Flora of North America species comparison

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Acanthospermum australe

Paraguay starburr, Paraguayan starbur, Paraguayan starburr, southern starbur
Habit Plants 10–60(–120+) cm.
Stems

± procumbent.
Leaf

blades deltate to ± rhombic or ovate, 13–37 × 7–32 mm, faces sparsely scabrellous to glabrate or glabrescent, gland-dotted.
Fruits

plumply ellipsoid to fusiform, weakly compressed, 7–9+ mm, 5–7-ribbed, lacking terminal spines, prickles ± uncinate, mostly along ribs.
2n

= 22.

Acanthospermum australe
Phenology Flowering year round, mostly Jul–Aug.
Habitat Disturbed, often sandy sites
Elevation 0–300 m [0–1000 ft]
Distribution
from FNA
AL; AR; DC; FL; GA; LA; MA; MS; NC; OR; PA; SC; TX; VA; South America [Introduced in North America; also introduced in Mexico, West Indies, Central America, Europe, Asia, Africa, Pacific Islands (Hawaii)]
[WildflowerSearch map]
[BONAP county map]
Discussion

Reports of Acanthospermum xanthioides (Kunth) de Candolle from New York are evidently based on specimens of A. australe.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 37. Treatment author: John L. Strother.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Melampodiinae > Acanthospermum
Sibling taxa
A. hispidum, A. humile
Synonyms Melampodium australe
Name authority (Loefling) Kuntze: Revis. Gen. Pl. 1: 303. (1891)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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