Emex australis

Steinheil
Ann. Sci. Nat., Bot., sér. 2, 9: 195, plate 7. 1838.
Common names: Doublegee southern threecornerjack spiny emex
WeedyIntroducedIllustrated
Treatment appears in FNA Volume 5. Treatment on page 487.

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

Distribution

V5 1016-distribution-map.gif

Introduced; 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.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Emex australis"
Craig C. Freeman +
Steinheil +
Doublegee +, southern threecornerjack +  and spiny emex +
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) +  and Australia. +
0-200 m +
Disturbed sites, especially in sandy soils +
Flowering year-round. +
Ann. Sci. Nat., Bot., sér. +
Weedy +, Introduced +  and Illustrated +
Emex australis +
species +