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Helianthus atrorubens and H. silphioides form a morphologically similar pair of species that share the distinctive feature of relatively broad, tightly appressed phyllaries with apices obtuse to acute. Helianthus atrorubens has a more easterly geographic distribution along the Piedmont and the Atlantic coastal plain and the southern Appalachian Mountains; distribution of H. silphioides is centered in the Ozark region. In general, H. silphioides differs in its usually well developed cauline leaves, and basal leaves with winged petioles that are less than half the total lengths. Involucres with phyllaries tightly appressed are also observed in H. occidentalis and H. pauciflorus subsp. pauciflorus, which differs in having the phyllary apices acute to acuminate as well as in usually having abaxial faces of leaves and ray laminae densely gland-dotted.
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Description
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Perennials, 50–200 cm (with crown buds; nonflowering stems usually absent). Stems erect, proximally villous to strigoso-hispid, distally hispid or glabrate. Leaves mostly basal; opposite; petioles 4–25 cm (usually winged at least 1/2 their lengths); blades lanceolate to ovate, 7–26 × 3–10 cm, bases broadly cuneate to nearly truncate (often decurrent onto petioles), margins serrate to crenate, abaxial faces strigoso-hispid (hairs of midribs1+ mm), not gland-dotted (cauline to 8 pairs proximal to heads, ovate to elliptic, smaller). Heads (1–)3–15+. Peduncles 0.3–17 cm. Involucres broadly hemispheric, 9–16 mm diam. Phyllaries 15–22, broadly ovate to oblong, 7–9 × 4–5 mm, (margins ciliolate) apices obtuse to acute, sometimes mucronate, abaxial faces usually glabrous. Paleae 4–5.5 mm, ± 3-toothed to entire. Ray florets 10–15; laminae 15–22 mm (abaxial faces not gland-dotted). Disc florets 75+; corollas 4–6 mm, lobes reddish; anthers dark, appendages dark (style branches yellow ). Cypselae 2.8–3 mm, glabrous or distally puberulent; pappi of 2 aristate scales 2.5–2.8 mm. 2n = 34.
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Synonym
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Helianthus atrorubens var. alsodes Fernald; H. sparsifolius Elliott
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Helianthus atrorubens
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Helianthus atrorubens is a North American species of sunflower known by the common name purpledisc sunflower. It is native to the southeastern United States. It is found in all the coastal states from Louisiana to Virginia, plus the inland states of Kentucky and Tennessee.[2]
Helianthus atrorubens is a perennial herb sometimes as much as 200 cm (80 inches) tall. Most of the leaves are close to the base of the stem. One plant can produce 1-15 flower heads, each with 10-15 yellow ray florets surrounding 75 or more red or purple disc florets. The plant grows in mixed woods and along roadsides.[3]
References
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Helianthus atrorubens: Brief Summary
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Helianthus atrorubens is a North American species of sunflower known by the common name purpledisc sunflower. It is native to the southeastern United States. It is found in all the coastal states from Louisiana to Virginia, plus the inland states of Kentucky and Tennessee.
Helianthus atrorubens is a perennial herb sometimes as much as 200 cm (80 inches) tall. Most of the leaves are close to the base of the stem. One plant can produce 1-15 flower heads, each with 10-15 yellow ray florets surrounding 75 or more red or purple disc florets. The plant grows in mixed woods and along roadsides.
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Helianthus atrorubens
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Fransızca
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Helianthus atrorubens est une espèce nord-américaine de tournesol connue sous le nom commun de tournesol Purpledisc. L'espèce est originaire du sud-est des États-Unis et se rencontre dans tous les États côtiers, de la Louisiane à la Virginie, ainsi que dans les États intérieurs du Kentucky et du Tennessee.
Helianthus atrorubens est une plante herbacée vivace atteignant jusqu'à 200 cm de hauteur. La plupart des feuilles sont proches de la base de la tige. Une plante peut produire de 1 à 15 capitules. La plante pousse dans les forêts mixtes et le long des routes.
Liste des sous-espèces et variétés
Selon The Plant List (22 mai 2018)[1] :
- sous-espèce Helianthus atrorubens subsp. radula (Pursh) Anashch.
Selon Tropicos (22 mai 2018)[3] (Attention liste brute contenant possiblement des synonymes) :
- sous-espèce Helianthus atrorubens subsp. atrorubens
- variété Helianthus atrorubens var. alsodes Fernald
- variété Helianthus atrorubens var. atrorubens
- variété Helianthus atrorubens var. pubescens Kuntze
Notes et références
Références taxinomiques
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Helianthus atrorubens: Brief Summary
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Fransızca
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wikipedia FR tarafından sağlandı
Helianthus atrorubens est une espèce nord-américaine de tournesol connue sous le nom commun de tournesol Purpledisc. L'espèce est originaire du sud-est des États-Unis et se rencontre dans tous les États côtiers, de la Louisiane à la Virginie, ainsi que dans les États intérieurs du Kentucky et du Tennessee.
Helianthus atrorubens est une plante herbacée vivace atteignant jusqu'à 200 cm de hauteur. La plupart des feuilles sont proches de la base de la tige. Une plante peut produire de 1 à 15 capitules. La plante pousse dans les forêts mixtes et le long des routes.
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Helianthus atrorubens
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Vietnamca
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Helianthus atrorubens: Brief Summary
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Vietnamca
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wikipedia VI tarafından sağlandı
Helianthus atrorubens là một loài thực vật có hoa trong họ Cúc. Loài này được L. mô tả khoa học đầu tiên năm 1753.
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