Haujillo

Havardia nelsonii Britton & Rose, sp. nov
A shrub or tree, the twigs puberulent, the old branches glabrate and brownish. Stipular spines black, flattened, 15 mm. long, or shorter; petiole slender, 1-1,5 cm. long, puberulent, bearing a small oblong sessile gland; pinnae 3-6 pairs; leaflets 10-15 pairs, 7-10 mm. long, oblong, obtuse or acutish, very pale, glabrous; peduncles 1-2 cm. long, puberulent, axillary, solitary, or sometimes in fascicles of 3 or 4; calyx cup-shaped, minute, 1 mm. long or less, puberulent; corolla .^ mm. long, glabrous; stamens numerous, 8 mm. long, the tube short, included.
Between San Geronimo and La Venta, Oaxaca, July 13, 1898, E. W. Nelson 2776.

Havardia pallens (Benth.) Britton & Rose
Calliandra pallens Benth. Lend. Journ. Bot. 5: 102. 1845. Pilhecolobium brevifolium Benth.; A. Gray. PI. Wright. 1: 67. 1852. Acacia nueciana Buckley, Proc. Acad. Phila. 1861: 453. 1862. Feuilleea brevifolia Kuntze, Rev. Gen. PI. 187. 1891. Zygia brevifolia Sudw. Bull. U. S. Dept. Agr. For. 14: 248. 1897. Havardia brevifolia Small, Bull. N. Y. Bot. Gard. 2: 92. 1901.
A tree or shrub, sometimes 10 m. high, the twigs puberulent, the stipular spines, when present, slender and often 10 mm. long. Petiole and rachis puberulent; petiole bearing a small cup-shaped gland near the middle; pinnae 3-6 pairs, opposite or alternate;' leaflets 10-20 pairs, oblong, 3-7 mm. long, obtuse or acutish, puberulent on both sides; inflorescence paniculate, pubescent; peduncles 1-1.5 cm. long; calyx minute, 1 mm. long, pubescent; corolla 6-7 mm. long, puberulent; stamens 12-15 mm. long, the tube shorter than the corolla; legume linear-oblong, 7-10 cm. long, stipitate, acuminate.
Type locality: Zimapan, Hidalgo.
Distribution: Southeastern Texas and Tamaulipas. south to northern Hidalgo.