Astragalus thurberi A. Gray,

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

publication ID

https://doi.org/ 10.11646/phytotaxa.586.1.1

DOI

https://doi.org/10.5281/zenodo.7713539

persistent identifier

https://treatment.plazi.org/id/0D132D31-FF0A-5FBC-B6AE-A8F7FDB02BB0

treatment provided by

Plazi

scientific name

Astragalus thurberi A. Gray,
status

 

94. Astragalus thurberi A. Gray, View in CoL View at ENA Pl. Nov. Thurb. 312. 1854

Type: — MEXICO, Sonora, “ Near Fronteras, & c. Sonora, in dry places; June 1851, Thurber 372 (holotype: GH 00059442 digital image!; isotype: NY 00005853 digital image!, K 000999394 digital image!, MO-128311 digital image!, GH 00058968 digital image!, NY 01268419 digital image!) .

Tragacantha thurberi (A. Gray) Kuntze View in CoL , Revis. Gen. Pl. 2: 948. 1891. — Phaca thurberi (A. Gray) Kearney View in CoL , Trans. New York Acad. Sci. 14: 34. 1894.

Perennial but of short duration. Stems up to 45 cm long, decumbent and ascending, strigose, trichomes short, up to 0.5 mm long, sub-apressed or straight. Stipules 2–8 mm long, free, deltoid to triangular, somewhat decurrent basally, not connate. Leaves 2–11.5 cm long, leaflets 7–21, 5–18 mm long, linear, oblong, elliptic, to oblanceolate, adaxially truncate o somewhat notched and mucronate. Peduncles hard, 3–9 cm long; the racemes 2–11 cm long, dense, flowers 7–32. Flowers purple, red-purple, red-lilac, rarely white-yellowish; the calyx 3.3–5 × 1.7–2.5 mm, strigose, trichomes white, sometimes few black ones present, the tube 2.2–3 mm long, campanulate, the teeth 1–2.3 mm long, subulate, one pair longer than rest; the banner 5.7–7.1 × 4.2–6 mm, recurved, ovate to suborbicular, basally narrowed, apically slightly retuse; the wings 5.1–6.7 × 1.6–2.4 mm, the claw 1.8–2.5 mm, the blade 3.6–5 mm long, oblong to obovate, distally oblique, incurved; the keel 4.7–5.6 × 1.7–2 mm, the claw 2–2.9 mm long, the blade 2.6–3.4 mm long, apically oblique, somewhat obovate. Pod, when mature, compact in the infrutescence, spike-shaped, oblong-head or even cylindrical, extended or deflexed, sessile, 6–14 × 6–10 mm, inflated like a bladder, basally rounded, distally contracted in a very short beak, sulcate or not so along sutures, the valves green or sometimes with purple tones, strigose, turning papery and ochre with age, reticulate; septum absent; ovules 8–11; seeds 1.7–2.5 mm long, mitten shaped, golden, brown or ochre, smooth, opaque.

Distribution:— In Mexico, recorded only in the northwestern portion, in northern Sonora (from Nogales, north Cananea, Naco to Agua Prieta) and Chihuahua (San Luis, El Valle, El Berrendo to Las Palmas, 31°18’N – 108°18’W), in close proximity to New Mexico and Arizona ( USA). Also, in New Mexico and Arizona ( USA) ( Fig. 26 View FIGURE 26 ).

Habitat:— Rocky hills; volcanic and sandy soils; arid plains; sandy streams; grasslands; disturbed areas, desert scrubs with juniper, prickly-pear, acacia, mesquite, Joshua tree, grasses; disturbed areas with juniper - mesquite; natural grassland with mesquite, Joshua tree, prickle pear; desert grassland; 1166–1402 m.

Comments:— The Mexican geopolitical border between Chihuahua and Sonora along the USA border (New Mexico and Arizona) acontain several species with inflated pods, including A. allochrous , A. mollissimus , A. thurberi , and A. wootonii var. wootonii . Both, Astragalus thurberi and A. wootonii have small flowers (banner averaging 4.6–7.5 mm long, wings 4.1–7.5 mm long, and keel 4.1–6.4 mm long)but they can be differentiated easily by the pod size, which is much longer and wider in A. wootonii (averaging 14–42 mm long, 11–18 mm wide).

Specimens examined:—CHIHUAHUA: 20 March 1984, Rolling hills 0.4 miles east of Highway 2 at a point 5.2 road miles northwest of Arroyo Salto de Ojo and 14.3 miles northwest of Janos, A. C. Sanders 4726, W. Charlton, McIntosh, VanWay, Gibeaut, Gould ( NY) . SONORA: 19 March 1984, Agua Prieta . Along Highway 2, ca. 26 miles east of Agua Prieta and ca. 24 miles west of the state line at Puerto San Luis, A. C. Sanders 4707, W. Charlton, V. Way, McIntosh, Gibeaut, Gould ( CAS, JEPS, SD) ; 20 March 1984, Rolling hills 0.4 miles east of Highway 2 at a point 5.2 road miles northwest of Arroyo Salto de Ojo and 14.3 miles northwest of Janos, A. C. Sanders 4726, W. Charlton, V. Way, McIntosh, Gibeaut, Gould ( NY) ; 1963, 7.9 miles north of Esqueda , I. L. Wiggins 11780 ( CAS, US) ; VI-1851, Dry plains , near Fronteras, G. Thurber 372 ( NY) ; 16 May 2010, Rancho Puerta Blanca , Cuenca Los Ojos, Foundation property, 40.7 km by air E of Agua Prieta, A. L. Reina G., 2010-425, T. Van Devender ( USON) ; 12 April 2003, 4 km SE of Ezqueda, on road to Agua Caliente, A. L. Reina G. 2003-500, T. R. Van Devender ( USON) ; 30 April 2006, 33.7 km E of Agua Prieta on Mex. 2, Rancho Guadalupe, A. L. Reina G. 2007-491, T. R. Van Devender ( USON) ; 10 April 2003, Fronteras — Esqueda A.L. Reina G. 2003-414, T.R. Van Devender, G. Anderson ( MEXU) ; Rancho El Aribabi, Cordón de Las Pilas , a 4.5 km línea recta al SE de la casa del rancho, a 22.4 km al ESE de Imuris, Mpio. Imuris, 2010- 005 A. K. Enriquez et al. ( USON) .

CAS

USA, California, San Francisco, California Academy of Sciences

JEPS

JEPS

USON

USON

MEXU

MEXU

CAS

California Academy of Sciences

JEPS

University of California

SD

San Diego Natural History Museum

USON

Universidad de Sonora

MEXU

Universidad Nacional Autónoma de México

Kingdom

Plantae

Phylum

Tracheophyta

Class

Magnoliopsida

Order

Fabales

Family

Fabaceae

Genus

Astragalus

Loc

Astragalus thurberi A. Gray,

Castillón, Eduardo Estrada, Quintanilla, José Ángel Villarreal, Delgado-Salinas, Alfonso & Rebman, Jon P. 2023
2023
Loc

Phaca thurberi (A. Gray)

Kearney 1894: 34
1894
Loc

Tragacantha thurberi (A. Gray) Kuntze

1891: 948
1891
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