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Name

Acaciella painteri var. houghii (Britton & Rose) L. Rico

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

Synonymy and types

Acaciella houghii Britton & Rose, N. Amer. Fl. 23:  103. 1928. basion. Type: Mexico: Morelos, near Cuernavaca [18º 55'N,  99º 15'W], J.N. Rose & Walter Hough 4367 (holotype,  NY!; isotype, US!). 

Acaciella submontana Britton & Rose, N. Amer. Fl.  23: 103. 1928. Type: Mexico: Nayarit, Mpio. Tepic, near San Blasito  [20º 40'N, 104º 16'W], 4 Aug. 1897, J.N. Rose 3345  (holotype, NY!; isotype, US).

Formal description

Shrub to 5 m tall, glabrous, occasionally pubescent  on very young stems. Stipules linear to lanceolate, 3-  3.5(4) mm long, with long erect hairs, fugacious.  Leaves 8.5-10(12) cm long; petiole 2-2.5 cm long,  slightly channelled, glabrous or glabrescent; rachis 1-  3 cm long, glabrescent, with 3-8 pairs of pinnae; pinnae  4-5.5 cm long; paraphyllidia c. 1 mm long; leaflets  (16)34-40 pairs per pinna, 4.5-7(12) × 1.5-2(3) mm,  linear-oblong, base oblique, apex rounded to acutevenation brochidodromous, usually glabrous, sometimes  slightly pubescent on the base of the midvein,  margin very short-ciliate, membranaceous. Inflorescences  consisting of clusters 2-3, racemes axillary  or terminal, usually on a main axis 8.5-20 cm long, glabrescent; peduncles 0.7-1 cm long; glabrous or  glabrescent, without pearl glands; inflorescence  bracts 1 or 2, up to 2 mm long, one at the middle of  the peduncle, the other very near to the raceme, pubescentlinear, fugacious; floral bract 0.5 mm long,  pubescent, clavate, fugacious; pedicels 0.7-1 mm  long, glabrous; flowers white, becoming orange when  dry; racemes 0.7-1(2.2) cm long at anthesis. Legume  (3.7)4 × 0.7 × 0.2 cm, flat, straight, dehiscent; valves  membranaceous, conspicuously reticulate, glabrousacute at the base and apex; stipe 0.6 mm long; beak  present, 2 mm long. Seeds 3-3.5 × 3-3.3 × 2.1-2.3 mm.

Distribution

Mexico: Chiapas, Colima, Durango,  Guerrero, Jalisco, Edo. Mexico, Michoacan, Morelos,  Nayarit, Puebla, Sinaloa and Sonora.

Additional info

Habitat. Seasonally dry forest, dry scrubland,  scrub, Quercus and mixed Quercus-Pine forest and  less frequently in humid mesophyllous forest; on  sandy soils, but prefers limestone. Alt. 50-1950 m. 

Key to varieties of Acaciella painteri
 
1. Twigs, rachises and petioles with short, sparse strigulose  hairs, sometimes hirsute, but not yellow-hirsute; restricted to  Jalisco and Nayarit states in SW Mexico ... var. painteri 
1. Twigs glabrous or very sparsely puberulous; plants with a  wider distribution in Central and Southwest Mexico ... var. houghii 

Flowering time

Flowering all year, fruiting from August- March.

Representative specimens

MEXICO:

Colima:

Durango:

Guerrero:

Jalisco:

Michoacán:

Morelos:

Nayarit:

Puebla:

Sinaloa:

Sonora:

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