Pterocaulon

Pterocaulon is a genus of flowering plants in the sunflower family, native to North and South America and to Australasia.[2][3] Blackroot is a common name for species native to North America.[4]

For the seaweed, see Sargassum.

Pterocaulon
Pterocaulon sphacelatum
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Subfamily:
Asteroideae
Tribe:
Inuleae[1]
Genus:
Pterocaulon

Elliott
Type species
Conyza pycnostachya
(basionym of
Pterocaulon pycnostachyum)
Michx.
Synonyms[1]
  • Monenteles Labill.
  • Chlaenobolus Cass.

The plants are perennial herbs, frequently densely covered with woolly hairs. The generic name means "winged stem," referring to the decurrent leaf bases that give the appearance of wings running down the sides of the stems.[5][6]

Species[1][7][8]
  • Pterocaulon alopecuroides - South America, Puerto Rico, Virgin Islands
  • Pterocaulon angustifolium - Brazil, Argentina, Paraguay, Uruguay
  • Pterocaulon balansae - Brazil, Argentina, Paraguay, Uruguay
  • Pterocaulon cordobense - Brazil, Argentina, Paraguay, Uruguay
  • Pterocaulon globuliflorus - Western Australia, Northern Territory
  • Pterocaulon lanatum - Brazil, Bolivia, Paraguay, Salta
  • Pterocaulon lorentzii - Brazil, Argentina, Paraguay, Uruguay, Bolivia
  • Pterocaulon niveum - Western Australia, Northern Territory
  • Pterocaulon polypterum - Brazil, Argentina, Uruguay
  • Pterocaulon polystachyum - Brazil, Argentina, Paraguay, Uruguay
  • Pterocaulon purpurascens - Mato Grosso, Argentina, Paraguay, Bolivia
  • Pterocaulon pycnostachyum - United States (AL GA FL SC NC)
  • Pterocaulon redolens - Indochina, Hainan, Orissa, Philippines, Maluku, New Guinea, eastern Australia
  • Pterocaulon rugosum - Brazil, Argentina, Paraguay
  • Pterocaulon serrulatum - Western Australia, Northern Territory, South Australia
  • Pterocaulon sphacelatum - Australia
  • Pterocaulon sphaeranthoides - Western Australia, Northern Territory, Queensland
  • Pterocaulon spicatum - South America
  • Pterocaulon verbascifolium - Western Australia, Northern Territory, Queensland
  • Pterocaulon virgatum - Central + South America, West Indies, United States (TX LA)

References
  1. Flann, C (ed) 2009+ Global Compositae Checklist Archived 2014-11-30 at Archive.today
  2. Elliott, Stephen. Sketch of the Botany of South-Carolina and Georgia 2(4): 323–324. 1824 short descriptions in parallel English and Latin, longer descriptions in English
  3. Tropicos, Pterocaulon Elliott
  4. "Pterocaulon". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 15 October 2015.
  5. Flora of North America v 21 p 476, Pterocaulon Elliott
  6. Cabrera, A. L. and A. M. Ragonese. 1978. Revisión del género Pterocaulon (Compositae). Darwiniana 21: 185–257.
  7. The Plant List search for Pterocaulon
  8. Biota of North America Program 2013 county distribution maps


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