Helianthus nuttallii Torrey & A. Gray (Q2762)
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Helianthus nuttallii is a taxon with the rank species within the genus Helianthus
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| English |
Helianthus nuttallii Torrey & A. Gray
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Helianthus nuttallii is a taxon with the rank species within the genus Helianthus
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Statements
taxon/id/Helianthus nuttallii Torrey & A. Gray
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Helianthus nuttallii Torrey & A. Gray
Helianthus nuttallii
Torrey & A. Gray
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 21: Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford University Press, New York.
accepted
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CA-AB
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CA-BC
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CA-MB
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CA-ON
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CA-QC
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CA-SK
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US-AZ
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US-CA
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US-CO
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US-ID
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US-IA
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US-KS
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US-MN
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US-MO
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US-MT
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US-ND
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US-NM
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US-NE
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US-NV
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US-OK
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US-OR
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US-SD
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US-UT
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US-WA
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US-WY
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Stems (usually yellowbrown or greenish, sometimes glaucous) erect, glabrous, hispid, ± hirsute, or scabrous.
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all or mostly opposite to mostly alternate;
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petioles 0.5–1.5 cm;
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blades light to dark green, 3-nerved (distal to bases) ± lanceolate to ± ovate, 4–20 × 0.8–4 cm, bases cuneate, margins entire or ± serrate (flat), abaxial faces hispid to hispidulous or tomentulose to villous-tomentose, glanddotted.
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Peduncles 1–18 cm.
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Involucres hemispheric, 10–20 mm diam.
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Phyllaries 30–38 (loose, spreading), lanceolate to lanceovate, 8–16 × 1.5–3 mm, (margins ciliate) apices acute to acuminate, abaxial faces usually ± strigose, rarely glabrate, not glanddotted.
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Paleae 8–12 mm, 3-toothed.
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Ray-florets 10–21;
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laminae 20–25 mm (abaxial faces not glanddotted).
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Disc-florets 60+;
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corollas 5–7 mm, lobes yellow;
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anthers dark-brown to black, appendages yellow.
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Cypselae 3–5 mm, glabrate;
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pappi of 2 aristate scales 2.2–4.5 mm plus 0–2 lanceolate scales 0.5–1 mm. 2n = 34 (subspecies unknown).
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alternate
mostly opposite-to-mostly
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less lanceolate
more or less ovate
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hispidulous or tomentulose
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strigose
usually more or less
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