Emex australis


Ann. Sci. Nat., Bot., sér. 2, 9: 195, plate 7. 1838

Common names: Doublegee southern threecornerjack spiny emex
Treatment appears in FNA Volume 5. Treatment on page 487.
Click plate for higher resolution version.
Illustrator: Bee F. Gunn
Plants 1–4(–6) dm. Stems prostrate, decumbent, or ascending, base often reddish, branched proximally. Leaves: ocrea loose, glabrous; petiole (0.5–)1–8(–15) cm, glabrous; blade subhastate to elliptic or ovate, 1–10 × 0.5–6 cm, base truncate to cuneate, apex obtuse to acute. Staminate flowers 1–8 per ocreate fascicle; tepals narrowly oblong to oblanceolate, 1.5–2 mm. Pistillate flowers 1–4 per ocreate fascicle; outer tepals ovate to oblong, 4–6 mm in fruit, inner tepals broadly triangular-ovate, 5–6 mm in fruit, apex mucronate. Fruiting perianths 7–9 × 9–10 mm, spines ascending or spreading, 5–10 mm, base tapering. Achenes 4–6 × 2–3 mm, shiny. 2n = 20.

Phenology: Flowering year-round.
Habitat: Disturbed sites, especially in sandy soils
Elevation: 0-200 m


V5 1016-distribution-map.gif

Calif., Africa (Republic of South Africa), introduced in West Indies (Trinidad), Europe, Asia (India, Pakistan, Taiwan), Africa (Kenya, Madagascar, Malawi, Tanzania, Zimbabwe), Pacific Islands (Hawaii), Australia.




Lower Taxa

No lower taxa listed.

Facts about "Emex australis"
AuthorCraig C. Freeman +
AuthoritySteinheil +
Common nameDoublegee +, southern threecornerjack + and spiny emex +
DistributionCalif. +, Africa (Republic of South Africa) +, introduced in West Indies (Trinidad) +, Europe +, Asia (India +, Pakistan +, Taiwan) +, Africa (Kenya +, Madagascar +, Malawi +, Tanzania +, Zimbabwe) +, Pacific Islands (Hawaii) + and Australia. +
Elevation0-200 m +
HabitatDisturbed sites, especially in sandy soils +
IllustratorBee F. Gunn +
Introducedtrue +
PhenologyFlowering year-round. +
Publication titleAnn. Sci. Nat., Bot., sér. +
Publication year1838 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V5/V5 1016.xml +
Taxon familyPolygonaceae +
Taxon nameEmex australis +
Taxon parentEmex +
Taxon rankspecies +
VolumeVolume 5 +