Pterocaulon virgatum

Pterocaulon virgatum, common name wand blackroot,[3] is a plant species widespread in Latin America and in the West Indies. In the contiguous United States, it has been reported only from Texas and Louisiana.[4][5] It grows in marshy areas, ditches, sandy loam, etc.[6][7]

Pterocaulon virgatum
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Subfamily:
Asteroideae
Tribe:
Plucheeae
Genus:
Pterocaulon
Species:
P. virgatum
Binomial name
Pterocaulon virgatum
(L.) DC.
Synonyms[1][2]
  • Baccharis virgata DC.
  • Chlaenobolus virgata (L.) Cass.
  • Conyza alopecuroides Lam.
  • Conyza polystachya Michx.
  • Conyza rugosa Vahl
  • Conyza virgata (L.) L.
  • Conyza virgata DC. (illegitimate)
  • Gnaphalium decurrens Schrank
  • Gnaphalium spicatum Mill.
  • Gnaphalium undulatum L.
  • Gnaphalium virgatum L.
  • Pterocaulon alopecuroides (Lam.) DC.
  • Pterocaulon pilcomayense Malme
  • Pterocaulon pompilianum Standl. & L.O.Williams
  • Pterocaulon subspicatum Malme ex Chodat
  • Pterocaulon subvirgatum Malme
  • Pterocaulon undulatum C. Mohr
  • Pterocaulon virgatum fo. alopecuroides (Lam.) Arechav.
  • Pterocaulon virgatum f. subvirgata (Malme) Arechav.

Pterocaulon virgatum is a perennial herb up to 150 cm (60 inches) tall. Leaves are alternate, narrowly linear, green above, white with dense woolly hairs below. Flower heads are arranged in spikes at the ends of branches. There are no ray flowers, only 25-50 yellow disc flowers per head.[6][8]

References
  1. Tropicos
  2. The Plant List
  3. "Pterocaulon virgatum". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 15 October 2015.
  4. Louisiana Department of Wildlife and Fisheries
  5. Texas A&M University, Oak Trust, Department of Biology
  6. Flora of North America v 19 p 477.
  7. Cabrera, A. L. and A. M. Ragonese. 1978. Revisión del género Pterocaulon (Compositae). Darwiniana 21: 185–257.
  8. Candolle, Augustin Pyramus de. Prodromus Systematis Naturalis Regni Vegetabilis 5: 454. 1836.
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