''Arnaldoa'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of flowering plants in the aster family,

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

. It is native to

Ecuador Ecuador ( ; ; Quechua: ''Ikwayur''; Shuar: ''Ecuador'' or ''Ekuatur''), officially the Republic of Ecuador ( es, República del Ecuador, which literally translates as "Republic of the Equator"; Quechua: ''Ikwadur Ripuwlika''; Shuar: ''Eku ...

and

Peru , image_flag = Flag of Peru.svg , image_coat = Escudo nacional del Perú.svg , other_symbol = Great Seal of the State , other_symbol_type = Seal (emblem), National seal , national_motto = "Fi ...

.Ulloa, C. U., et al. (2002)
''Arnaldoa argentea'' (Barnadesioideae: Asteraceae), a new species and a new generic record for Ecuador.
''Novon'' 12 415-419. These plants are

shrub A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees ...

s with spines located at the attachment point of each leaf to the stem. The

flower heads A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...

contain disc florets in shades of orange, orange-red, purple, or cream. The plants grow on dry, wooded or shrubby slopes at elevations between 1370 and 3000 metres. ; SpeciesFlann, C (ed) 2009+ Global Compositae Checklist
/ref> * '' Arnaldoa argentea'' C.Ulloa, P.Jørg. & M.O.Dillon – up to 3.5 meters tall with light orange or cream-colored florets (Ecuador) * '' Arnaldoa coccinosantha'' (Muschl.) Ferreyra - Peru * '' Arnaldoa macbrideana'' Ferreyra – purple florets (Peru) * '' Arnaldoa weberbaueri'' (Muschl.) Ferreyra – bright orange-red or occasionally purple florets up to 5 centimeters long (Peru)

References

Asteraceae genera Barnadesioideae Flora of South America Taxa named by Ángel Lulio Cabrera {{Asteraceae-stub