Leucaena macrophylla subsp. macrophylla

Leucaena nelsonii Britton & Rose, sp. nov
, Twigs and foliage densely pubescent. Petioles 1.5-2 cm. long, bearing a large subconic gland just below the lowest pair of pinnae; pinnae 2 pairs, slender-stalked; leaflets 3 or 4 pairs, oblong-lanceolate or ovate-lanceolate, 3-6 cm. long, acute or acuminate, densely pubescent on both sides, the excurrent rachilla bearing a small subconic gland below the upper pair; peduncles shorter than the diameter of the flower-head or as long; involucre subtending the head, its bracts spreading; bractlets orbicular, ciliolate.
Between San Marcos and Copala, Guerrero, February S, 1895, Nelson 2286.

Leucaena houghii Britton & Rose, sp. nov
A shrub, the twigs and petioles glabrous. Pirmae 1 to 2 pairs; petiole 1-2 cm. long, bearing a large somewhat elevated gland; rachilla bearing a large orbicular gland at the upper pair of leaflets; leaflets 1-3 pairs, pubescent when very young, soon glabrous, elliptic to broadly ovate, finely reticulate-veined, 4-5 cm. long, the apex acute, obtuse or rounded; legume 10-12 cm. long, 15-17 mm. wide, glabrous, tapering at base into a slender stipe, about 1 cm. long.
Cuemavaca, Morelos, May 27-30, 1899, Rose & Hough 4362, type; Monte d'Inguaran, Michoacan or Guerrero, Langlasse 12.

Leucaena macrocarpa Rose, Contr. U. S. Nat. Herb 1: 327. 1895.
A shrub, or a small tree about 8 m. high, the twigs, foliage and peduncles glabrous. Petioles 1-4 cm. long, the gland oblong, depressed, borne below the lower pinnae; pinnae mostly 2 pairs, slender-stalked; leaflets 2 or 3 pairs, ovate to oval or ovate-lanceolate, 3-6 cm. long, chartaceous, acute or acuminate, reticulateveined, bright green and glabrous above, paler and glabrous, or pubescent on the veins beneath; peduncles solitary or several together, 0.5-2 cm. long, in a terminal raceme or thyrsus; involucre appressed; calyx about 1.5 mm. long; petals a little longer than the calyx; stamens about 2.5 mm. long; legume broadly linear, glabrous, about 11 cm. long, 1.8 cm. wide, acute at each end, its slender stipe about 1.5 cm. long.
Type locality: Rio Blanco, Jalisco.
Distribution: Jalisco; Guerrero.