Acanthospermum australe (Loefl.) Kuntze
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Asteraceae
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Scientific Name
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Description
Species Description - Stems prostrate and often rooting, to 6 dm or more, short-hairy, especially distally; lvs broadly rhombic-ovate or triangular, irregularly toothed above the cuneate, entire base, 1.5–3.5 × 1–3 cm, glandular-punctate, on petioles 3–15 mm; heads 4–6 mm wide at anthesis; burs 7–9 mm, ellipsoid-fusiform to nearly oblong, slightly compressed, densely glandular, 5–7-ribbed, the ribs bearing 1 or 2 rows of hooked prickles 1–2 mm, the top abruptly invaginated and with an evident rim; 2n=22. A weed in sandy soil and waste places, native to trop. Amer., and intr. n. occasionally as far as Mass. and Oreg.
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Common Names
Paraguay-bur