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Bidens lemmonii A. Gray

Family: Asteraceae

Description: Annual composite, rayless, heads subsessile or short-pedunculate; leaves pinnately dissected, the divisions linear, often confused in collections with Heterosperma pinnatum Cav.

Distribution: Southwestern New Mexico, southern Arizona and Mexico (S. Ariz., B.C, Zac, Ags., D.F. as listed in McVaugh 1984; Rzedowski 1985 adds VC. to this list).

Plants Seen or Cited: MEXICO, DISTRITO FEDERAL, near Estaba, 17 Sep 1903, C. G. Pringle 11489 (NMC); DURANGO, MPIO. DURANGO, Predio Santa Bárbara, UAF 8, 23o49'N, 104o55'W, 21 Sep 1989, S. González 4120 (CIIDIR), MPIO. MEZQUITAL, Pajaritos, 3 km al NE, 22o99'N, 104o99'W, 31 Oct 1983, S. González & J. Rzedowski 2288 (CIIDIR); MPIO. PUEBLO NUEVO, El Salto, alrededores 23o46'N, 105o20'W, 4 Oct 1981, González & Acevedo 2043 (CIIDIR); Ca. 40, 104.6 km al W de Durango, cerca de 6.4 km al E de El Salto, 23o50'N, 105o20'W, 24 Aug 1991, J. Soule & D. Lockerman 2806 (CIIDIR); MPIO. SUCHIL, Reserva de la Biosfera La Michilía, Mesa El Burro, 23o23'99"N, 104o17'99"W, 16 Sep 1982, R. Fernández 1135 (CIIDIR). UNITED STATES, ARIZONA, COCHISE CO., Huachuca Mts., Miller Canyon, 1 Sep 1936, C.B. Carter s.n. (NMC); SANTA CRUZ CO. [probably], Santa Rita Mts., 5 Sep 1944, O.M. Clark 12369 (UNM); NEW MEXICO, HIDALGO CO., Animas Mts., Upper Indian Canyon, 4 Oct 1975, W.L. Wagner 1730 (UNM); Peloncillo Mts., Coronado Natl. For., Clanton Draw, 2.3 re mi W of E side of natl. for. by Forest Rd 63 (S18 T32S R21W), 29 Aug 1986, R. Worthington 14943.5 (NMC).

Habitat: Hillsides, grassy openings in dry sparse oak forest or open woodland of oak, pine, and juniper, 2,500-2,700 m (McVaugh 1984); Rocky slopes, 4,500-7,000' (Martin and Hutchins 1981); Sandy open places (Carter s.n.); Lava fields (Pringle 11489); Ridge (Wagner 1730); Granite slopes (Clark 1236); Bosque de pino, 2,500 m (González & Acevedo 2043); Bosque de pino-encino, 2,240 m (González 4120); Bosque de pino-encino (Quercus spp., Pinus con presencia de Alnus), 2,800 m (González & Rzdowski 2288); Bosque de pino, crece in partes soleadas, lugares abiertos y pantanosos, 2,560 m (Soule & Lockerman 2806); Bosque de pino-encino, 2,650 m (Fernández 1135).

Discussion: This species has been treated by numerous authors providing floristic synthesis and none notes the species to be rare (Kearney & Peebles 1969; Martin & Hutchins 1981; McVaugh 1984; Rzedowski 1985). Sherff (1937) in his monograph does not note rarity. Habitats cited in descriptions are not unusual, and in fact are widespread and common. The species ranges from Veracruz in southern Mexico to just north of the Mexico-US border. This species is widespread in habitats that are not limited; peripheral in New Mexico.

Important Literature:

Kearney, T.H. and R.H. Peebles. 1969. Arizona Flora, 2nd ed. (with supplement by J.T. Howell, Elizabeth McClintock, et al.). Univ. California Press, Berkeley. 1085 pp.

Martin, W.C. and C.R. Hutchins. 1981. A Flora of New Mexico, vol. 2. J. Cramer, Vaduz. Pp. 1277-2591.

McVaugh, R. 1984. Flora Novo-Galiciana, vol. 12, Compositae. Univ. Michigan Press, Ann Arbor. 1157 pp.

Rzedowski, J. 1985. Bidens, pp. 525-532 in J. Rzedowski and G. D. de Rzedowski (eds), Flora Fanerogamica del Valle de México, vol. II, Dicotyledonae (Euphorbiaceae-Compositae). Escuela Nacional de Ciencias Biológicas e Instituto de Ecología, México. 674 pp.

Sherff, E.E. 1937. The genus Bidens. Field Mus. Nat. Hist. Bot. Ser. 16:1-709.

Information Compiled By: Richard Spellenberg, 1998

Photo credits in header Peniocereus greggii var. greggii © T. Todsen,
Lepidospartum burgessii © M. Howard, Argemone pleiacantha ssp. pinnatisecta © R. Sivinski
Design: J. Mygatt; Copyright © 1999-2005 New Mexico Rare Plant Technical Council