Pterocaulon pycnostachyum
{{Short description|Species of plant}}
{{Speciesbox
|image = Pterocaulon pycnostachyum mosbo6.jpg
|genus = Pterocaulon
|species = pycnostachyum
| status = G5
| status_system = TNC
|authority = (Michx.) Elliott
|synonyms = *Chlaenobolus pycnostachyum (Michx.) Cass.
- Chlaenobolus spicatus Cass.
- Conyza pycnostachya Michx.
- Gnaphalium undulatum Walter
- Pterocaulon undulatum C. Mohr
|synonyms_ref = [http://tropicos.info/Name/2726386?tab=synonyms Tropicos][http://www.theplantlist.org/tpl1.1/record/gcc-23334 The Plant List]
}}
Pterocaulon pycnostachyum, with the common names dense-spike blackroot,{{PLANTS|id=PTPY2|taxon=Pterocaulon pycnostachyum|accessdate=15 October 2015}} fox-tail blackroot or coastal blackroot, is a flowering plant species native to the U.S. southeast coastal plain in the states of Alabama, Mississippi, North Carolina, Florida, Georgia, and South Carolina. It can be found in pinelands, ditches, depressions, and fields.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=220011207 Flora of North America v 19 p 476].[http://www.discoverlife.org/mp/20q?search=Pterocaulon+pycnostachyum Discover Life]
Description
Pterocaulon pycnostachyum is a perennial herb up to 80 cm (31 inches) tall. Stems and the underside of leaves are covered with a thick, white layer of woolly hairs. Flower heads are crowded into a densely packed spike at the tips of the branches. Each head has as many as 50 small yellowish flowers. The plant is monoecious, meaning that some of the flowers have male stamens, while female pistils are in separate flowers in the same head.Cabrera, A. L. and A. M. Ragonese. 1978. Revisión del género Pterocaulon (Compositae). Darwiniana 21: 185–257.Elliott, Stephen. Sketch of the Botany of South-Carolina and Georgia 2(4): 324. 1824.Michaux, André. Flora Boreali-Americana 2: 126. 1803.[http://www.southeasternflora.com/view_flora.asp?plantid=1478 Southeastern Flora]
References
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{{Taxonbar|from=Q15600209}}
Category:Flora of the Southeastern United States
Category:Taxa named by André Michaux
Category:Plants described in 1803
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