Research in the Sierra Madre Occidental of Eastern Sonora, Mexico:

New and Endemic Plants from the Yécora Area

Thomas R. Van Devender and Ana L. Reina G.

The flora of the Municipio de Yécora contains at least 76 species of plants that are the first records for Sonora; some of these were reported in Reina G. et al. (1997). Many more are range extensions within the Río Mayo Region (Martin et al. 1998). The Yécora area has a very high rate of endemism considering that it is in the mainland Sierra Madre and not an isolated mountain range. Since 1977, plants new to science have been discovered regularly including 30 published and 15 unpublished taxa. New species discovered/published in the Municipio de Yécora during this study include the Agua Amarilla spider lily (Hymenocallis clivorum), a composite (Tridax yecorana), deer vetch (Lotus sp. nov., euphorbs (Croton yecorensis, Euphorbia sp. nov.), indigobush (Dalea sp. nov.), two locoweeds (Astragalus spp. nov.), a mint (Sphacele sp. nov.), Reina fleabane (Erigeron reinana), Trauba spiderling (Boerhavia traubae), Yécora chinchweed (Pectis vandevenderi), Yécora monkeyflower (Mimulus yecorensis), Yécora pine (Pinus yecorensis), Yécora purslane (Portulaca yecorensis), Yécora spike rush (Eleocharis yecorensis, and Yécora twinberry (Menodora yecorana). Bare areas in open pine-oak forest on the mudflow deposits of the Baucarit Formation support a surprisingly diverse flora including a number of new species.

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Adams, R. P. 2000. Systematics of the smooth leaf margin Juniperus of the western hemisphere based on leaf essential oils and RAPD DNA fingerprinting. Biochemical Systematics and Ecology 28:149-162.

Barneby, R. C. 1977. Daleae Imagines. Memoirs of The New York Botanical Garden 27:469-470, 817.

Bogler, D. J. 1998. Three new species of Dasylirion (Nolinaceae) from Mexico and a clarification of the D. longissimum complex. Brittonia 50:71-86.

Debreczy, Z. and I. Rácz. 1995. New species and varieties of conifers from Mexico. Phytologia 78:217-243.

Frank, G. R. W. 1978. Kakt. and Sukk. 29:74-77.

Glass, C., and R. Foster. 1979. New nomenclature combinations in the Cactaceae. Cactus and Succulent Journal (US) 51:124.

Hawksworth, F. G. and D. Wiens 1989. Two new species, nomenclatural changes, and range extensions in Mexican Arceuthobium (Viscaceae). Phytologia 66:5-11.

Henrickson, J., and T. R. Van Devender. 1999. A new species of Portulaca (Portulacaceae). Sida 18:1001-1007.

Laferriére, J. E. 1990. Hymenocallis pimana (Amaryllidaceae): A new species from northwestern Mexico. Phytologia 68:255-259.

Laferriére, J. E. 1998. A New Hymenocallis (Amaryllidaceae) from Sonora, Mexico. Novon 8:242-243.

Laferriére, J. E. and D. J. Keil. 1991. Pectis pimana (Asteraceae: Tageteae): A new species from northwestern Mexico. Madroño 38:195-197.

Laferriére, J. E., and J. S. Marroquín 1990. Berberis pimana (Berberidaceae): A new species from northwestern México. Madroño 37:283-288.

Nesom, G. L. 1998. Two new species of Erigeron (Asteraceae: Astereae) from Mexico. Phytologia 85:288-291.

Nesom, G., and J. E. Laferriére. 1990. A new species of Laennecia (Asteraceae: Astereae) from Chihuahua. Phytologia 68:202-204.

Reina, A. L., T. R. Van Devender, and A. Búrquez M. 1997. Noteworthy Collections. Sonora Madroño 44:206-210.

Roalson, E. H. 1999. Eleocharis yecorensis (Cyperaceae), a new species of spike-sedge from Mexico. Aliso 18:57-60.

Spellenberg, R. 1999. A new Boerhavia (Nyctaginaceae) from Sonora, Mexico. Madroño 46:208-211.

Steinmann, V. W., and R.S. Felger. 1997. The Euphorbiaceae of Sonora, México. Aliso 16:1-71.

Turner, B. L. 1987a. The Ageratina mairetiana complex. Phytologia 63:425.

Turner, B. L. 1987b. New species and combinations in Ageratina (Asteraceae-Eupatorieae) from México. Phytologia 64:14-29.

Turner, B. L. 1993. Two new species of Senecio (Asteraceae) from Sonora, Mexico. Phytologia 74:382-384.

Turner, B. L. 1995. A new species of Pectis (Asteraceae, Tageteae) from Sonora, Mexico. Phytologia 79:133-135.

Turner, B. L. 1995. Tridax yecorana (Asteraceae, Heliantheae) a new species from Sonora, Mexico. Phytologia 79:286-288.

Turner, B. L. 1996. Two new species of Senecio (Asteraceae) from Sonora, Mexico. Phytologia 80:95-99.

Van Devender, R. K., and P. D. Jenkins. 1993. A new species of Browallia (Solanaceae) from the southwestern United States and northwestern Mexico. Madroño 40:214-223.

Van Devender, T. R., and B. L. Turner. 1997. A new species of Menodora (Oleaceae) from the Sierra Madre Occidental in eastern Sonora, México. Phytologia 82:269-272.

Vickery, R. K. 1997. A systematic study of the Mimulus wiensii complex (Scrophulariaceae: Mimulus section Simiolus), including M. minutiflorus, new species from western Mexico. Madroño 44:384-393.


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