Information:  - Herbaceous plants (in botanical use frequently simply herbs) are plants that have no persistent woody stem above ground. Herbaceous plants may be annuals, biennials or perennials.  - Patagonia is a sparsely populated region located at the southern end of South America, shared by Argentina and Chile. The region comprises the southern section of the Andes mountains as well as the deserts, steppes and grasslands east of this southern portion of the Andes. Patagonia has two coasts; a western one towards the Pacific Ocean and an eastern one towards the Atlantic Ocean.  - Halophytum ameghinoi is a species of herbaceous plant endemic to Patagonia . It is a succulent annual plant , with simple , fleshy , alternate leaves . The plants are monoecious , with solitary female flowers and inflorescences of male flowers on the same plant . Halophytum has sometimes been placed in its own family , Halophytaceae . For instance , the 2009 APG III system and the 2003 APG II system recognise the family and assign it to the order Caryophyllales in the clade core eudicots , although the 1998 APG system did not recognise such a family , placing its members in the family Chenopodiaceae instead .  - A flower, sometimes known as a bloom or blossom, is the reproductive structure found in plants that are floral (plants of the division Magnoliophyta, also called angiosperms). The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs. Flowers may facilitate outcrossing (fusion of sperm and eggs from different individuals in a population) or allow selfing (fusion of sperm and egg from the same flower). Some flowers produce diaspores without fertilization (parthenocarpy). Flowers contain sporangia and are the site where gametophytes develop. Many flowers have evolved to be attractive to animals, so as to cause them to be vectors for the transfer of pollen. After fertilization, the ovary of the flower develops into fruit containing seeds.  - Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae.  - In botany, blossoms are the flowers of stone fruit trees (genus "Prunus") and of some other plants with a similar appearance that flower profusely for a period of time in spring.    Given the paragraphs above, decide what entity has the relation 'taxon rank' with 'genus'.
The answer to this question is:
halophytum