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FNA | Family List | FNA Vol. 21 | Asteraceae | Isocarpha

1a. Isocarpha oppositifolia (Linnaeus) Cassini var. achyranthes (de Candolle) D. J. Keil & Stuessy, Syst. Bot. 6: 280. 1981.

Dunantia achyranthes de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 627. 1836

Stems: nodes without axillary fascicles. Leaves mostly sessile, sometimes ± petiolate; blades mostly 2–3(–5) cm × 5–8(–15) mm, without basal auricles. Heads pedunculate (peduncles 2–5 cm) or subsessile (in groups of 2–5). Corollas ca. 1.5 mm. Cypselae ca. 1.5 mm. 2n = 20.

Flowering (Jun–)Oct–Dec. Thickets, clay dunes, shrublands; 0–10 m; Tex.; Mexico; Central America; South America.

The Texas plants are known only from around Brownsville in Cameron County. D. J. Keil and T. F. Stuessy (1981) identified them as var. oppositifolia, noting that they are "probably introduced" there. Distribution of the species continues from Cameron County southward along the Gulf coast of Mexico in Tamaulipas and Veracruz, and the Texas plants are similar to the Mexican ones, which have been identified as var. achyranthes. Abundant Texas material, as described above, fits the description of var. achyranthes, as delimited by Keil and Stuessy.


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