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Comments ( anglais )

fourni par eFloras
Differences between Pterocaulon pycnostachyum and P. alopecuroides (Lamarck) de Candolle, which is widespread in the West Indies and South America, are these: plants 50–70 cm high in P. pycnostachyum (versus 70–150 cm in P. alopecuroides), arrays of heads 4–8 cm (versus 3–17 cm) long, involucres 3.5–4 mm (versus 4.5–5 mm) high, and 6–15 (versus 1–3) functionally staminate florets (A. L. Cabrera and A. M. Ragonese 1978). In P. alopecuroides, the arrays of heads are almost always interrupted proximally, commonly producing sessile to subsessile branches. A count of functionally staminate florets provides a clear determinant for plants that might appear ambiguous in other features.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
citation bibliographique
Flora of North America Vol. 19: 476 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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Description ( anglais )

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Plants 2–8 dm. Leaf blades lance-olate to obovate-lanceolate, oblong, or elliptic, 3–11 × 1–3(–3.5) cm, lengths mostly 2–7 times widths, margins usually dentate or denticulate, slightly repand, sometimes nearly entire. Heads in dense, usually contin­uous, rarely interrupted (then near bases), narrow, ± ovoid arrays (2–)3–8(–10) cm (usually single, sometimes with 1–2 basal branches). Involucres campanulate, 4–5 mm. Pistillate florets 23–44. Functionally staminate florets 6–10(–15). Cypselae 1–1.3 mm. 2n = 20.
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cc-by-nc-sa-3.0
droit d’auteur
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
citation bibliographique
Flora of North America Vol. 19: 476 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
rédacteur
Flora of North America Editorial Committee
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eFloras.org
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eFloras

Synonym ( anglais )

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Conyza pycnostachya Michaux, Fl. Bor.-Amer. 2: 126. 1803; Pterocaulon undulatum C. Mohr
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cc-by-nc-sa-3.0
droit d’auteur
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
citation bibliographique
Flora of North America Vol. 19: 476 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
rédacteur
Flora of North America Editorial Committee
projet
eFloras.org
original
visiter la source
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eFloras

Pterocaulon pycnostachyum ( anglais )

fourni par wikipedia EN

Pterocaulon pycnostachyum, with the common names dense-spike blackroot,[3] 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.[4][5]

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.[4][6][7][8][9]

References

  1. ^ Tropicos
  2. ^ The Plant List
  3. ^ USDA, NRCS (n.d.). "Pterocaulon pycnostachyum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 15 October 2015.
  4. ^ a b Flora of North America v 19 p 476.
  5. ^ Discover Life
  6. ^ Cabrera, A. L. and A. M. Ragonese. 1978. Revisión del género Pterocaulon (Compositae). Darwiniana 21: 185–257.
  7. ^ Elliott, Stephen. Sketch of the Botany of South-Carolina and Georgia 2(4): 324. 1824.
  8. ^ Michaux, André. Flora Boreali-Americana 2: 126. 1803.
  9. ^ Southeastern Flora
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Pterocaulon pycnostachyum: Brief Summary ( anglais )

fourni par wikipedia EN

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.

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.

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Pterocaulon pycnostachyum ( vietnamien )

fourni par wikipedia VI
Tango style Wikipedia Icon.svg
Đây là một bài mồ côi vì không có hoặc có ít bài khác liên kết đến nó.
Xin hãy tạo liên kết đến bài này trong các bài của các chủ đề liên quan. (tháng 7 2018)


Pterocaulon pycnostachyum là một loài thực vật có hoa trong họ Cúc. Loài này được (Michx.) Elliott miêu tả khoa học đầu tiên năm 1824.[1]

Chú thích

  1. ^ The Plant List (2010). Pterocaulon pycnostachyum. Truy cập ngày 4 tháng 6 năm 2013.

Liên kết ngoài

 src= Wikimedia Commons có thư viện hình ảnh và phương tiện truyền tải về Pterocaulon pycnostachyum  src= Wikispecies có thông tin sinh học về Pterocaulon pycnostachyum


Bài viết tông cúc Inuleae này vẫn còn sơ khai. Bạn có thể giúp Wikipedia bằng cách mở rộng nội dung để bài được hoàn chỉnh hơn.
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Pterocaulon pycnostachyum: Brief Summary ( vietnamien )

fourni par wikipedia VI


Pterocaulon pycnostachyum là một loài thực vật có hoa trong họ Cúc. Loài này được (Michx.) Elliott miêu tả khoa học đầu tiên năm 1824.

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cc-by-sa-3.0
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wikipedia VI