Bursera linanoe (La Llave) Rzed., Calderón & Medina

Elaphrium delpechianum (Poisson) Rose
Bursera Delpechiana Poisson ; Engler, in DC. Monog. Phan. 4: 53. 1883. Terebinlhus Delpechiana Rose, Contr. U. S. Nat. Herb. 10 : 119. 1906.
Probably a tree ; leaves 5-6 cm. long, clustered at the ends of the branches; rachis narrowly winged; leaflets 7, elliptic, acute at both ends, crenate-serrate, 1.5-2 cm. long, 8-10 mm. broad; panicle as long as the leaves, short-pilose; pedicels slender, 3-4 mm. long; calyx-lobes short-deltoid, 1 mm. long; petals oblong, 5 mm. long, with scanty long hairs ; drupes ovoid, glabrous, about 1 cm. long.
Type locality : Mexico.
Distribution: Known only from the type collection.

Elaphrium longipedunculatum Rose, sp. nov A tree ; bark of second-year branches dark-brown, smooth; rachis of leaves narrowly winged, entire; leaflets 5-7, ovate to short-oblong, 1.5-4 cm. long, acute, nearly glabrous above, somewhat hairy beneath, crenate ; peduncles flattened, 3-4 cm. long, bearing 2 or 3 fruits; pedicels 10-12 mm. long, somewhat enlarged above; drupes somewhat flattened, 10 mm. long, glabrous ; exocarp splitting into 2 valves.
Type collected near Almoloyas, Oaxaca September, 1906,/. N. Rose &J. S. Rose 11282 (U. S. Nat. Herb. no. 454073).

Elaphrium aloexylon Schiede, Linnaea 17 : 252. 1843
? Atnyris Linaloe Llave, Reg. Trim. 1 : 356. 2.
Bursera Aloexylon Engler, in DC. Monog. Phan. 4: 52. 1883.
Tercbinlhus Aloexylon W. F. Wight; Rose, Contr. U. S. Nat. Herb. 10: 118. 1906.
Young branches glabrous ; leaves pinnate ; rachis narrowly winged ; leaflets 5-7, membranaceous, obtuse, coarsely crenate, above shortly pilose and shining, tomentose beneath, 1.5-2 cm. long; inflorescence shorter than the leaves, 3 cm. long; fruiting pedicels 1-1.5 cm. long; drupes 6-7 mm. long.
Type locality ; Real de Huautla [Cuautla], Morelos. Distribution : Vera Cruz (?) to Morelos.