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Pterocaulon virgatum : ウィキペディア英語版 | Pterocaulon virgatum
''Pterocaulon virgatum,'' common name wand blackroot, 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.〔(Louisiana Department of Wildlife and Fisheries )〕〔(Texas A&M University, Oak Trust, Department of Biology )〕 It grows in marshy areas, ditches, sandy loam, etc.〔(Flora of North America v 19 p 477 ).〕〔Cabrera, A. L. and A. M. Ragonese. 1978. Revisión del género Pterocaulon (Compositae). Darwiniana 21: 185–257.〕 ''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.〔〔Candolle, Augustin Pyramus de. Prodromus Systematis Naturalis Regni Vegetabilis 5: 454. 1836.〕 ==References==
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