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December 9, 2016
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Mihai Costea

Convolvulaceae of Sonora, Mexico. I: Convolvulus, Cressa, Dichondra, Evolvulus, Ipomoea, Jacquemontia, Merremia, and Operculina. J. Bot. Res. Inst. Texas 6 (2): 459-527.

Felger, R.S.,Austin, D.F., Van Devender, T.R, J. Sánchez-Escalante, Costea, M.

published: 2012 | Research publication | Article

Based on decades of field work and herbarium research we document 84 species of Convolvulaceae (convolvs) in nine genera for the state of Sonora, Mexico: Ipomoea (41 species), Cuscuta (21), Evolvulus (6), Jacquemontia (4), Merremia (4), Dichondra (3), Convolvulus (2), Operculina (2), Cressa (1). This species richness compares with the more tropical regions of southern Mexico (e.g., Bajío region, Veracruz) and Central America (Costa Rica, Nicaragua). Convolv species occur in a diverse range of plant communities from intertidal zones to mountain conifer forest, with highest diversity in tropical deciduous forest and oak woodlands in ten major vegetation types: tropical deciduous forest (44), oak woodland (34), Sonoran desertscrub (33), foothills thornscrub (31), coastal thornscrub (30), pine-oak forest (27), grassland (13), Chihuahuan desertscrub (11), coastal salt scrub and mangroves (1), and mixed conifer forest (1). Nearly 10 percent of the Sonoran convolvs are not native to the region.

The majority of worldwide and Sonoran convolvs are scandent annuals or herbaceous perennials with twining stems. Three native Sonoran Ipomoea are trees or large shrubs: I. arborescence, I. chilopsidis, and I. seaania. The Cuscuta are annuals when parasitic on annual hosts and some are often perennial, regenerating every year from haustorial tissues left inside the stems of the host when parasitizing perennial woody hosts.

We revise the nomenclature and typification of all the taxa. We give the correct names and synonyms for all taxa and provide special attention to details regarding the place of publication and type specimens. Lectotypes are chosen for nine species. Special attention has been paid to providing correct authorities and publication information in view of incorrect data that circulated in major floristic and biodiversity databases. Dichotomous identification keys, detailed descriptions, phenology, local and global geographic distribution data are provided. Known indigenous names and uses are given for Sonoran convolvs when known.

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revised Oct 12/12

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