Difference between revisions of "Helianthus petiolaris"
J. Acad. Nat. Sci. Philadelphia 2: 115. 1821.
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|discussion=<p>Subspecies 2 (2 in the flora).</p><!-- | |discussion=<p>Subspecies 2 (2 in the flora).</p><!-- | ||
--><p><i>Helianthus petiolaris</i> is adventive beyond western North America.</p><!-- | --><p><i>Helianthus petiolaris</i> is adventive beyond western North America.</p><!-- | ||
| − | --><p>A third subspecies has yet to be named at that rank in <i>Helianthus petiolaris</i>; it has been called <i>H. petiolaris</i> <i></i>var.<i> canescens</i> A. Gray. It differs in having stems, leaves, and phyllaries densely canescent and abaxial faces of leaves densely gland-dotted. It is additionally characterized by peduncles usually ebracteate, phyllaries 1–2 mm wide, disc corolla throats gradually narrowed distal to slight, not densely hairy basal bulges, and 2n = 34. It flowers late spring through late summer and grows on sandy soils in open areas at (10–)1000–2300 m in Arizona, California, <i>Nevada</i>, New Mexico, and Texas and in Mexico. It was treated as <i>H. niveus</i> (Bentham) Brandegee <i></i>subsp.<i> canescens</i> (A. Gray) Heiser by C. B. Heiser et al. (1969); molecular and morphologic data appear to favor a placement within <i>H. petiolaris</i>.</p> | + | --><p>A third subspecies has yet to be named at that rank in <i>Helianthus petiolaris</i>; it has been called <i>H. petiolaris</i> <i></i></i>var.<i><i> canescens</i> A. Gray. It differs in having stems, leaves, and phyllaries densely canescent and abaxial faces of leaves densely gland-dotted. It is additionally characterized by peduncles usually ebracteate, phyllaries 1–2 mm wide, disc corolla throats gradually narrowed distal to slight, not densely hairy basal bulges, and 2n = 34. It flowers late spring through late summer and grows on sandy soils in open areas at (10–)1000–2300 m in Arizona, California, <i>Nevada</i>, New Mexico, and Texas and in Mexico. It was treated as <i>H. niveus</i> (Bentham) Brandegee <i></i></i>subsp.<i><i> canescens</i> (A. Gray) Heiser by C. B. Heiser et al. (1969); molecular and morphologic data appear to favor a placement within <i>H. petiolaris</i>.</p> |
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|publication year=1821 | |publication year=1821 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_359.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Helianthinae | ||
Revision as of 18:48, 24 September 2019
Annuals, 40–200 cm. Stems erect, usually densely canescent, hispid, or strigillose, rarely ± hirsute or glabrate. Leaves mostly cauline; mostly alternate; petioles 2–4 cm; blades (often bluish green) lanceolate to deltate-ovate or ovate, 4–15 × 1–8 cm, bases subcordate or truncate to cuneate, margins entire or ± serrate, abaxial faces strigose, sparsely to densely, or not at all, gland-dotted. Heads 1–5. Peduncles 4–15(–40) cm. Involucres ± hemispheric, 10–24 mm diam. Phyllaries 14–25, lance-linear to lanceolate to lance-ovate, 10–14 × 1–4(–5) mm, (margins sometimes ciliate) apices short-attenuate, abaxial faces usually hispidulous, rarely sparsely hirsute to glabrate. Paleae 4.5–7.5 mm, 3-toothed, middle teeth ± ciliate or bearded, hairs whitish, 0.5–0.7 mm. Ray florets 10–30; laminae 15–20 mm. Disc florets 50–100+; corollas 4.5–6 mm, lobes usually reddish, rarely yellow; anthers reddish to purplish, appendages purplish (style branches reddish). Cypselae 3–4.5 mm, ± villous; pappi of 2 aristate scales 1.5–3 mm plus 0–2 erose scales 0.3–0.5 mm. 2n = 34.
Distribution
w North America.
Discussion
Subspecies 2 (2 in the flora).
Helianthus petiolaris is adventive beyond western North America.
A third subspecies has yet to be named at that rank in Helianthus petiolaris; it has been called H. petiolaris var. canescens A. Gray. It differs in having stems, leaves, and phyllaries densely canescent and abaxial faces of leaves densely gland-dotted. It is additionally characterized by peduncles usually ebracteate, phyllaries 1–2 mm wide, disc corolla throats gradually narrowed distal to slight, not densely hairy basal bulges, and 2n = 34. It flowers late spring through late summer and grows on sandy soils in open areas at (10–)1000–2300 m in Arizona, California, Nevada, New Mexico, and Texas and in Mexico. It was treated as H. niveus (Bentham) Brandegee subsp. canescens (A. Gray) Heiser by C. B. Heiser et al. (1969); molecular and morphologic data appear to favor a placement within H. petiolaris.
Selected References
None.
Key
| 1 | Stems usually hispidulous to strigillose; peduncles usually bractless; phyllaries 3–5 mm wide; disc corollas: throats abruptly narrowed distal to densely hairy basal bulbs | Helianthus petiolaris subsp. petiolaris |
| 1 | Stems usually ± hispid; peduncles usually each with leafy bract subtending head; phyllaries 2–3.5 mm wide; disc corollas: throats gradually narrowed distal to slight, not densely hairy, basal bulges | Helianthus petiolaris subsp. fallax |