Name
Acaciella igualensis Britton & Rose, N. Amer. Fl. 23: 102. 1928.
Rico Arce & BachmanAnales del Jardín Botánico de MadridVol. 63(2): 189-244July-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 pinnae; pinnae (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:
- a 3 km al E de Los Asmales, 2-IX-1979, Magallanes, J.A.S. 1814 (MEXU).
Guerrero:
- 2 km al NW de Amatitlán, 17º 52'53'' N, 99º 46'09'' W, 1140 m, 14-IX-1994, Calonico S., J. 1206 (MEXU);
- 2 km al SE de San Miguel, 1000 m, 5-IX-1996, Cruz Durán, R. 944 (MEXU).
Jalisco:
- Barranca de Huentitán, al comenzar el descenso, 20º 45' N, 103º 19' W, 8-IX-1988, Reynoso, J.J. 154 (MEXU).
México:
- Temascaltepec, 19º 02' N, 100º 03' W, 1450 m, 11-V-1932, Hinton, G. B. 2500 (G, K);
- Calera, 19º 00' N, 100º 00' W, 7-IV-1935, Hinton, G. B. 8016 (K, LL).
Michoacán:
- Tiquicheo, 10 km al S de Tierra Caliente, 18º 53' N, 100º 44' W, 8- VII-1973, González Medrano 6158 (MEXU);
- 10 km al NW de La Erendira, cerca de Paso de Nuñez, camino a Caracuaro, 23-IX- 1977, Soto, J.C. 322 (MEXU).
Morelos:
- Alpuyeca, 18º 44' N, 99º 16' W, 3500 m, 17-VIII-1949, Atmar, G.L. 70 (MEXU);
- Xochitepec, 18º 47' N, 99º 14' W, 1110 m, 1-XI-1923, Lyonnet 1076 (MEXU).
Puebla:
- Jolalpán, ranchería de Xochitepec, VII-1984, Moreno Macías, E. 49 (MEXU).