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Zenodo
2023
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| Accesso online: | https://doi.org/10.5281/zenodo.7713455 |
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- <p><b>2.</b> <i>Astragalus allochrous</i> A. Gray, Proc. Amer. Acad. 13: 366. 1878</p><p>Type: <b>—</b> USA, Near Wickenburg, Arizona, <i>E. Palmer 588,</i> 1876 (Holotype: GH 00058622 digital image!; isotype: NY!).</p><p><i>Phaca allochroa</i> (A. Gray) Rydb., Fl. Rocky Mts. 487: 1063. 1917.</p><p><b>Annual, or perennial</b> for a short time. <b>Stems</b> up to 50 cm long, suberect to decumbent or when prostrate, the branches radiating from the center and forming a circle, frequently with purple tones at base, strigose, trichomes up to 0.7 mm long, adpressed. <b>Stipules</b> 1.4–7 mm long, triangular, ovate to triangular, acuminate, clasping, not connate, more evident in the lower nodes, surrounding the half or almost the complete stem´s circumference in upper nodes. <b>Leaves</b> 3–10 cm long, leaflets 9–21, 0.4–2.1 cm long, linear, oblong, elliptic to obovate or oblanceolate, acute, obtuse or retuse apically, occasionally mucronate, adaxially pubescent or glabrate. <b>Peduncles</b> 3–11 cm long, curved and ascendant, the external ones humistrate and ascending when fruit rippens; racemes 2–12 cm long, lax, flowers 10–30, ascendant at the beginning. <b>Flowers</b> pink, reddish to purple, white or whitish, becoming violet when dry, the banner white, purple veined, wings and keel purple; the calyx 3.6–5.6 × 1.9–3.6 mm, strigose, trichomes white or, black and white mixed, tube commonly campanulate, 2.4–3.5 mm long, the teeth 1–2.5 mm long, subulate to lanceolate, ventral pair the longer; banner 7–9.4 × 5–7.2 mm, ovate to spathulate; the wings 6.5–8.3 × 2.2–2.7 mm, claw 2.2–3.1 mm long, blade 4.5–4.7 mm long, oblique-obovate; the keel 6.2–7.5 × 2.1–2.6 mm, the claw 2.5–3.2 mm long, the bade 3.8–4.5 mm long, incurved, oblique-triangular. <b>Pod</b> 2–4.5 × 1–2 cm, sessile or minutely elevated on the receptacle, spread to pendulous, elliptic, obliquely-elliptic, inflated, bladder-like, with asymmetric margins, narrow at both ends, the apex ending in a 3–6 mm long beak, dorsal suture strongly convex, valves strigose, at times with purple tones, papyraceous, translucent, lustrous, ochre, transversely reticulated, septum absent, soon caducous; ovules 10–21; seeds 2.5–3.2 mm long, semicircular, brown, greenish-brown, sometimes mottled with purple.</p><p><b>Distribution:—</b> In Mexico, distributed in the northwestern region, north (Nogales, Sáric, Ímuris, Magdalena, Benjamín Hill) and northeast (Cananea, Agua Prieta, Nacozari, Fronteras, Esqueda) Sonora, central (Chihuaua), western-central and northwest (Janos, Nuevo Casas Grandes, Cuauhtémoc) Chihuahua. Also, in Arizona and New Mexico (USA) (Fig. 2).</p><p><b>Habitat:—</b> In granite, gravel, sandy, and occasionally in calcareous soils; stony and rocky slopes and streams; Sonoran desert scrub; desert plains with scrublands and sahuaro; desert scrubland with columnar cacti; grasslands with Josua tree and creosote bush; mesquite scrublands; grassland with mesquite and oaks, adjacent to marshes; lowlands with oaks and grasses; frequent roadside; roadside with burr sage; along marsh; 825–1450 m.</p><p><b>Comments:—</b> This species is sympatric and morphologically similar to <i>A. wootoni</i>. Tthese two species can be differentiated by their pod shape, as <i>A. wootoni</i> has a symmetrical pod, the margins of the valves are equilateral seen in profile view, in addition, the pod lacks a peak, if present, this is minute.</p><p><b>Specimens examined:—CHIHUAHUA</b>: 4 March 1977, 43 mi. sw of Palomas at minera Bismark turnoff, <i>N. D. Atwood 21592, J. Spencer</i> (NY); 9 April 1997, <i>E. Estrada 6897, C. Yen.</i> (CFNL) <b>SONORA</b>: 8 March 2003, Reservoir El Yeso, ca. 6.5 km southeast of Magdalena, north of SON 54 (to Curcurpe), <i>T. R. Van Devender 2003-154</i> (MEXU, NY); 4 April 2007, Arroyo Guadalupe, Rancho Guadalupe, Ejido Oquita Montenegro, ca. 37 km east of Agua Prieta, <i>A. L. Reina G. 2007-370, T.R. Van Devender, J. F. Wiens, J. Moore</i> (NY); 9 April 2003, 1.4 km south of Agua Prieta on Mex 17; Chihuahua desert scrub, <i>T. R Van Devender 2003-357, A. L. Reina, G. Anderson</i> (CAS, MEXU); 4 April 1963, Sonora. 2 miles W of Santa Ana, <i>Gentry 19892, Argüelles</i> (MEXU, US); 10 April 2003, Esqueda, <i>A. L</i>. Reina G. 2003-413, T. <i>Van Devender</i>, C. Anderson (USON); 8 April 2003, Reservoir El Yeso, Mpio. Magdalena, ca. 6.5 km SE of Magdalena, <i>T. R. Vand Devender 2003-154, A. L. Reina G.</i> (USON); 9 April 2003, 1 KM SOUTH OF Agua Prieta, on Mex. 17, <i>T. Van Devender 2003-357, A. L. Reina, G. Anderson</i> (USON); 11 May 1948, Durango, 5.3 mi. no. of Esqueda on road to Agua Prieta, <i>I Wiggins 11776</i> (MEXU).</p>