Log In New Account Sitemap
  • Home
  • Specimen Search
    • Search Collections
    • Map Search
    • Exsiccati Search
  • Images
    • Image Browser
    • Search Images
  • Flora Projects
    • Arizona
    • New Mexico
    • Colorado Plateau
    • Plant Atlas of Arizona (PAPAZ)
    • Sonoran Desert
    • Teaching Checklists
  • Agency Floras
    • NPS - Intermountain
    • USFWS - Region 2
    • BLM Flora
    • Coronado NF
  • Dynamic Floras
    • Dynamic Checklist
    • Dynamic Key
  • Additional Websites
    • New Mexico Flores
    • Plant Atlas Project of Arizona (PAPAZ)
    • Southwest Colorado Wildflowers
    • Vascular Plants of the Gila Wilderness
    • Consortium of Midwest Herbaria
    • Consortium of Southern Rocky Mountain Herbaria
    • Intermountain Region Herbaria Network (IRHN)
    • Mid-Atlantic Herbaria
    • North American Network of Small Herbaria (NANSH)
    • Northern Great Plains Herbaria
    • Red de Herbarios del Noroeste de México (northern Mexico)
    • SERNEC - Southeastern USA
    • Texas Oklahoma Regional Consortium of Herbaria (TORCH)
  • Resources
    • Help
    • Webinars
    • Joining a Symbiota Portal
Helianthus × laetiflorus Pers.   (redirected from: Helianthus x laetiflorus Pers. (pro sp.) [pauciflorus × tuberosus])
Go To Encyclopedia of Life...
Family: Asteraceae
Hybrid Sunflower
[Helianthus laetiflorus Pers., moreHelianthus x laetiflorus Pers. (pro sp.) [pauciflorus × tuberosus]]
Helianthus × laetiflorus image
  • FNA
  • Gleason & Cronquist
  • Web Links
Edward E. Schilling in Flora of North America (vol. 21)
Perennials, 100-200 cm (rhizomatous). Stems erect, slightly hairy. Leaves basal and cauline; mostly opposite; petioles 1-5 cm; blades lanceolate to lance-ovate, 10-25 × 2-8 cm, bases cuneate, margins serrulate to serrate, abaxial faces sparsely hispid, gland-dotted. Heads 3-6. Peduncles 7-14 cm. Involucres hemispheric, 14-18 mm diam. Phyllaries 25-35, oblong-lanceolate, 7-12 × 3-3.5 mm (strongly unequal), apices acuminate , abaxial faces usually puberulent, gland-dotted. Paleae 9-10 mm, entire or 3-toothed (apices reddish). Ray florets 15-20; laminae 25-37 mm. Disc florets 75+; corollas 7-7.5 mm, lobes reddish (at least at tips); anthers dark, appendages dark to yellowish (style branches yellow). Cypselae (seldom formed) 4-5 mm, glabrate; pappi of 2 aristate scales 2.5-3.5 mm. 2n = 102. Flowering late summer-fall. Roadsides, fields; 0-300+ m; N.B., Nfld. and Labr. (Nfld.), Ont., Que.; Ala., Conn., Del., D.C., Ga., Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va., Wis. Helianthus ×laetiflorus is introduced in Ontario, Newfoundland, and probably in Quebec; it was excluded from British Columbia by G. W. Douglas et al. (1989-1994, vol. 1); and it was reported in New Brunswick by H. R. Hinds (2000).

Plants called Helianthus ×laetiflorus are usually interpreted to be hybrids and backcrosses of H. tuberosus and H. pauciflorus; they are widely cultivated and often escape. An alternative treatment has been to use the name H. laetiflorus for plants that are treated here as H. pauciflorus, sometimes with infraspecific taxa.

Helianthus atrorubens Lamarck 1789, not Linnaeus 1753, has been applied to plants here called H. ×laetiflorus.

Vascular plants of NE US and adjacent Canada
Much like H. pauciflorus var. pauciflorus, but with yellow disk; lvs often larger and with much longer (to 5 cm) petiole; invol bracts avg a little narrower, generally (2-) 2.5-4 mm wide, less imbricate, more pointed, and occasionally sparsely short-hairy on the back; 2n=102. Roadsides and other disturbed sites, mainly or wholly as an escape from cult., often ±sterile; scattered in e. and midwestern U.S. Aug., Sept. Thought to consist of hybrids and hybrid progeny of H. pauciflorus var. subrhomboideus and H. tuberosus, perhaps mainly a cultigen.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
  • Encyclopedia of Life
  • W3Tropicos
  • USDA PLANTS Database
  • Flora of North America
  • International Plant Names Index
  • Google Search Engine
  • Google Images
  • BOLD Systems - Barcode of Life Data Systems
  • Global Biotic Interactions (GloBI)
  • NCBI - National Center for Biotechnology Information
Helianthus × laetiflorus
Open Interactive Map
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Foster, Nicholas  
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Helianthus × laetiflorus image
Click to Display
100 Initial Images
- - - - -
View All Images
The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)