Lysiloma acapulcense (Kunth) Benth.

Lysiloma pedicellata Britton & Rose, sp. nov
A tree, S-IO m. high, the twigs, petioles, leaf-rachis and peduncles loosely pilose, orglabrate, the bark dark brown. Stipules triangular-ovate, 1.5-2 cm. long, 1 cm. wide, glabrous, acuminate; glands elevated, rounded, borne on the short petiole just below the lower pair of pinnae, and between the upper pairs; pinnae S-16 pairs; rachilla pilose; leaflets 30-40 pairs, linear, obtuse, glabrous or ciliolate, 5-6 mm. long, delicateljpiimately veined, about equally green on both sides; spike-like racemes axillary, solitary, densely flowered, 3-4 cm. long, the slender peduncles 2-4 cm. long; pedicels 0.5-1 mm. long; calyx about 1.5 mm. long, short-pilose; corolla about 2.5 mm. long, somewhat pubescent; stamens about 3 times as long as the corolla.
Arroyo del Tacictapa, San Ignacio, Sinaloa, May 13, 1918, Monies and Salazar 34S.

Lysiloma purpusii Britton & Rose, sp. nov
Twigs, petioles, leaf-rachis antl peduncles pilose. Petioles 1.5-3 cm. long, bearing a depresst-d gland; stipules narrow; pinnae 12-20 pairs; leaflets 25-40 pairs, linear, 4—8 mm. long, glabrous, obtuse, delicately pinnately veined when young, the midvein distinct but the lateral venation obscure when old; peduncles slender, 1.5-3 cm. long; spike-like racemes dense, 2-2.5 cm. long; pedicels about I mm. long; flowers densely short-pubescent; calyx about 1.5 mm. long; corolla about 2 mm. long; stamens 6-7 mm. long; legume narrowly oblong, 14 cm. long, 3 cm. wide, glabrous, its base obtuse, its stout stipe 8 mm. long.
Rocky banks of creeks, Monserrate, Chiapas, 1925, Pur pus 102S3.

Lysiloma platycarpa Britton & Rose, sp. nov
A tree, 12-15 m. high, the twigs, petioles and leaf-rachis pilose. Petioles stout, 1-1.5 cm. long; glands depressed or slightly elevated, large, borne on the petiole at or below the lower pair of pinnae, and between the upper pairs; pinnae 10-12 pairs, the rachilla pilose; leaflets 25-30 pairs, linear, about 4 mm. long, glabrous but ciliolate, straight or slightly curved, obtuse, the venation obscure; legume oblong, about 15 cm. long, and 6.5 cm. wide, glabrous, its base rounded, its stout stipe about 6 mm. long.
Moate de la Gloria, Michoacan, 1060 m. alt., March 23, 1898, Langlasse 69.

Lysiloma durangensis Britton & Rose, sp. nov
Twigs, petioles and leaf-rachis pilose. Petioles 1-2 cm. long; glands much elevated, rounded, 1-1.5 mm. high and about as broad as high, pubescent, borne near the end of the petiole and between the upper pair of pinnae; pinnae 4-6 pairs; leaflets 16-26 pairs, linearlanceolate, obtuse, 3-5 mm. long, pubescent on both sides, the venation obscure; peduncles 3-5 cm. long, pilose; legume narrowly oblong, 6-8 cm. long, about 1.8 cm. wide, glabrous, pointed, the base cuneate, the stipe about 1 cm. long.
La Bijada, Tamazula, Durango, Ortega 4410.

Lysiloma desmostachys Benth. Lond. Journ. Bot. 3: 84. 1844
Acacia desmostachys Benth. PI. Ilartw. 13. 1839.
A tree, up to 15 m. high, the twigs, petioles and leaf-rachis and peduncles pilose. Stipules
caducous or wanting; glands more or less elevated, borne on the petiole and between the
upper pair of pinnae; pinnae 7-15 pairs; leaflets 40-60 pairs, glabrous, ciliolate, or when young
appressed-pubescent, linear or linear-oblong, obtuse or acutish, 3-5 mm. long, the midvein
nearly central, the lateral venation obscure; spikes solitary or clustered, densely flowered;
peduncles slender, 1-2.5 cm. long; flowers sessile; calyx finely pubescent, 1-1.5 mm. long;
corolla pubescent, about twice as long as the calyx ; stamens about 3 times as long as the corolla;
legume oblong, glabrous, 12-20 cm. long, 3-3.7 cm. wide, its base narrowed, its stipe 8-10 mm.
long.
Type locality: Le6n, Guanajuato.
Distribution: Veracruz to Guanajuato, Jalisco, Guatemala and El Salvador.

Lysiloma cuneata Britton & Rose, sp. nov
Twigs, petioles and leaf-rachis densely pilose. Petioles stout, about 1.5 cm. long; glands orbicular, flat, borne at the end of the petiole and between the upper pairs of pinnae; pinnae 9 or 10 pairs, the rachilla pilose; leaflets 30-40 pairs, linear, 5-6 mm. long, glabrous, slightly curved, obtuse, the midvein nearly central, the lateral venation wholly obscure; legume oblong, glabrous, 16-19 cm. long, 4-4.5 cm. wide, its stipe about I cm. long.
Balboa, Sinaloa, January, 1923, Ortega 4991.

Lysiloma jorullensis Britton & Rose, sp. no v Twigs, petioles, leaf-rachis and peduncles densely tomentose. Petioles 2-3
bearing a conic gland about 2 mm. high; 6
cm. long, pinnae 15-20 pairs; leaflets about 50 pairs, linear, obtuse, 5-6 mm. long, pubescent and ciliate, the base subtruncate, the midvein nearly central; peduncles slender, 3-4 cm. long; flowers in spikes 6-7 cm. long, very nearly sessile; calyx campanulate, densely short-pilose, 1.5-2 cm. long, its teeth short, acute; corolla glabrate, about 4 mm. long; legume broadly linear, 15-25 cm. long, 2.7 cm. wide, narrowed at the base, densely and finely puberulent.
Volcan de Jorullo, Michoac&n, March, 1903, Nelson 6956.