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Pterocaulon pycnostachyum : ウィキペディア英語版 | Pterocaulon pycnostachyum
''Pterocaulon pycnostachyum,'' with the common names dense-spike blackroot, fox-tail blackroot or coastal blackroot, is a plant species native to Alabama, Mississippi, North Carolina, Florida, Georgia, and South Carolina. It can be found in pinelands, ditches, depressions, and fields.〔(Flora of North America v 19 p 476 ).〕〔(Discover Life )〕 ''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.〕〔(Southeastern Flora )〕 ==References==
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