460 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
genus, though there can be no doubt as to its belonging to the P. ligustrinum 
group. 
6, Pithecollobium calostachys Standl. Contr. U. S. Nat. Herb, 20: 190. 1919. 
Tamaulipas to Chiapas, Mexico; type (Palmer 307) collected near Tampico, 
Tamaulipas. 
7. Pithecollobium macrosiphon Standl. Contr. U. S. Nat. Herb. 20: 191. 1919. 
Based upon Nelson 3398, from Chiapas, Mexico. 
8. Pithecollobium lanceolatum (Humb. & Bonpl.) Benth, Lond. Journ. Bot. 5: 
105. 1846. 
Inga lanceolata Humb. & Bonpl.; Willd. Sp. Pl. 4: 1005. 1806. 
Mimosa lanceolata Poir, in Lam. Enecycl. Suppl, 1: 87. 1810. 
A middle-sized tree, with rounded crown, the trunk short, the bark rimose 
or smooth, grayish or brownish, often white-lenticellate on the branchlets. 
Leaves bipinnate, almost entirely glabrous, the basal stipules spinescent, 
straight, acute, 0.8 to 2.1 cm. long, rarely obsolete; petioles canaliculate, the 
main one 1.3 to 4 cm. long, with a small discoid sessile apical gland; pinnae 
unijugate, the interpetiolar stipule subulate, 1 to 3 mm. long, the secondary 
petioles 0.5 to 2 cm. long, the apical gland small and often obsolete; leaflets 
unijugate, coriaceous, sessile, oblique-ovate or lanceolate, broadly obtuse or 
subacuminate at the apex, 2 to 7.5 long, 1 to 4 cm. broad, the inner half cuneate 
and the outer half broadly rounded at the base, the venation more or less 
conspicuous on both faces. 
Racemes paniculate at the ends of the branchlets, the rachis 4 to 12 cm. long, 
slender, grayish or brownish pubescent; bracts lanceolate, acute, hairy, often 
3 mm. long caducous; bractlets very small, scaly, hairy; flowers 12 to 20 mm. 
long; calyx 3 mm. long (sometimes less), grayish-pubescent; corolla tubular- 
campanulate, 5 to 6 mm. long, grayish-pubescent, the lobes acute, about 1 mm. 
long; stamen tube included or more or less exserted; ovary grayish-hairy, 
sessile or stipitate, the style 10 to 17 mm. long, glabrous or sparsely villous. 
Legume torulose, glabrous, 8 to 12-seeded, dehiscent, 10 to 14 cm. long, the 
valves about 1 cm. broad; seeds small, black. 
The type of this species is said to be from Nova Barcelona, which now com- 
prises the States of Anzoategui and Sucre, Venezuela. The above description 
is based mainly upon Nelson 4314, 
SPECIMENS EXAMINED: 
Mexico: Mazatlin, Sinaloa, flowers, April 1, 1910, Rose, Standley & Russell 
18852. Villa Uni6n, Sinaloa, flowers, April 2, 1910, Rose, Standley 
& Russell 18950. Rosario, Sinaloa, flowers, Rose 3162, Rose, Standley 
& Russell 14520. San Blas, Tepic, flowers, April 20, 1897, and June 
6, 1897, Maltby 17, Nelson 4347. San Luis Potosi to Tampico, flowers, 
1878-1879, Palmer 1061. Tampico, flowers, April 27, 1897, Pringle 
7681. Marfa Magdalena Island, flowers, May 26, 1897, Nelson 4814, — 
Maltby 104. Vicinity of Gémez Farias, Tamaulipas, flowers, April 
13-21, 1907, Palmer 282, 
Costa Rica: Vicinity of Nicoya, Province of Guanacaste, flowers, April, 
1900, Tonduz (Inst. Fis. Geogr. Costa Rica, no. 13892). 
VENEZUELA: Cardenas, Siquire Valley, Miranda, altitude about 500 meters, 
flowers, March 20, 1913, Pitticr 6002. La Marquesa, near Guatire, 
Miranda, altitude 320 meters, flowers, May 12, 1918, Pittier 7841. 
In the straight slender spines, the general shape of the leaves, whose vena- 
tion is prominent on the upper face, and the panicled inflorescences at the ends 
of the branchlets, these specimens agree with Willdenow’s description of P. 
