Helianthus annuus L.
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Details
Nomenclature
L.
L.
1753
904
ICN
Helianthus annuus L.
species
Helianthus annuus
Classification
Vernacular names
Descriptions
Helianthus annuus L.
Erect annual herb, with stout taproot. Stems scabrid, not branched, 0.4- c. 2 m tall. Lower and mid cauline lvs hispidulous, petiolate, ovate- elliptic to ovate-triangular, acute to acuminate, obtuse or truncate to cordate at base, serrate, 6-20-(30) cm long; upper cauline lvs similar to lower, but uppermost alternate, smaller and narrower. Capitula (8)-10-20-(30) cm diam., solitary. Involucral bracts in 2-3 rows, moderately to densely scabrescent, ciliate, ovate to ovate-triangular, aristate, c. 3-6 × (0.8)-1.5-2 cm. Receptacle ± flat; scales membranous, the larger with dark ciliate apices. Ray florets (15)-20-50; disc florets numerous, brownish yellow. Achenes oblong-obovoid, narrowed to base, hairy, 10-15 mm long; pappus 0.
Taxonomic concepts
Collections
Metadata
ca64669a-79cc-41f4-9959-7f6883a56dcd
scientific name
Names_Plants
1 January 2000
20 November 2013