184 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
a rather wide range, as shown by the following specimens in the National 
Herbarium. 
Srnatoa: Guadalupe, 1910, Rose, Standley & Russell 14676. Culiacién, 
1910, Rose, Standley & Russell 14846. San Blas, 1910, Rose, Standley 
& Russell 18210. Fuerte, 1910, Rose, Standley & Russell 13482. 
DurANGO: Without locality, August 15, 1897, Rose. 
JALIsco: Between Bolafios and Guadalajara, September 19, 1897, Rose. 
GUERRERO: Paso de las Vacas, 1903, Nelson 6978. 
CorimMa: Colima, 1897, Palmer 117. 
NEW MIMOSACEAE FROM MEXICO. 
Few, if any, families of plants are represented in Mexico by a 
larger number of woody species than the Mimosaceae. Their study 
is made difficult by the fact that there are no monographic accounts 
available except those published by Bentham many years ago. 
Although Bentham’s work is almost unrivaled in accuracy and 
lucidity, recent botanical explorations in Mexico have shown that 
his monographs are now too incomplete to be generally useful. 
There is a recent account of the genus Mimosa, by Robinson,’ but 
there is no adequate literature covering the other groups. Eight new 
species of Acacia, one of Calliandra, two of Leucaena, and four of 
Pithecollobium are described below. 
Acacia polypodioides Standl., sp. nov. 
Stems slender, brown or purplish, copiously hirsute with slender stiff hairs, 
also puberulent and furnished with numerous minute sessile glands, unarmed; 
petioles 1.5 to 2.5 em. long, hirsute and puberulent, eglandular, the pinnae 
4 to 7 pairs, 2.5 to 6 cm. long; leaflets 12 to 25 pairs, oblong, 2.5 to 6 mm. long, 
1 to 2.5 mm. wide, divaricate or ascending, obliquely truncate at the base, 
obtuse or rounded at the apex, chartaceous, dark green above, sublustrous, 
densely puberulent, paler beneath, densely puberulent with curved hairs or 
glabrate, the costa prominent beneath, the lateral nerves also usually prominu- 
lous, the margin revolute or subrevolute; flowers capitate, pedicellate, the 
heads axillary or short-racemose, the peduncles 1 to 1.5 cm. long, hirsute or 
puberulent, bracteate above the middle; calyx 0.8 mm. long, broadly campanu- 
late, obscurely lobate, minutely pilose or puberulent; corolla 3 times as long 
as the calyx or longer, the lobes oblong, acute, strigose; stamens long-exserted ; 
fruit long-stipitate, flat, 3.5 to 5.5 em. long, 7 to 10 mm. wide, acute or abruptly 
short-decurrent at the base, rounded at the apex and rostrate, densely puberu- 
lent, the valves very thin. 
Type in the U. S. National Herbarium, no. 470796, collected at Chiapa, 
Chiapas, Mexico, May 18, 1904, by E. A. Goldman (no. 1001). 
The following additional collections belong here: 
Oaxaca: Vicinity of San Juan Guichicovi, alt. 135 to 450 meters, Nelson 
2726. Las Pilas (Cerro Espino), alt. 400 meters, Reko 3612, 3755. 
Nicaracua: Granada, Baker 2325. 
Acacia polypodioides is a member of Bentham’s series Filicinae, and is 
related to A. filicioides (Cav.) Trel., A. angustissima (Mill.) Kuntze, and 
allied species. It is distinguished by the pubescent corolla and the peculiar 
*Proc. Amer, Acad. 33: 305-831. 1898. 
