Isocarpha oppositifolia
Isocarpha oppositifolia, the Rio Grande pearlhead,[2] is a New World species of plants in the family Asteraceae. 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 |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Genus: | Isocarpha |
| Species: | I. oppositifolia |
| Binomial name | |
| Isocarpha oppositifolia | |
| 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
- The Plant List, Isocarpha oppositifolia (L.) Cass.
- USDA, NRCS (n.d.). "Isocarpha oppositifolia". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 5 August 2015.
- Biota of North America Program 2014 county distribution map
- 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
External links
- Conabio, ficha informativa, Isocarpha oppositifolia (L.) Cass. in Spanish with photos
- Photo of herbarium specimen at Missouri Botanical Garden, collected in Guatemala in 2008
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