Cylindropuntia ramosissima

Segmented architecture and name

Thin cylindrical segments form a highly branched shrub. The former combination Opuntia ramosissima and the name O. tesselata occur in the synonymy of accepted Cylindropuntia ramosissima. Phylogenetic data distinguish a Ramosissimae lineage within the genus, reflecting the evolutionary distinctness of this architectural form. [Bárcenas 2016] [Majure et al. 2019] [2-WWW]

Comparison with nectar-secreting chollas

In Mojave studies, the species was treated as a plant lacking extrafloral nectaries and compared with C. echinocarpa and C. acanthocarpa. Fewer ants were observed on it. The comparison indicates an association between nectar availability and insect activity on a cactus within a specific local species community. [Braun and Lortie 2025]

Endophytes in tissues

In the 2005 study, C. ramosissima provided the most isolates among 21 cactus taxa examined, 114 cultures from 50 tissue fragments. Several fungi could grow from one fragment. Culture number describes isolation frequency and co-occurrence in a sample, while diversity also depends on taxon number and their proportions. [Suryanarayanan et al. 2005]

Material was sampled from shallow stem parts including internal tissue, then disinfected and placed on medium. This method reveals fungi capable of growth under experimental conditions. Endophyte co-occurrence in symptomless tissues is a starting point for studying their physiological and ecological functions. [Suryanarayanan et al. 2005]

Reproduction in the genetic comparison

In the 2025 analysis, C. ramosissima represented a diploid taxon with bisexual flowers. SNP markers were compared with five other species encompassing clonality, different sexual systems and polyploidy. Conclusions concern one population per species and require consideration of their different demographic histories. [Ramadoss et al. 2025]