''Arnaldoa'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of flowering plants in the aster family,

Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...

. It is native to

Ecuador Ecuador, officially the Republic of Ecuador, is a country in northwestern South America, bordered by Colombia on the north, Peru on the east and south, and the Pacific Ocean on the west. It also includes the Galápagos Province which contain ...

and

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

.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 or 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 by their multiple ...

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

flower heads A pseudanthium (; : pseudanthia) 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, composite flowers ...

contain disc florets in shades of orange, orange-red, purple, or cream and the pappus-tufted fruits are adapted for

wind dispersal Biological dispersal refers to both the movement of individuals (animals, plants, fungi, bacteria, etc.) from their birth site to their breeding site ('natal dispersal') and the movement from one breeding site to another ('breeding dispersal' ...

. 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)

Gallery

File:Arnaldoa macbrideana 04.jpg, Detail of woody stem of ''A. macbrideana'', showing paired spines File:Arnaldoa macbrideana.jpg, Flowering shoot of
''A. macbrideana'' in bud,

Dresden Botanical Garden The ''Botanischer Garten der Technischen Universität Dresden'' (3.25 hectares), also known as the ''Botanischer Garten Dresden'' or Dresden Botanical Garden, is a botanical garden maintained by the Dresden University of Technology. It is loca ...

File:Arnaldoa macbrideana3.jpg, Flowering growth of ''A. macbrideana'', showing bud and infructescences, that on left still enclosing pappus-tufted fruits

References

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