Bursera multijuga Engl.

Elaphrium multijugum (Engler) Rose
Bursera multijuga Engler, in DC. Monog. Phan. 4: 42. 1883. Terebinlhus multijuga Rose, Contr. U. S. Nat. Herb. 10 : 121. 1906.
Leaves clustered at the tops of the branches, glabrous ; leaflets 11-35, 2-4 cm. long, elongate-lanceolate, somewhat serrate ; panicle 5-6 times shorter than the leaves ; calyx-lobes 1.5 mm. long ; petals 5 mm. long.
Type locality : Colima.
Distribution : Known only from the type material.

Elaphrium rubrum Rose
Terebinthus rubra Rose, Contr. U. S. Nat. Herb. 10 : 121. 1906.
A small tree or shrub with a smooth red trunk, the bark peeling off in broad sheets ; young branches and leaves glabrous ; leaflets 5-7 pairs, lanceolate, rounded at base, acuminate, serrate below, entire above, paler beneath, 4 cm. long or less ; flowers not seen, but inflorescence apparently open ; fruiting peduncle 1-2 cm. long, bearing 2-4 fruits ; drupes obovate, somewhat 3-angled.
Type locality : Near Colomas, Sinaloa. Distribution : Foothills of Sinaloa.

Elaphrium pringlei (S. Wats.) Rose
Bursera Pringlei S. Wats. Proc. Am. Acad. 25 : 145. 1S90. Terebinthus Pringlei Rose, Contr. U. S. Nat. Herb. 10 : 121. 1906.
A small tree, glabrous throughout ; bark of trunk red, easily peeling off in thin sheets ; branches dark-brown ; leaves once-pinnate, 5-15 cm. long; rachis narrowly winged ; leaflets 25, linear-lanceolate, acuminate, 2-4 cm. long, serrate, thinnish, not at all rugose ; raceme short, few-flowered ; pedicels 6-10 mm. long ; calyx-lobes ovate, 1 mm. long ; petals 4 mm. long, glabrous ; drupes globose, 4-6 mm. in diameter.
Type locality : Rocky bluff of the Rio Grande de Santiago near Guadalajara, Jalisco. Distribution : Hot barrancas of Jalisco.