Arrojadoa rhodantha (G├╝rke) Britton & Rose

Shrub to 2 m tall, sometimes scrambling. Ribs 10-13. Areoles mostly less than 1 cm apart, central spines 5-6 becoming white, radial spines about 20. Flowers with perianth segments spreading at the tip, brilliant pink. Fruit pinkish.

E Brazil

 

A. penicillata (Gürke) Britton & Rose from E Brazil is occasionally grown and differs from the above species most clearly in having narrower stems mostly less than 1.5 cm wide.

Source: Thompson, A, ; Forbes, S.; Spencer, R. (1997). Cactaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Cactaceae
genus        Arrojadoa Britton & Rose