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• Taxonomy
• Physical Description
• Distribution
• Reproduction
• Growth
• Similar Species
• Bibliography
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Taxonomy

Notes:

Name Status: Accepted Name. Latest taxonomic scrutiny: 15-Mar-2000

Place of publication: Bot. J. Linn. Soc. 82:205. 1981

Name verified on 24-May-2007 by ARS Systematic Botanists. Last updated: 24-May-2007

Physical Description

Genus Pseudognaphalium:

Annuals, biennials, or perennials (sometimes aromatic), (4-) 15-150(-200) cm (usually taprooted, sometimes fibrous-rooted). Stems 1+, usually erect, sometimes decumbent to procumbent (± woolly-tomentose, sometimes stipitate- or sessile-glandular). Leaves basal and cauline or mostly cauline; alternate; usually sessile; blades mostly narrowly lanceolate to oblanceolate, bases often clasping and/or decurrent, margins entire, faces bicolor or concolor, abaxial white to gray and tomentose to velutinous, adaxial usually greenish and glabrous or glabrescent, sometimes grayish and loosely arachnose (sometimes stipitate- or sessile-glandular). Heads disciform, usually in glomerules in corymbiform or paniculiform arrays, sometimes in terminal clusters. Involucres mostly campanulate to cylindric, (3-) 4-7 mm. Phyllaries in (2-) 3-7(-10) series, whitish, rosy, tawny, or brownish (opaque or hyaline, dull or shiny; stereomes usually green, usually sessile-glandular distally), unequal, usually chartaceous toward tips. Receptacles flat, smooth, epaleate. Peripheral (pistillate) florets (15-) 25-250+ (more numerous than bisexual) ; corollas yellowish. Inner (bisexual) florets (1-) 5-20(-40+) ; corollas yellowish (red-tipped in P. luteoalbum). Cypselae oblong-compressed or cylindric, faces usually smooth, sometimes papillate-roughened and/or with 4-6 longitudinal ridges, usually glabrous (papilliform hairs in P. luteoalbum) ; pappi readily falling, of 10-12 distinct (coherent basally in Pseudognaphalium luteoalbum and P. stramineum), barbellate bristles in 1 series. x = 7.

Species ca. 100: worldwide, mostly South America to North America, mostly in temperate regions.

Basal and proximal leaves of Pseudognaphalium species often wither before plants reach flowering. In the key and descriptions here, references to leaves are to cauline leaves of plants at flowering unless otherwise indicated.^[1]

Habit: Forb/herb

Flowers: Bloom Period: July, August, September. • Flower Color: near white, white

Images:

Distribution

Range and Population

North America

Native: Alabama, Arkansas, Connecticut, Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Mississippi, Missouri, New Brunswick, New Hampshire, New Jersey, New York, North Carolina, Nova Scotia, Ohio, Oklahoma, Pennsylvania, Prince Edward Island, Rhode Island, South Carolina, Tennessee, Texas, Vermont, Virginia, West Virginia, Wisconsin.

Reproduction

Duration: Annual, Biennial

Growth

Sunlight: Sun Exposure: Full Sun.

Similar Species

Members of the genus Pseudognaphalium:

There are approximately 65 species, subspecies, varieties, forms, and cultivars in this genus: P. affine · P. andicola · P. antennarioides · P. arizonicum (Arizona Cudweed) · P. attenuatum (Tapered Cudweed) · P. austrotexanum (Texas Rabbit-Tobacco) · P. beneolens · P. bicolor (Two-Color Cudweed) · P. biolettii · P. brachypterum · P. californicum (California Cudweed) · P. canescens (Cudweed) · P. canescens thermale (Wright Cudweed) · P. chartaceum · P. cheiranthifolium · P. conoideum · P. cv · P. domingense (Dominican Cudweed) · P. elegans (Royal Cudweed) · P. frigidum · P. gaudichaudianum · P. gayanum · P. graveolens · P. helleri helleri (Heller's Cudweed) · P. helleri micradenium · P. illapelinum · P. inornatum · P. jaliscense (Jalisco Rabbit-Tobacco) · P. lacteum · P. landbeckii · P. lateo-album · P. leucocephalum (White Cudweed) · P. leucopeplum · P. luteo-album · P. luteo-album affine · P. luteoalbum (Jersey Cudweed) · P. macounii (Macoun's Cudweed) · P. melanosphaerum · P. micradenium · P. montevidense · P. moritzianum · P. obtusifolium (Cats Foot) · P. obtusifolium praecox (Fragrant Cudweed) · P. obtusifolium saxicola · P. oligandrum · P. oxyphyllum · P. petitianum · P. pratense · P. pringlei (Pringle's Cudweed) · P. psilophyllum · P. ramosissimum (Pink Cudweed) · P. richardianum · P. robustum · P. rucillense · P. sandwicensium ('ena'ena) · P. sandwicensium hawaiiense (Rosy Cudweed) · P. sandwicensium molokaiense · P. sandwicensium sandwicensium ('ena'ena) · P. semiamplexicaule · P. semilanatum · P. stramineum (Annual Cudweed) · P. thermale · P. undulatum · P. viravira · P. viscosum (Sticky Cudweed)

Bibliography

• Encke, F. et al. 1993. Zander: Handwörterbuch der Pflanzennamen, 14. Auflage. (Zander ed14)
• FNA Editorial Committee. 1993–. Flora of North America. (F NAmer)
• Huxley, A., ed. 1992. The new Royal Horticultural Society dictionary of gardening. (Dict Gard)
• McGuffin, M. et al., eds. 2000. Herbs of commerce, ed. 2. (Herbs Commerce ed2)
• Nesom, G. L. 2001. Notes on variation in Pseudognaphalium obtusifolium (Asteraceae: Gnaphalieae). Sida 19:615–619.
• Nesom, G. L. 2004d. Pseudognaphalium canescens (Asteraceae: Gnaphalieae) and putative relatives in western North America. Sida 21: 781-790.

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Notes

Contributors:

• Bisby, F.A., Y.R. Roskov, M.A. Ruggiero, T.M. Orrell, L.E. Paglinawan, P.W. Brewer, N. Bailly, J. van Hertum, eds (2007). Species 2000 & ITIS Catalogue of Life: 2007 Annual Checklist. Species 2000: Reading, U.K.
• Global Biodiversity Information Facility. Accessed November 21, 2007. http://www.gbif.org Mediated distribution data from 3 providers.
• USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. URL (April 30, 2008)

Data Sources:

Accessed through GBIF Data Portal November 27, 2007:

• Missouri Botanical Garden, Missouri Botanical Garden
• USDA PLANTS, USDA PLANTS Database

Identifiers:

• Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 507657
• Global Biodiversity Information Facility Taxonkey: 13765588
• Globally Unique Identifier: urn:lsid:ipni.org:names:909626-1
• U.S.D.A. Plant Symbol: PSOB3
• Zipcode Zoo Species Identifier: 57964

Footnotes:

1. Guy L. Nesom "Pseudognaphalium". in Flora of North America Vol. 19, 20 and 21 Page 60, 384, 387, 415, 418, 421, 427, 429. Oxford University Press. Online at EFloras.org.