Origin and scope of the compilation

A copy of the page “Kaktusy mrozoodporne” survives in Konrad Szychowski's private archive of materials. The document was saved in November 2010. The page's publication date and the author of the account remain unidentified. The copy contains a description of overwintering under cover, a list of plants in the collection and an extensive temperature list for cacti and other succulents. The old address digilander.iol.it/cacti/tempA.htm was given with the compilation. [Anonim b.d.q]

The list includes 954 entries. Values were retained as in the copy, including ranges given collectively for genera. For individual entries, the source leaves plant provenance, exposure duration, hydration, temperature measurement method and damage-assessment criterion unspecified. The data present a historical cultivation compilation. Controlled studies with descriptions of material and methods are discussed in the physiology of cactus frost hardiness. [Anonim b.d.q]

Plants listed in the archived collection

The author of the old page listed 16 entries from their own collection. Grafting was noted for two plants identified as Navajoa, and one Echinocereus triglochidiatus retained the number DJF 1145. The following list reproduces the scope of those identifications. [Anonim b.d.q]

Echinocereus coccineus v. guerneyi

Echinocereus polyacanthus

Echinocereus triglochidiatus

Echinocereus triglochidiatus DJF 1145

Pelecyphora vivipara (in the archive: Escobaria vivipara)

Escobaria vivipara v. aggregata

Pelecyphora vivipara (in the archive: Escobaria vivipara v. arizonica)

Pelecyphora vivipara (in the archive: Escobaria vivipara v. kaibabensis)

Escobaria vivipara v. missouriensis

Navajoa fickenseinii (grafted)

Navajoa maia (grafted)

Pelecyphora missouriensis (in the archive: Neobesseya missouriensis)

Opuntia fragilis

Opuntia phaeacantha

Opuntia sp. [Argentyna]

Opuntia sp.

An observation over several freezing nights

A separate account described several nights at −4°C, after which the observer noted no adverse effects in the three plants listed. The reported temperature and verbally described duration have been retained. The copy does not specify the observation date, number of plants or how their condition was assessed. [Anonim b.d.q]

Echinocereus tulensis

Echinocereus blanckii

Oreocereus trollii

Temperature list

Main names correspond to accepted atlas names where the historical identification permits an unambiguous link. Archive names remain in parentheses. Other entries retain the source identification. Synonyms refer to the scope of the historical name associated with the recorded temperature. [2-WWW] [27-WWW]

Two entries retain unusual notation from the copy, “10” for Echinocereus berlandieri and the letter “O” for Mammillaria spinosissima ssp. pilcayensis. They appear with the annotation “source record”. [Anonim b.d.q]

Showing 1–60 z 954 results

Acanthocalycium glaucum −4°C

Acanthocalycium spiniflorum (in the archive: Acanthocalycium klimpelianum) −12°C

Acanthocalycium spiniflorum (in the archive: Acanthocalycium peitscherianum) −12°C

Acanthocalycium spiniflorum −5°C

Acanthocalycium thionanthum −8°C

Acanthocalycium spiniflorum (in the archive: Acanthocalycium violaceum) −12°C

Adromischus cooperi −4°C

Adromischus cristatus −4°C

Adromischus festivus −4°C

Adromischus juttae −4°C

Adromischus poellnitzianus −4°C

Aeonium castello-paivae −2°C

Aeonium holochrysum −5°C

Aeonium spathulatum −10°C

Agave americana −10°C

Agave deserti −10°C

Agave ferdinandi-regis −12°C

Agave ferox −10°C

Agave filifera −12°C

Agave franzosinii −12°C

Agave havardiana −23°C

Agave lechuguilla −12°C

Agave mckelveyana −12°C

Agave mexicana var. macracantha −12°C

Agave neomexicana −12°C

Agave palmeri −12°C

Agave parryi −10°C

Agave parviflora −12°C

Agave picta −7°C

Agave purpusorum −2°C

Agave roezliana −2°C

Agave scabra −7°C

Agave schottii −12°C

Agave striata −7°C

Agave stricta −5°C

Agave toumeyana −12°C

Agave utahensis var. discreta −12°C

Agave utahensis var. eborispina −23°C

Agave utahensis var. kaibabensis −23°C

Agave utahensis var. nevadensis −23°C

Agave utahensis var. utahensis −12°C

Agave victoria-reginae −7°C

Agnirictus agninus −10°C

Aloe ammophila −2°C

Aloe aristata −10°C

Aloe brevifolia −10°C

Aloe carinata −6°C

Aloe globuligemma −2°C

Aloe jucunda −2°C

Aloe laurentiana −10°C

Aloe melanacantha −2°C

Aloe plicatilis −2°C

Aloe rauhii 0°C

Aloe saponaria −7°C

Aloe striata −2°C

Aloe variegata 0°C

Aloinopsis luckhoffii −12°C

Aloinopsis malherbei −12°C

Aloinopsis orpenii −12°C

Aloinopsis peersii −23°C

Basis of the account
Archived materialb.d.q

Mrozoodporne kaktusy i Program ochrony kaktusów

[Autor nieustalony, Mrozoodporne kaktusy i Program ochrony kaktusów, b.d.q]

Older pages on frost-hardy cacti and a plant protection document, preserved in Konrad Szychowski's private materials archive. The “Kaktusy mrozoodporne” copy, saved in November 2010, contains 16 collection entries, an account of several nights at −4°C and 954 temperature-list entries for cacti and other succulents. It gives older plant identifications and threshold values. Measurement methods, exposure duration and injury criteria remain unspecified. The old page's publication date and account authorship are undetermined.

Physiology and anatomy
Bibliographic details and access scope

Data according to the source used. Author unknown. n.d. indicates that the publication date has not been confirmed.

Copy in the supplied material
[2-WWW]Source website

Plants of the World Online — Royal Botanic Gardens, Kew

https://powo.science.kew.org/

Accepted names, synonyms and distribution. A citation beside a taxon leads to its record.

Accessed 2026-10-08.

[27-WWW]Source website

Royal Botanic Gardens, Kew — repozytorium danych

https://sftp.kew.org/

Botanical datasets, including the World Checklist of Vascular Plants, with names, authorships, ranks and synonym relationships.

Accessed 2026-10-11.