Name

Acaciella barrancana (H. Gentry) L. Rico

Rico Arce & Bachman
Anales del Jardín Botánico de Madrid
Vol. 63(2): 189-244
July-December 2006

Synonymy and types

Acacia barrancana H. Gentry, Brittonia 6(3): 312, fig.  2. 1948, basion. Type: Mexico: Durango; Sierra Tres Picos [Cerro Tres  Picos, 25º03' N, 107º00' W], 20 Dec. 1939, H.S.  Gentry 5298 (holotype, MICH; isotypes, MEXU!,  MO!, NY, US).

Formal description

Shrub to 2 m tall, glabrous. Stipules not seen. Leaves  to 16 cm long; petiole 2-3(4) cm long, channelled  above, glabrous; rachis 8-12 cm long, glabrous, with  up to 5 pairs of pinnae per leaf; pinnae 7-10 cm long;  paraphyllidia 2 mm long; leaflets 30-50 pairs per pinnae,  4-9 × 1-3 mm, oblong, base truncate, apex acute,  sometimes rounded, the venation brochidodromous,  the midvein submarginal at base, central at apex,  glabrous, membranaceous. Inflorescences not seen.  Legume 6-6.5 × 6-8 × 0.3 cm, flat, straight, valves chartaceous,  conspicuously reticulate-veined, glabrous,  acute at the base and apex; stipe 0.5 cm long; beak 3  mm long. Seeds 5-6 per fruit, circular in outline,  spherical, 4-5 × 4.3 × 1.5-1.8 mm.

Distribution

Mexico north, Chihuahua and Durango.

Additional info

Habitat. Dry scrub with palms and Quercus. Alt.  1000-1200 m.

Flowering time

Fruiting in October and December

Representative specimens

MEXICO:

Chihuahua:

• Barranca de Batopillas, E of La Bufa, E  slopes of Arroyo la Bufa, 27º 07' N, 107º 35' W, 1000 m, 6-X-1975,  Bye, R. 6938 (MEXU).

Durango:

• Sierra Tres Picos [Cerro Tres Picos],  25º 03' N, 107º 00' W, 1150 m, 20-XII-1939, Gentry H.S.  5298 (MEXU, MICH, MO, NY).

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