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Ageratina riparia

(Creeping Croftonweed)


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Common Names

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Click on the language to view common names.

Common Names in Afrikaans:


Common Names in English:

Creeping Croftonweed, Makani Ageratina Riparia Hamakua Pa, Mist Flower, Mistflower, River Eupatorium, River-Eupatorium, Spreading Mist Flower, Spreading Mistflower, Spreading Snakeroot

Common Names in Hawaiian:

Hamakua Pamakani


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Family Compositae

The largest family of flowering plants , the Compositae (Asteraceae), comprising about 1,100 genera and more than 20,000 species and characterized by many small flowers arranged in a head looking like a single flower and subtended by an involucre of bracts. A head may consist of both ray flowers and disk flowers, as in the sunflower, of disk flowers only, as in the burdock, or of ray flowers only, as in the dandelion.

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]

Physical Description

Habit: Subshrub , Shrub

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


Size: 6-12" tall.


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 .


Typically found in the intertidal zone at the water's edge at a mean distance from sea level of -129.56 meters (-425.07 feet).[2]

Biome: Coastal.


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Duration: Perennial


Culture: Space 24-36" apart.

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)


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Eupatorium havanense Kunth • Eupatorium texense (Torr. and Gray) Rydb.


Name Status: Accepted Name .

Comment: Data Providers: CONABIO, Caribbean Checklist , African Flowering Plants Database , SANBI, New Zealand Plant Name Database, Flora Malesiana, Govaerts World Compositae Checklist A-G, IPNI, Tropicos, Euro+Med, Queensland Census, New South Wales Flora Online. GCC LSID: urn

Last scrutiny: 04-Nov-09

Similar Species

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Members of the genus Ageratina

ZipcodeZoo has pages for 24 species, subspecies, varieties, forms, and cultivars in this genus:

A. adenophora (Crofton Weed) · A. altissima (Richweed) · A. altissima (L.) R.M.King and H.Rob. var. roanensis (Small) Clewell and Wo (Appalachian White Snakeroot) · A. altissima var. altissima (White Snakeroot) · A. altissima var. angustata (White Snakeroot) · A. altissima var. roanensis (White Snakeroot) · 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 (Lesser Snakeroot) · A. aromatica var. incisa (Lesser Snakeroot) · A. havanensis (Havana Snakeroot) · A. herbacea (Fragrant Snakeroot) · A. jucunda (Hammock Snakeroot) · A. lemmonii (Lemmon's Snakeroot) · A. ligustrina (Ageratina) · A. luciae-brauniae (Lucy Braun's Snakeroot) · A. occidentalis (Western Eupatorium) · A. paupercula (Santa Rita Mountains Thorough-Wort) · A. resiniflua (Resinous Snakeroot) · A. riparia (Creeping Croftonweed) · A. rothrockii (Rothrock's Snakeroot) · A. shastensis (Shasta Eupatorium) · A. wrightii (Wright Snakeroot)

More Info

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Further Reading

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Data Sources

Accessed through GBIF Data Portal February 16, 2008:



  1. Guy L. Nesom "Ageratina". in Flora of North America Vol. 21 Page 461, 462, 541, 547, 552. Oxford University Press. Online at [back]
  2. Standard Deviation = 942.020 based on 118 observations. Terrestrial altitude and ocean depth information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 2014-05-14