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Name

Acaciella igualensis Britton & Rose, N. Amer. Fl.  23: 102. 1928.

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

Synonymy and types

Acacia igualensis (Britton & Rose) Bullock, Bull. Mics.  Inform. Kew 1939: 1. 1939. Type: Mexico: Guerrero, near Iguala, 11 Aug. 1905,  Rose, Painter & Rose 9351 (holotype, NY!; isotypes,  K!, US). 

Acaciella holwayi Britton & Rose, N. Amer. Fl. 23:  103. 1928. Type: Mexico: Morelos, Yautepec, E. W. D. Holway  5237, 24 Oct. 1903 (holotype, US-472612; isotype,  NY!).

Formal description

Shrub to 3 m tall, yellow-hirsute throughout. Stipules  4-5 × 1 mm long, fugacious. Leaves 10-16(22) cm  long; petiole 1.5-2 cm long, cylindric, hirsute; rachis  5.5-12 cm long, hirsute, with 9-12 (15) pairs of pinnaepinnae (2.2)4-7.5 cm long; paraphyllidia 0.5 mm long;  leaflets (27)34-55 pairs per pinna, 3.5-5.5 × 1.5 mm,  linear-oblong, base obliquely truncate, apex acute, venation  brochidodromous, glabrous on both surfaces,  margin long-ciliate, papyraceous. Inflorescences consisting  of clusters of 2-4 capitulum-like racemes, on  terminal axis to 12.5(32) cm long, yellow-hirsute; peduncles  0.8 cm long, sparsely hirsute, without pearl  glands; inflorescence bracts two, one at the peduncle  base, 1.2-2 mm long, linear, the other near the capitulum- like raceme, 1 mm long, broadly elliptic, pubescent  on the margins, fugacious; floral bract 0.5 mm  long, glabrous, broadly obovate, fugacious; pedicels  0.7-0.9 mm long, glabrous; flowers white, capitulumlike  racemes 1-1.2 cm in diam. at anthesis. Calyx 0.5  mm long, 5-lobed, the lobes less than ¼ the length of  the whole calyx, glabrous. Corolla to 2 mm long, 5-  lobed, the lobes half the whole corolla length,  glabrous. Stamens c. 4 mm long. Ovary 1 mm long,  glabrous, short-stipitate, the stipe shorter than the  ovary; basal nectary 0.5 mm high. Legume 5.5-6 × 0.9-  1 × 0.2 cm, flat, straight, dehiscent along both sutures;  valves chartaceous, conspicuously reticulate,  glabrous, acute at the base and apex; stipe 0.5 cm  long; beak present, 2 mm long. Seeds 8 per fruit, almost  spherical, 3.5-4 × 4 × 1.5-2 mm.

Distribution

Mexico central: Guerrero, Jalisco,  Edo. Mexico, Michoacan, Morelos, Nayarit, and  Puebla.

Additional info

Habitat. Most often found in Quercus forest, less  frequent in low deciduous forest and savanna-like  vegetation. Alt. 1100-1900 m.

Flowering time

Flowering from August to October,  fruiting from July to November.  Vernacular name. Timbre. 

Representative specimens

MEXICO:

Colima:

Guerrero:

Jalisco:

México:

Michoacán:

Morelos:

Puebla:

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