Astragalus cobrensis A. Gray var. maguirei Kearney, Wash. Jour. Acad. Sci.

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

13. Astragalus cobrensis A. Gray var. maguirei Kearney, Wash. Jour. Acad. Sci. 30: 218. 1940

Type:— USA, Arizona, Cochise County, White Tail Canyon , Chiricahua Mountains , 2 May 1935, B. Maguire et al. 11079 (holotype: US 00004061 digital image!; isotype: ARIZ fdb74774-5ed2-45b8-9e83-1147c3b5f2dc ).

Perennial. Stems up to 15 cm long, decumbent o slightly ascendant, subterranean few centimeters, flexuose, pilose, the trichomes up to 0.8 mm long, rigid, spreading or incurved. Stipules 1.5–5 mm long, the lowest ones connate, lax clasping, forming a collar or a bidentate sheath around the stem, the upper ones attached at the base or up to the half, triangular. Leaves 1–11 cm long, leaflets 7–23, 1.5–17 mm long, oblong, elliptic, obovate to suborbicular, emarginate, bicolored, abaxially lighter, glabrate or subglabrate adaxially. Peduncles 1–8.5 cm long; the racemes 1–7.5 cm long, lax, flowers 8–33, pendulous with age. Flowers whitish with lilac tones; the calyx 3.2–4.5 × 1.6–2.2 mm, strigose, with black and sometimes white scattered trichomes, the tube 2.2–2.7 mm long, campanulate to turbinate-campanulate, the teeth 1–1.8 mm long, subulate; the banner 6.4–7.8 × 4.2–5.9 mm, obovate to rhombic-ovate, retuse; the wings 6.1–7.7 × 1.7–3 mm, the claw 1.9–2.6 mm long, the blade 4.2–5.9 mm long, triangular-obovate, to obliquely-eliptic, incurved; the keel 4.4–6.1 × 1.7–2.3 mm, the claw 1.9–2.7 mm long, the blade 2.5–3.8 mm long, semi-obovate to semicircular, incurved. Pod deflexed, subsessile, the stipe minute or almos absent, 7–15 × 3.5–6 mm, oblong, elliptic or clavate, straight to curved, gradually narrowed at base, apex ending in triangular beak, obcompressed, ventrally convex, flattened to openly sulcate dorsally, the valves green, shiny, the trichomes white, turning papery and ochre with age, reticulate, septum complete, the pod thence bilocular o almost so; ovules 10–13; seeds 2.4–3 mm long, brown, somewhat rugose.

Distribution:— Rare in Mexico, known only from Sierra San Luis at northwestern Sonora, in the border with Chihuahua, and approximately 12 km from the border of New Mexico ( USA). Also, in New Mexico and Arizona ( USA) ( Fig. 4 ).

Habitat:— Near riparian vegetation, associated to elm, mezquite and sycamore, 1200 m (Spellenberg et al, 1995).

Specimens examined:— SONORA: not date, Mpio.Agua Prieta , S. Carnahan n.n., T. Van Devender, A. L. ReinaG., V. Markgraf. Reichenbacher, S. Hale, C. Smith ( USON)

Figures

FIGURE 4. Map showing the distribution of Astragalus coahuilae, A. cobrensis var. maguirei, A. coccineus, A. comonduensis, and A. coriaceus in Mexico.