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• Conservation Status
• Taxonomy
• Physical Description
• Distribution
• Landscaping
• Reproduction
• Growth
• Similar Species
• Bibliography
• More Info
• Notes
• Keep Exploring

Overview:

Conservation Status

Taxonomy

Unambiguous Synonyms:

1. Eupatorium havanense Kunth
2. Eupatorium texense (Torr. & Gray) Rydb.

Notes:

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

Place of publication: Phytologia 19:216. 1970

Name verified on 29-Sep-1992 by ARS Systematic Botanists. Last updated: 22-May-1997

Physical Description

Genus Ageratina:

Perennials, subshrubs, or shrubs [trees], mostly 20-220 cm. Stems usually erect, rarely scandent, sparsely to densely branched. Leaves cauline; mostly opposite (distal sometimes alternate) ; petiolate; blades 3(-5) -nerved from bases, usually deltate, lanceolate, ovate, rhombic, or triangular, sometimes orbiculate, margins entire, crenate, dentate, or serrate, faces glabrous or hispidulous, pilose, or puberulent, sometimes gland-dotted (A. occidentalis, A. adenophora). Heads discoid, usually in compact, (terminal and axillary) corymbiform arrays, sometimes borne singly. Involucres campanulate, 3-6 mm diam. Phyllaries persistent, 8-30 in 2(-3) series, 0- or 2-nerved, lanceolate to linear, ± equal (herbaceous). Florets 10-60; corollas white or lavender, throats obconic to campanulate (lengths 1.5-2 times diams.) ; styles: bases sometimes enlarged, glabrous, branches linear, seldom distally dilated. Receptacles convex (glabrous or hairy), epaleate. Cypselae prismatic or ± fusiform, usually 5-ribbed, scabrellous and/or gland-dotted; pappi usually persistent, sometimes fragile, rarely falling, of 5-40, barbellulate bristles in 1 series. x = 17.

Species ca. 250: North America, Mexico, Central America, Andean South America.^[1]

Habit: Subshrub, Shrub

Flowers: Bloom Period: March. • Flower Color: near white, white

Images:

Distribution

Range and Population

Oceania

Native: .

Landscaping

Landscape Uses: Back border. Cut flowers. • Care: Deer resistant. Tolerant of coastal conditions. Shear after blooming. Follow a regular watering schedule during the first growing season to establish a deep, extensive root system. Remove old flowers to prolong flowering. Cut back to the ground at the end of the season.

Reproduction

Duration: Perennial

Growth

Culture: Space 24-36" apart.

Soil: Soil: Must have well-drained soil. Tolerates clay soil. Prefers humusy soil.

Sunlight: Sun Exposure: Full Sun.

Moisture: Drought Tolerance: High • Water Requirements: Water regularly, when top 3 in. of soil is dry.

Temperature: Cold Hardiness: 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b. (map)

Similar Species

Members of the genus Ageratina:

There are approximately 397 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: A. abronia · A. acevedoana · A. acevedoi · A. acutidentata · A. adenachaenia · A. adenophora (Crofton Weed) · A. aegirophylla · A. ageratoides · A. alexanderi · A. allenii · A. almedae · A. altissima (Richweed) · A. altissima (L.) R.M.King & H.Rob. var. angustata (Gray) Clewell & Woot. · A. altissima (L.) R.M.King and H.Rob. var. roanensis (Small) Clewell and Wo (Appalachian White Snakeroot) · A. altissima var. altissima · A. altissima var. angustata (White Snakeroot) · A. altissima var. oanensis · A. altissima var. roanensis · A. amblyolepis · A. ampla · A. anchista · A. anchistea · A. angustifolia · A. anisochroma · A. apollinairei · A. appendiculata · A. aracaiensis · A. arbutifolia · A. aremphora · A. areolaris · A. aristeguietii · A. aristei · A. aromatica (Lesser Snakeroot) · A. aromatica (L.) Spach var. aromatica (L.) Spach (Lesser Snakeroot) · A. aromatica (L.) Spach var. incisa (Gray) C.F.Reed (Lesser Snakeroot) · A. aromatica var. aromatica · A. aromatica var. incisa · A. arsenei · A. articulata · A. aschenborniana · A. asclepiadea · A. astellera · A. atrocordata · A. austi-smithii · A. austin-smithii · A. ayerscottiana · A. azangaroensis · A. baccharoides · A. badia · A. barbensis · A. barclayae · A. barriei · A. beamanii · A. bellidifolia · A. betulifolia · A. bimatra · A. bishopii · A. blepharilepis · A. bobjansenii · A. boekei · A. boyacensis · A. brandegeana · A. breedlovei · A. brevipes · A. burgeri · A. bustamenta · A. caeciliae · A. calaminthaefolia · A. calaminthifolia · A. calderillensis · A. calophylla · A. camachensis · A. campyloclada · A. capazica · A. capillipes · A. cardiophylla · A. carmonis · A. cartagoensis · A. celestini · A. cerifera · A. chachapoyasensis · A. chapalensis · A. chazaroana · A. chiapense · A. chiapensis · A. chimalapana · A. chiriquensis · A. choricephala · A. choricephaloides · A. ciliata · A. collodes · A. conspicua · A. contigua · A. contorta · A. cordata · A. corylifolia · A. costaricensis · A. crassiceps · A. crassiramea · A. cremasta

Bibliography

• Clewell, A. F. and J. W. Wooten. 1971. A revision of Ageratina (Compositae: Eupatorieae) from eastern North America. Brittonia 23: 123-143
• Henderson, L. 2001. Alien weeds and invasive plants: a complete guide to declared weeds and invaders in South Africa. Plant Protection Research Institute, Handbook 12. (Weeds SAfr 2001)
• Holm, L. et al. 1979. A geographical atlas of world weeds. (Atlas WWeed)
• King, R. M. & H. Robinson. 1987. The genera of the Eupatorieae (Asteraceae). Monogr. Syst. Bot. Missouri Bot. Gard. 22. (Gen Eupat)
• Lazarides, M. & B. Hince. 1993. CSIRO Handbook of Economic Plants of Australia. (Econ Pl Aust)
• Parsons, W. T. & E. G. Cuthbertson. 1992. Noxious weeds of Australia. (Noxweed Aust)
• Seed Regulatory and Testing Branch, Agricultural Marketing Service, U.S.D.A. 1999. State noxious-weed seed requirements recognized in the administration of the Federal Seed Act. (State Noxweed Seed)
• Turner, B. L. 1996–. The comps of Mexico - a systematic account of the family Asteraceae. Phytologia Memoirs. (Comp Mex)
• Wagner, W. L. et al. 1990. Manual of the flowering plants of Hawai'i. (F Hawaii)
• Weber, E. 2003. Invasive plant species of the world: a reference guide to environmental weeds. (Invasive Pl Spec)

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Notes

Contributors:

• Bisby FA, Roskov YR, Orrell TM, Nicolson D, Paglinawan LE, Bailly N, Kirk PM, Bourgoin T, van Hertum J, eds (2008). Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist Taxonomic Classification. CD-ROM; Species 2000: Reading, U.K.
• Global Biodiversity Information Facility. Accessed February 16, 2008. http://www.gbif.org Mediated distribution data from 14 providers.
• USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. National Germplasm Resources Laboratory, Beltsville, Maryland. URL (April 25, 2008)

Data Sources:

Accessed through GBIF Data Portal February 16, 2008:

• Australian National Herbarium
• , Australian National Herbarium
• Bernice Pauahi Bishop Museum, Bishop Museum Natural History Specimen Data
• Comisión nacional para el conocimiento y uso de la biodiversidad, Herbario del Instituto de Ecología, A.C., México
• Comisión nacional para el conocimiento y uso de la biodiversidad, Herbario del Instituto de Ecología, A.C., México
• Missouri Botanical Garden, Missouri Botanical Garden
• National Herbarium of New South Wales, NSW herbarium collection
• USDA PLANTS, USDA PLANTS Database

Identifiers:

• Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 36478
• Global Biodiversity Information Facility Taxonkey: 13749055
• Globally Unique Identifier: urn:lsid:ipni.org:names:94248-3
• Natural Heritage Network Species Identifier: PDASTBX0F0
• U.S.D.A. Plant Symbol: AGRI2
• Zipcode Zoo Species Identifier: 20131

Footnotes:

1. Guy L. Nesom "Ageratina". in Flora of North America Vol. 21 Page 461, 462, 541, 547, 552. Oxford University Press. Online at EFloras.org.