Alternanthera sessilis

(Linnaeus) R. Brown ex de Candolle

Cat. Pl. Hort. Monsp.,77. 1813

Common names: Sessile joyweed
Basionyms: Gomphrena sessilis Linnaeus Sp. Pl. 1: 225. 1753
Treatment appears in FNA Volume 4. Treatment on page 450. Mentioned on page 448, 449.
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Herbs, annual or perennial, 2–6 dm. Stems procumbent, pubescent in lines, glabrate. Leaves sessile; blade elliptic to oblong or oblanceolate, 1.2–5 × 0.5–2.2 cm, apex obtuse to acute, glabrous. Inflorescences axillary, sessile; heads white, subglobose or ovoid, 0.5–1.1 cm; bracts keeled, ca. 1/2 as long as tepals. Flowers: tepals white, ovate to lanceolate, 2–3.5 mm, apex acuminate, hairs not barbed; stamens 5; anthers 3–5, globose; pseudostaminodes subulate, margins laciniate. Utricles included within tepals, sides exerted in mature fruit, greenish stramineous, obcordate, 1.3–1.7 mm, apex retuse. Seeds lenticular, 0.9–1.1 mm.

Phenology: Flowering summer–early fall.
Habitat: Wet disturbed areas
Elevation: 0-20 m

Distribution

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Ala., Fla., Ga., La., Mexico, West Indies, Central America (Belize, Costa Rica, Guatemala, Nicaragua, Panama), South America, Africa, Asia.

Discussion

Alternanthera sessilis is reported from Maryland, Mississippi, South Carolina, and Texas, but I have seen no specimens from these states.

References

None.

Lower Taxa

No lower taxa listed.

AuthorSteven E. Clemants +
Authority(Linnaeus) R. Brown ex de Candolle +
BasionymsGomphrena sessilis +
Common nameSessile joyweed +
DistributionAla. +, Fla. +, Ga. +, La. +, Mexico +, West Indies +, Central America (Belize +, Costa Rica +, Guatemala +, Nicaragua +, Panama) +, South America +, Africa + and Asia. +
Elevation0-20 m +
HabitatWet disturbed areas +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
Introducedtrue +
PhenologyFlowering summer–early fall. +
Publication titleCat. Pl. Hort. Monsp., +
Publication year1813 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse grained fna xml/V4/V4 884.xml +
Taxon familyAmaranthaceae +
Taxon nameAlternanthera sessilis +
Taxon parentAlternanthera +
Taxon rankspecies +
VolumeVolume 4 +