Alternanthera philoxeroides

(Martius) Grisebach

Abh. Königl. Ges. Wiss. Göttingen 24: 36. 1879

Common names: Alligatorweed
Basionyms: Bucholzia philoxeroides Martius Beitr. Amarantac., 107. 1825
Synonyms: Achyranthes philoxeroides (Martius) Standley
Treatment appears in FNA Volume 4. Treatment on page 448. Mentioned on page 449.
Herbs, perennial, aquatic to semiterrestrial, stoloniferous, to 50 dm. Stems prostrate, forming mats, often fistulose, glabrous. Leaves sessile; blade narrowly elliptic, elliptic, or oblanceolate, 3.5–7.1 × 0.5–2 cm, herbaceous, apex acute to obtuse, glabrous. Inflorescences terminal and axillary, pedunculate; heads white, globose, 1.4–1.7 cm diam.; bracts not keeled, less than 1/2 as long as tepals. Flowers: tepals monomorphic, white, lanceolate or oblong, 6 mm, apex acute, glabrous; stamens 5; pseudostaminodes ligulate. Utricles not seen. Seeds not seen.

Phenology: Flowering early spring–summer.
Habitat: Ponds, ditches, streams, bayous
Elevation: 0-200 m


V4 880-distribution-map.gif

Ala., Ark., Calif., Fla., Ga., Ill., Ky., La., Miss., N.C., S.C., Tenn., Tex., Va., West Indies, native to South America.


Alternanthera philoxerioides is said to reproduce only vegetatively in North America. I have seen no fruit or seed.



Lower Taxa

No lower taxa listed.

AuthorSteven E. Clemants +
Authority(Martius) Grisebach +
BasionymsBucholzia philoxeroides +
Common nameAlligatorweed +
DistributionAla. +, Ark. +, Calif. +, Fla. +, Ga. +, Ill. +, Ky. +, La. +, Miss. +, N.C. +, S.C. +, Tenn. +, Tex. +, Va. +, West Indies + and native to South America. +
Elevation0-200 m +
HabitatPonds, ditches, streams, bayous +
IllustratorYevonn Wilson-Ramsey +
Introducedtrue +
PhenologyFlowering early spring–summer. +
Publication titleAbh. Königl. Ges. Wiss. Göttingen +
Publication year1879 +
ReferenceNone +
Source xml grained fna xml/V4/V4 880.xml +
SynonymsAchyranthes philoxeroides +
Taxon familyAmaranthaceae +
Taxon nameAlternanthera philoxeroides +
Taxon parentAlternanthera +
Taxon rankspecies +
VolumeVolume 4 +