Astragalus nuttallianus DC var. nuttallianus

Castillón, Eduardo Estrada, Quintanilla, José Ángel Villarreal, Delgado-Salinas, Alfonso & Rebman, Jon P., 2023, The genus Astragalus (Leguminosae: Papilionoideae: Galegeae) in Mexico, Phytotaxa 586 (1), pp. 1921-1935 : 1921-1935

62.4. Astragalus nuttallianus DC var. nuttallianus

Type:— USA, Arkansa (sic), On the plains of Red River , cultivated in the garden of the University of Pennsylvania, not date, Nuttall s.n. (holotype: PH (not found); isotype: BM000795463 digital image!; lectotype: G. Engelmann s.n. MO-149254 digital image!;) .

Astragalus nuttallianus DC., Prodr. [A. P. de Candolle] 2: 289. 1825. — Hamosa nuttalliana (DC.) Rydb., Small, Fl. S. E. U. S. 617: 1332. 1903. — Astragalus nuttallianus DC. var. enneajugus M. E. Jones, Contrib. W. Bot. 8: 22. 1898. — Astragalus nuttallianus DC. var. quadrilaterlis M. E. Jones Contrib. W. Bot. 8: 22. 1898.

A. micranthus Nutt., Jour. Acad. Philad. 2: 122. 1821 (non Desv. 1814). — Tragacantha micrantha Kuntze, Revis. Gen. Pl. 2: 941. 1891.

Foliage dark-geen, the leaflets regardless of their shape, always all retuse or truncate and the ovary glabrate.

Distribution:— In Mexico, recorded in northeastern Coahuila (municipallity Sabinas) and northern Nuevo León (municipallity Villaldama). Also, in Oklahoma, Arkansas, and Texas into the USA ( Fig. 19 ).

Habitat:— Rocky slopes; scrublands; acacia scrubland; oak forest; 1170 m.

Speciemens examined:— COAHUILA: 16 February1987, Carretera Roncesvalles.Barroterán , Mpio. Múzquiz, R. Vázques s.n. ( ANSM, ENCB) ; 3 April 1969, 56 miles south of Eagle Pass , Texas, E. Lehto 15774, Pinkava, Keil ( NY) . NUEVO LEON: 16 April 2001, Rancho Minas Viejas , camino hacia las Pilas, Mpio. Villadlama, E Estrada 12376 ( CFNL) ; 17 March 1981, Carretera Monterrey-Lampazos, Cerro Colorado, Mpio. Lampazos, O. Briones 536 ( ANSM) ; n.d. March 1981, Montemorelos, M. Almaguer s.n. ( ANSM, CIIDIR) .

62.5. Astragalus nuttallianus DC. var. trichocarpus Torr. & A. Gray, Fl. N. Amer. 1: 333. 1838

Type:— USA, Texas, 1833, T. Drummond s.n. (holotype: NY 00005570 !; isotype: US 00004252 digital image!, BM 001042704 digital image!) .

Astragalus trichocarpus Scheele , Flora 26 (No. 27): 442. 1843.

Leaflets elliptic to ovate, obtuse to acute, rarely some leaflets retuse; calyx teeth 1.5–3 mm long, the trichomes hispid to ciliate, up to 1.2 mm long; pod hirsute, the trichomes up to 1mm long.

Distribution:— Exclusive of north of Mexico, at several isolated localities; central Chihuahua (surrounding Chihuahua City, 28°39’N – 106°05’W), northwest Durango (Tepehuanes and Luis Moya, 25°20’N – 105°43’W) and southwest Coahuila (Estación Carneros, 25°07’N –10106’W). Also, in Texas ( USA) ( Fig. 19 ).

Habitat:— Clayey, sandy, gravelly and stony soils; desert scrub; acacia scrubland; grasslands; 200–1981 m.

Comments:— Sometimes forming dense colonies, giving the landscape a bluish color.

Specimens examined:—CHIHUAHUA: 4 April 1885, Hills and plains near Chihuahua, C. G. Pringle 276 ( NY, MEXU, US) ; 13 April 1891, Puente de St. Diego , C. V. Hartman 595 ( NY) ; 14 April 1886, Plains near Chihuahua, C. G. Pringle 853 ( NY) ; 1–21 May 1908, Vicinity of Chihuahua , E. Palmer 171 ( NY) . COAHUILA: 23 October 1963, Carneros Pass , 23 miles s. of Saltillo, H. D. Ripley, R. C. Barneby 13268 ( NY) ; DURANGO: 10 November 1963, Luis Moya, H. D. Ripley, R. C. Barneby 13508 ( NY) ; 4–25 June 1906, Tepehuanes, E. Palmer 259 ( NY) ; 4 June 1906, Collected at Tepehuanes, E. Palmer 259 ( NY) .

62.6. Astragalus nuttallianus DC. var. zapatanus Barneby, Field and Lab. 24: 36. 1956

Type:— USA, Texas, Webb. County, Laredo , 15 March 1917, E. J. Palmer 11289 (holotype: NY 00005571 !) .

Foliage dark-geen, the leaflets regardless of their shape, always all retuse or truncate and the ovary pubsecent.

Distribution:— Restricted in Mexico northern Tamaulipas, along the Bravo River (Fig. 60). Also, in Texas ( USA) ( Fig. 19 ).

Specimens examined:— TAMAULIPAS: 2 December 1939 , Tamaulipas, H. LeSueur ( TEX-LL); 17 March 1962 , Tamaulipas, M. Domínguez M., W. L. McCart ( TEX-LL) . TEXAS: 15 March 1917, Webb County, Laredo, E. J. Palmer 11289 ( NY) .

Figures

FIGURE 19. Map showing the distribution of Astragalus nuttallianus var. nuttallianus, A. nuttallianus var. austrinus, A. nuttallianus var. cedrosensis, A. nuttallianus var. imperfectus, A. nuttallianus var. trichocarpus, and A. nuttallianus var. zapatanus in Mexico.