Leucaena pallida Britton & Rose

Leucaena oaxacana Britton & Rose, sp. nov
Twigs, petioles and rachis sparingly puberulent or glabrous. Petioles 1-2 cm. long, bearing a depressed gland 2-2.5 mm. long, at or below the lowest pair of pinnae; pinnae 10-24 pairs, short-stalked; leaflets 20-50 pairs, narrowly linear, sharply acute, densely papillate, ciliolate, 4—6.5 mm. long, 1-1.5 mm. wide, the faint midvein somewhat excentric; peduncles 2-4 together, glabrous, 1.5-2.5 cm. long; involucre approximate to the head, its bracts spreading; bractlets orbicular, ciliate, peltate; calyx 1.5 mm. long, its lobes puberulent; petals 3 mm. long; stamens about 5 mm. long; anthers glabrous; legume 8-9 cm. long, 11-14 mm. wide, glabrous, its rounded apex minutely tipped, its base short-cuneate, its stipe about 7 mm. long.
Near the city of Oaxaca, Oaxaca, June 16-21, 1899, Rose & Hough 4648.

Leucaena dugesiana Britton & Rose, sp. nov
A shrub, the twigs, petioles and rachis minutely puberulent. Petiolar gland large, depressed, cupulate, oblong, 3-4 mm. long, borne just below the lower pair of pinnae; pinnae 12-16 pairs, short-stalked; leaflets 30-50 pairs, with scanty appressed pubescence, but soon glabrate, abruptly acute, short-ciliate, 5-S mm. long, thickish; peduncles axillary, 1-2 cm. long, in clusters of 2-4, puberulent and with sessile red glands, angled; flowers sessile; bractlets orbicular, glabrous; calyx glabrous; petals 3 mm. long, glabrous; legume 7-10 cm. long, 10-12 mm. broad, glabrous, shining, cuneate at base.
Guanajuato. Type from Guanajuato, July 11, 1899, Rose & Hough 4S41; collected also by A. Duges in 1880.

Leucaena paniculata Britton & Rose, sp. nov
A tree, glabrous or nearly so throughout, the twigs subterete. Petioles stout, 1-2 cm. long, bearing a large, nearly flat gland below the lowei pair of pinnae; rachis slender, bearing smaller glands between the two or three upper pairs of pinnae ; pinnae 6-20 pairs, very nearly sessile; leaflets 25-45 pairs, linear, acute, glabrous or ciliolate, 4-5 mm. long, the midvein somewhat excentric; heads slender-peduncled in a terminal thyrsus; peduncles 1-1.5 cm. long; involucre small, appressed to the head; bractlets glabrate; flowers sessile; calyx glabrous, about 2.5 mm. long; petals a little longer than the calyx, glabrous; stamens about twice as long as the petals; anthers pilose; legume narrowly linear, glabrous, 20 cm. long, 1.3 cm. wide, pointed, short-stipitate, the seeds obliquely transverse.
Morelos; Jalisco; Oaxaca. Type frojp near Cuemavaca, Morelos, August 15, 1906, i?oie & Rose 11090.

Leucaena pallida Britton & Rose, sp. nov
Twigs, petioles and rachis minutely puberulent. Petiolar gland depressed, cupulate, suborbicular, 3-3.5 mm. broad, borne just below the lower pair of leaflets; pinnae 10-16 pairs, short-stalked; leaflets 20-60 pairs, appressed-pubescent on both sides, those of some (upper) leaves linear, acute, 5-9 mm. long, the midvein excentric, those of some (lower) leaves linearoblong, obtuse, only 2 mm. long; peduncles axillary, puberulent, 1.5-2.5 cm. long; involucre small, appressed; bractlets orbicular, pubescent; flowers sessile; calj'x-lobes puberulent; petals about 4 mm. long, glabrous; stamens 8-9 mm. long; legume linear, glabrous, apiculate, 12-16 cm. long, 12-14 mm. wide, stipitate, the base cuneate. Near Huejuquilla, Jalisco, /. N. Rose 2569.

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