Name
Acaciella lemmonii (Rose) Britton & Rose, N. Amer. Fl. 23: 103. 1928 ["lemmoni"].
Rico Arce & BachmanAnales del Jardín Botánico de MadridVol. 63(2): 189-244July-December 2006
Synonymy and types
Acacia lemmoni Rose, Contr. U.S. Nat. Herb. 12: 409. 1909. Acacia angustissima subsp. lemmonii (Rose) Wiggins, Contr. Dudl. Herb. 3: 230. 1942. Type: United States: Arizona, Huachuca Mountains, Sep. 1852, J.G. Lemmon s.n. (holotype, US-41089!; isotype, G!). Acaciella shrevei Britton & Rose, N. Amer. Fl. 23: 105. 1928.
Acacia shrevei (Britton & Rose) Tidestr., Proc. Biol. Soc. Wash. 48: 40. 1935. Acacia angustissima var. shrevei (Britton & Rose) Isely, Sida (6): 371. 1969. Acacia hirta var. shrevei (Britton & Rose) Kearney & Peebles, J. Wash. Acad. Sci. 29: 482. 1939. Type: United States: Arizona, Huachuca Mountains, 26 Sep. 1916, F. Shreve 5064 (holotype, NY!; isotype, US).
Formal description
Shrub to 3 m tall; twigs hirsute-pubescent. Stipules lanceolate, 3-3.5 mm long, fugacious. Leaves 11-13.5 cm long; petiole 2.5-3.5 cm long, terete, hirsute-pubescent; rachis 6-9.5 cm long, hirsute-pubescent, 5-10 pairs of pinnae; pinnae 2-4 cm long; paraphyllidia 0.75-1 mm long; leaflets (15)18-20 pairs per pinna, 6-10 × 1.5 mm, oblong, base truncate, apex acute, venation inconspicuously brochidodromous, glabrous, margins sparsely and shortly ciliate, membranaceous. Inflorescences consisting of clusters of 2- 3 axillary capitulum-like racemes; peduncles up to 1.2 cm long; hirsute-pubescent, whithout pearl glands; inflorescence bract one, near to the head, 1.5 mm long, glabrous, fugacious; floral bract less than 1 mm long, glabrous, clavate, fugacious; pedicels 0.5 mm long, glabrous; flowers white, becoming yellow-cream when dry, in capitulum-like racemes to 1.3 mm in diam. at anthesis. Calyx less than 0.5 mm long, 5- lobed, the lobes less than ¼ the length of the whole calyx, glabrous. Corolla 1.5 mm long, 5-lobed, the lobes to more than half the whole corolla length, glabrous. Stamens 6 mm long. Ovary 1 mm long, glabrous, short-stipitate, the stipe shorter than the ovary; basal nectary 0.5-0.7 mm high. Legume 4-6 × 0.8-1 × 0.2-0.3 cm, flat, straight; valves chartaceous, conspicuously reticulate-veined, hirsute, with hairs becoming sparser when fruit mature, rounded at the base, acute at the apex; stipe up to 1.2 cm long; beak absent. Seeds (6)8- 10(12) per fruit, almost spherical, 4.5 × 3.5-4 × 2 mm.
Distribution
Southern United States: Arizona and Texas; Mexico north: Chihuahua, Nuevo Leon, Sinaloa and Sonora.
Additional info
Habitat. Dry scrub. Alt. 900-1600 m.
Flowering time
Flowering May to September, fruiting from June to October.
Representative specimens
MEXICO:
Nuevo León:
- 24 km al S de Linares, 1400 m, 25-IX- 1986, Estrada, A.E. 683 (MEXU).
Sinaloa:
- Arroyo, Potrerillo, 25º 14' N, 107º 22' W, 1100 m, 24-VI-1982, Hernández M., R. 7406 (IBUG, MEXU);
- 9 km, al E de Agua Caliente, 26º 49' N, 108º 22' W, 600 m, 6-X-1985, Tenorio, P. 10259 (MEXU).
Sonora:
- Los Pozos drainage S into Rio, 29º 32' N, 108º 53' W, 1000 m, 25-IX- 1991, Joyal, E. 1765 (TEX);
- Concordia, 3 km al NE de Loberas, 30º 36' N, 111º 03' W, 1922 m, 26-VI-1982, Tenorio, P. 611 (IBUG, MEXU);
- Janos, Border of Chihuahua and Sonora, 30º 15' N, 110º 03' W, 1600 m, 26-VIII-1939, White, S.S. 2555 (MEXU).
USA:
Arizona:
- Deer Canyon, 31º 53' N, 109º 14' W, 600 m, 2-IX- 1906, Blumer, J.C. 1236 (K, MEXU);
- 21 miles from junction of highway 81-83, along highway 83, 1-V-1949, Tharp 52-145 (MEXU).