Arnaldoa

Arnaldoa
Arnaldoa macbrideana
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Subfamily:	Barnadesioideae
Tribe:	Barnadesieae
Genus:	Arnaldoa Cabrera
Type species
Arnaldoa magnifica (syn of A. weberbaueri) Cabrera

Arnaldoa is a genus of flowering plants in the aster family, Asteraceae. It is native to Ecuador and Peru.[1][2]

These plants are shrubs with spines located at the attachment point of each leaf to the stem. The flower heads contain disc florets in shades of orange, orange-red, purple, or cream and the pappus-tufted fruits are adapted for wind dispersal. The plants grow on dry, wooded or shrubby slopes at elevations between 1370 and 3000 metres.[1]

Species[3]

• 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

• 
  Detail of woody stem of A. macbrideana, showing paired spines
• 
  Flowering shoot of
  A. macbrideana in bud, Dresden Botanical Garden
• 
  Flowering growth of A. macbrideana, showing bud and infructescences, that on left still enclosing pappus-tufted fruits

References

1. Ulloa, C. U., et al. (2002). Arnaldoa argentea (Barnadesioideae: Asteraceae), a new species and a new generic record for Ecuador. Novon 12 415-419.
2. Tropicos, Arnaldoa Cabrera
3. Flann, C (ed) 2009+ Global Compositae Checklist