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Name

Acaciella tequilana (S. Watson) Britton & Rose  var. tequilana

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

Synonymy and types

Acacia penicillata Standl., Contr. U.S. Natl. Herb. 20:  185. 1919. Acaciella penicillata (Standl.) Britton &  Rose, N. Amer. Fl. 23: 104. 1828. Type: Mexico: Oaxaca, Cerro San Felipe, C. Conzattii  & V. González 564 (lectotype, designated here,  US!; isolectotypes, GH!, MEXU!).  Acacia laevis Standl., Contr. U.S. Natl. Herb. 20: 185.  1919. Acaciella laevis (Standl.) Britton & Rose, N.  Amer. Fl. 23: 104. 1928. Type: Mexico: Jalisco, near Guadalajara, C.G. Pringle  11354 (lectotype, designated here, US!; isolectotypes,  MEXU!, NY!).

Formal description

Perennial herb or shrub up to 3 m tall, glabrousglaucous. Stipules to 4 mm long, fugacious. Leaves  9-27(36) cm long; petiole up to 5 cm long, tereteglabrous; rachis (3)8-16(18.5) cm long, glabrous,  with (2)3-8 pairs of pinnae; pinnae (2.5)4-13 cm  long; paraphyllidia 1.5 mm long; leaflets (6)14-30  pairs per pinna, (3)12-15 (20) × 3-8(17) mm, elliptic  to widely elliptic, base oblique, apex rounded,  brochidodromous venation well marked on both  surfaces, glabrous, slightly chartaceous. Inflorescences  usually open terminal panicles, with main  rachis 20-55 cm long, glabrous; peduncles  (1.5)2.5-3.5(4.5) cm long; glabrous, without pearl  glands; inflorescence bracts 1-2 at the peduncle  base, 3.5 mm long, glabrous, naviculiform, fugacious;  flowers white, orange when dry, in short capitulum- like racemes, 15-18(20) mm in diam. at  anthesis; floral bract c. 2 mm long, glabrous, fugacious;  pedicels 1-2 mm long, glabrous. Calyx 0.7  mm long, almost truncate, glabrous. Corolla 3 mm  long, 5-lobed, the lobes to more than half the  whole corolla length, glabrous. Stamens 6 mm  long. Ovary 2 mm long, glabrous, short-stipitate,  the stipe shorter than the ovary; basal nectary 1  mm high. Legume 5.3-8.5 × 0.7-1.3 × 0.3 cm, flat,  straight; valves chartaceous, conspicuously reticulate- veined, glabrous, acute at the base and apex;  stipe 1.8 cm long; beak absent. Seeds 6-7 per fruit,  elliptic to widely elliptic in outline, spherical, 3-  4.5 × 3.5-4.5 × 1-2 mm.

Distribution

Mexico north and central; from  Chihuahua and Durango to Oaxaca and Puebla.

Additional info

Habitat. Quercus and Pinus forest, dry scrub with  Cactaceae. Alt. 900-2500 m. 

Vernacular names and uses. Guasillo, timbre; the  roots are used for tanning. 

Flowering time

Flowering from August to November,  fruiting from September to December. 

Representative specimens

MEXICO:

Chihuahua:

Guanajuato:

Guerrero:

Hidalgo:

Jalisco:

México:

Nayarit:

Oaxaca:

Puebla:

Querétaro:

San Luis Potosí:

Tamaulipas:

Zacatecas:

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