Pari 3, 1911] BURSERACEAE 253 



54. Elaphrium biflorum Rose. 



Terebinlhus biflora Rose, Contr. CT. S. Nat. Herb. 10 : 119. 1906. 



A tree, 2-5 meters high with many stunted branches ; leaves on very short petioles 

 (8 mm. long); leaflets always 3, small, 6-20 mm. long, ovate to obovate, acute or obtuse, 

 more or less cuneate at base, crenate, slightly pubescent on both sides ; fruiting peduncles 

 slender, 12-20 mm. long; pedicels 4 mm. long; drupes usually in pairs, 8 mm. long, 

 glabrous. 



Type locality: Near Tehuacan, Puebla. 



Distribution : Puebla. 



55. Elaphrium mexicanum (Engler) Rose. 



Bursera mexicana Engler, in DC. Monog. Phan. 4 : 51. 1883. 



Terebinlhus mexicana W. F. Wight ; Rose, Contr. U. S. Nat. Herb. 10 : 120. 1906. 



Probably a tree ; leaves clustered at the ends of the branches, pinnate ; leaflets 11-13, 

 elliptic to oblong-elliptic, 2-2.5 cm. long, 6-10 mm. broad, thin, membranaceous, serrate, 

 in age glabrous, shining above ; inflorescence paniculate, 6-8 cm. long ; calyx-lobes linear- 

 lanceolate, acute, 2 mm. long; petals linear-lanceolate, acute, 4 mm. long; ovary and fruit 

 glabrous, the latter 7 mm. long. 



Type locality : San Luis [Potosi]. 



Distribution : From San Luis Potosi to Vera Cruz and west to Colima. 



56. Elaphrium brachypodum Rose, sp. no v. 



A shrub or small tree ; bark of trunk peeling off in large thin yellow sheets ; young 

 branches pubescent ; leaves clustered at the ends of short branches or more or less scattered ; 

 rachis of leaf narrowly winged, pubescent ; leaflets 9-13, lanceolate, 1-3 cm. long, obtuse 

 or acute, serrate, slightly pubescent on both surfaces ; flowers not seen ; drupes solitary, 

 borne on stout peduncles 2-3 mm. long, globose, glabrous, black, 5 mm. in diameter. 



Type collected near Etzatlan, Jalisco, October 2, 1903,/. A'. Rose & Joseph H. Painter 7534 (TJ. 

 S. Nat. Herb. no. 451142). 



57. Elaphrium penicillatum DC. Prodr. 1 : 724. 1824. 



Amyris penicillata Spreng. Svst. 2: 219. 1825. 



Bursera penicillata Engler, in DC. Monog. Phan. 4 : 52. 1883. 



Terebinthus penicillata Rose, Contr. U. S. Nat. Herb. 10: 121. 1906. 



Probably a tree ; leaves pinnate ; rachis winged ; leaflets 7-9, oval-oblong, acuminate, 

 strongly toothed, subglabrous ; inflorescence shorter than the leaves; fruit unknown. 



Type locality : Mexico. 



Distribution : Mexico. 



Illustration : Moc. & Sesse, Calq. Dess. pi. 207 ; pi. xxx,f. C. 



58. 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. 



59. Elaphrium laxiflorum (S. Wats.) Rose. 



Bursera laxiflora S. Wats. Proc. Am. Acad. 24: 44. 1889. 

 Terebinthus laxiflora Rose, Contr. U. S. Nat. Herb. 12 : 279. 1909. 



A small tree, the trunk 1.5-3 dm. in diameter; young branches, and sometimes those 

 of the second year, pubescent ; leaves pinnate ; rachis narrowly winged, somewhat pubes- 

 cent ; leaflets 5-9, ovate to oblong, obtuse, entire or few-toothed; inflorescence 1-3- 



