Astragalus martinii Spellenb., van Devender & Jenkins. Phytoneuron

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

57. Astragalus martinii Spellenb., van Devender & Jenkins. Phytoneuron 66: 1–8. 2014

Type:— MEXICO, Sonora, Mpio. de Yécora, 1 km W of Puerto de la Cruz on MEX 16, N slope of Mesa del Campanero , 30 March 1997, A.L. Reina-G. 97-458 &, T.R. Van Devender (holotype: ARIZ419157 digital image!; isotypes: MEXU!, US01268916 digital image!, US02036158 digital image!) .

Perennial. Stems up to 30 cm long, radiating from the root or simple, prostrate, suberect to erect, strigulose, the trichomes 0.2–0.3 mm long, adpressed, straight, white. Stipules 2–3.5 mm long, clasping, triangular to ovate, sparsely strigose adaxially. Levaes 1.5–10 cm long, leaflets 15–23, 2–10 mm long, oblong, elliptic, obovate to to oblongobovate, rounded, truncate to emarginated apically, abaxially strigulose. Peduncles 2–10 cm long, straight to incurved, the racemes 3–15 mm long, dense or loose, subcapitate, 1–11 flowered, the flowers spreading or ascending. Flowers purple, pale lilar with white tones; the calyx 4.5–6.1 × 1.6–2.3 mm, strigulose, the trichomes dense, white, black or mix of both, the tube 2.5–4 mm long, campanulate to subcylindric, the teeth 1.6–2.3 mm long, linear, laceolate to narrowly triangular; the banner 9.7–11.2 × 5–5.5 mm, ovate, narrowly basally for almost 3.6–4.2 mm long, rounded to notched apically; the wings 8.5–10.5 × 1.6–2.5 mm, the claw 3.5–4.9 mm long, the blade 5–5.6 mm long, oblong-ovoid to obliquely-ovoid, incurved, rounded apically; the keel 6.5–8.2 × 1.9 mm, the claw 3.4–4 m long, the blade 3.4–4.2 mm long, oblong-ovate, incurved, apically triangular-rounded. Pod sessile, 9–12 × 4.4–6.5 mm, tiquetrous, oblongovoid, slightly incurved, basally rounded, distally ending in a short beak, ventrally carinate, laterally convex, dorsally wide-sulcate, the valves stiff to sub-coriaceous, tan turning black with age, strigulose, transversely reticulated, septum complete; seeds 1.3–1.7 mm long, mitten shaped, brown, dull or semi-shiny.

Distribution:— Endemic to Mexico, regionally distributed along the central political border of Sonora and Chihuahua ( Fig. 17 ).

Habitat:— Inhabiting oak-pine forest, 1840 m.

Specimens examined:— SONORA: 7-X-2007, Barranca El Salto, Mesa del Campanero ; pine-oak forest, T. R. Van Devender 2007-1020, A. L. Reina, G. R. Gwiazdowski ( MEXU) ; 10 March 1996, Between El Llano and Campanero, Mesa del Campanero , W of Yécora, A. L. Reina G 96-32, T. R. Van Devender, S. L. Friedman ( MEXU) ; 30 March 1997, Mpio. de Yécora , 1 km W of Puerto de la Cruz on MEX 16, N slope of Mesa del Campanero, A. L. Reina G. 97-458, T. R. Van Devender (MEXU)

Figures

FIGURE 17. Map showing the distribution of Astragalus mario-sousae, A. martinii, A. micranthus var. micranthus, and A. micranthus var. seatoni in Mexico.