Helianthus Linnaeus (Q2749)
Helianthus is a taxon with the rank genus within the tribe Heliantheae
| Language | Label | Description | Also known as |
|---|---|---|---|
| English |
Helianthus Linnaeus
|
Helianthus is a taxon with the rank genus within the tribe Heliantheae
|
Statements
taxon/id/Helianthus Linnaeus
0 references
Helianthus Linnaeus
Helianthus
Linnaeus
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
1 reference
Stems erect or ascending to decumbent or procumbent, usually branched distally.
1 reference
petiolate or sessile;
1 reference
blades usually 3-nerved (1-nerved in H. eggertii, H. smithii, and H. maximiliani), mostly deltate, lance-linear, lanceolate, lanceovate, linear, or ovate, bases cordate to narrowly cuneate, margins usually entire or serrate, rarely lobed, faces glabrous or hairy, often glanddotted.
1 reference
Heads usually radiate (sometimes discoid in H. radula), borne singly or in ± corymbiform, paniculiform, or spiciform arrays.
1 reference
Involucres usually ± hemispheric, sometimes campanulate or cylindric, 5–40+ (–200+ in cultivars) mm diam.
1 reference
Phyllaries persistent, 11–40 (–100+ in cultivars) in 2–3+ series (subequal to unequal).
1 reference
Receptacles flat to slightly convex (conic in H. porteri), paleate (paleae ± conduplicate, usually rectangular-oblong, usually ± 3-toothed, sometimes entire, apices sometimes reddish or purplish).
1 reference
Ray-florets usually 5–30+ (–100+ in cultivars), rarely 0, neuter;
1 reference
corollas usually yellow.
1 reference
Disc-florets (15–) 30–150+ (–1000+ in cultivars), bisexual, fertile;
1 reference
corollas yellow or reddish (at least distally), tubes shorter than campanulate throats, lobes 5, triangular (style-branches slender, appendages ± attenuate).
1 reference
Cypselae (usually purplish black, sometimes mottled) ± obpyramidal, ± compressed (glabrous, glabrate, or ± hairy);
1 reference
pappi 0 (H. porteri), or readily falling, of 2 (–3) usually lanceolate, aristate, or erose scales (at the 2 principal angles, 1–5 mm) plus 0–8 usually shorter scales (0.2–2 mm).
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
in more or less corymbiform , paniculiform or spiciform , arrays
1 reference
1 reference
1 reference
1 reference
hemispheric
usually more or less
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference
1 reference