Acanthospermum australe
Revis. Gen. Pl. 1: 303. 1891.
Basionym: Melampodium australe Loefling
Treatment appears in FNA Volume 21. Treatment on page 37.
Revision as of 01:04, 27 July 2019 by FNA>Volume Importer
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.
Phenology: Flowering year round, mostly Jul–Aug.
Habitat: Disturbed, often sandy sites
Elevation: 0–300 m
Distribution
Ala., Ark., D.C., Fla., Ga., La., Mass., Miss., N.C., Oreg., Pa., S.C., Tex., Va., South America, also introduced in Mexico, West Indies, Central America, Europe, Asia, Africa, Pacific Islands (Hawaii).
Discussion
Reports of Acanthospermum xanthioides (Kunth) de Candolle from New York are evidently based on specimens of A. australe.
Selected References
None.
Lower Taxa
None.