama | |
Notes:   | The taxon has got similar features as E. alversonii and E. deserti. |
3. Escobaria missouriensis Group |
|
Escobaria missouriensis | |
Escobaria missouriensis f. marstonii | |
Escobaria missouriensis f. robustior | |
Escobaria missouriensis f. navajoensis | |
4. Escobarias at the Tularosa Basin |
|
Escobaria organensis | |
Escobaria organensis var. sandbergii | |
Synonym:   | Escobaria sandbergii |
Notes:   | Identical appearance as E. organensis, only juvenille plants are different - lighter, almost white spines. Affinity and resemblance with E. albicolumnaria has not yet been studied. |
Escobaria villardii | |
5. Escobaria orcuttii Group |
|
Escobaria orcuttii | |
Escobaria orcuttii f. koenigii | |
Synonym:   | Escobaria orcuttii var. koenigii |
Notes:   | Based on the evolution of all the three taxa (orcuttii, koenigii, macraxina) within the collection it is only the E. orcuttii form. |
Escobaria orcuttii f. macraxina | |
Synonym:   | Escobaria orcuttii var. macraxina |
Notes:   | Based on the evolution of all the three taxa (orcuttii, koenigii, macraxina) within the collection it is only the E. orcuttii form. |
6. Escobaria dasyacantha Group |
|
Escobaria dasyacantha | |
Escobaria dasyacantha f. chaffeyi | |
Synonym:   | Escobaria chaffeyi |
Notes:   | Minimal differences between E. dasyacantha and E. chaffeyi are probably caused by their appearance in various altitudes and these are wiped when planted in a collection. Flowers and seeds do not show any differences. |
Escobaria guadalupensis | |
Notes:   | Based on its similar appearance to E. dasyacantha the taxon is regarded as its relative. |
7. Escobaria duncanii Group |
|
Escobaria duncanii | |
Escobaria albicolumnaria | |
8. Escobaria sneedii Group |
|
For now this group has not been studied more closely. | |
9. Group of Various Taxa |
|
It is a group comprising species which cannot be assigned to any of the mentioned groups. | |
Escobaria strobiliformis | |
Escobaria runyonii | |
Synonym:   | Coryphantha robertii |
Escobaria minima | |
Escobaria hesteri | |
Escobaria robbinsorum | |
10. Group of uncertain Taxa |
|
Escobaria dasyacantha var. varicolor | |
Notes:   | Lz 077 - probably E. strobiliformis |
Escobaria borealis | |
Notes:   | Based on a careful observation the Lz 150 from Nutria Lake, NM is assigned by the author to E. vivipara var. arizonica. |
Escobaria fragrans | |
Notes:   | Fragant flowers being the only difference from E. vivipara var. vivipara f. radiosa cannot be considered as a sufficient reason to the assignment of the variety status. It is the reason why the taxon is being assigned to E. vivipara var. vivipara f. radiosa. |
Escobaria bella | |
Notes:   | A plant described by Britton and Rose has not been discovered anymore since 1914. Mentioned type locality, located close to the collection Lz 700 (Del Rio, Tx.), suggests that it could be E. runyonii. Nevertheless, also some of the Coryphantha genus, cornifera group could be considered. |
Last modified February 25, 2011
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