Isocarpha oppositifolia

Isocarpha oppositifolia, the Rio Grande pearlhead,[2] is a New World species of plants in the sunflower family. It is widely distributed in eastern and southern Mexico, Central America, the West Indies (Cuba, Jamaica, Bahamas, Caymans, Trinidad), and northern South America (Colombia, Venezuela). The range extends northward, just barely crossing to the north side of the Río Grande in the two southernmost counties in Texas (Cameron + Hidalgo).[3][4]

Isocarpha oppositifolia
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Tribe:
Eupatorieae
Genus:
Isocarpha
Species:
I. oppositifolia
Binomial name
Isocarpha oppositifolia
(L.) Cass. 1822, conserved name
not R.Br. 1817
Synonyms[1]

Isocarpha oppositifolia is an herb or subshrub up to 150 cm (4.9 ft) tall. Leaves are up to 15 cm (5.9 in) long, usually narrow but sometimes egg-shaped. One plant produces several flower heads, each a long flower stalk, each head with 60-150 disc flowers but no ray flowers.[4]

References
  1. The Plant List, Isocarpha oppositifolia (L.) Cass.
  2. "Isocarpha oppositifolia". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 5 August 2015.
  3. Biota of North America Program 2014 county distribution map
  4. David J. Keil & Tod F. Stuessy. 1981. Systematics of Isocarpha (Compositae: Eupatorieae). Systematic Botany (1981) 6(3): pp. 258-287 descriptions, line drawings, distribution maps for all 5 species


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