Part 3, 1911] BURSERACEAE 247 



beneath, quite glabrous on both sides even when quite young ; inflorescence paniculate, 



10 cm. long; flowering pedicels 4-5 mm. long, in fruit 5-S mm. long; calyx-lobes ovate, 



obtuse ; petals white, oblong, 3 mm. long ; drupes oblong, 12 mm. long, borne in a dense 



cluster. 



Type locality: Matamoras, Puebla. 



Distribution : Hot valleys and hills of Puebla and Morelos. 



20. Elaphrium attenuatum Rose. 



Ten bin I Inn attenuate. Rose, Contr. U. S. Nat. Herb. 12 : 278. 1909. 



A tree ; branches even when quite young perfectly glabrous ; leaves large, pinnate ; 

 leaflets 5-7, lanceolate, long-attenuate, rounded at base, 8-12 cm. long, rather thin (at 

 least on flowering specimens), perfectly glabrous on both surfaces exeept for some tufts of 

 hairs in the lower axils of the veins on the under surface ; racemes slender, clustered at 

 the ends of the second-year branches, 10-15 cm. long, glabrous; immature drupes glabrous. 



Type locality : Colomas, Sinaloa. 



Distribution : Foothills of Sinaloa. 



21. Elaphrium acuminatum Rose. 



Terebinlhus acuminata Rose, Contr. U. S. Nat. Herb. 12: 278. 1909. 



A small shrub, 3-4 meters high, the trunk and older branches shedding the bark and 

 becoming reddish-brown ; leaves large, pinnate ; rachis of leaf terete, pubescent ; leaflets 

 5-7, broadly lanceolate, acuminate, 6-10 cm. long, glabrous or nearly so above, somewhat 

 pubescent beneath especially on the veins ; drupes in rather dense racemes, short-oblong, 

 glabrous. 



Type locality: Near Chapala, Jalisco. 



Distribution : Dry hills of Jalisco and Michoacan. 



22. Elaphrium subpubescens Rose. 



Bursera gummifera pubescens Engler, in DC. Monog. Phan.4: 40. 1883. Not Elaphrium pubes- 

 cens Sehleeht. 1842. 



Probably a large tree ; leaves pinnate ; leaflets 5, lanceolate, acuminate, glabrous 

 above, pubescent on the veins beneath, 5-6 cm. long; flowers not seen ; drupes globose or 

 somewhat 3-angled, glabrous. 



Type locality : Orizaba, Vera Cruz. 



Distribution : Vera Cruz, in the neighborhood of Orizaba. 



23. Elaphrium heterophyllum (Engler) Rose. 



Bursera heterophvlla Engler, in DC. Monog. Phan. 4 : 46. 1883. 

 Terebinlhus heterophylla Rose, Contr. U. S. Nat. Herb. 10 : 119. 1906. 



Young branches reddish-pubescent, in age glabrous ; leaflets 3-5, subcoriaceous, beneath 

 densely tomentose, above reddish-pilose, elliptic, entire ; flowers subsessile ; calyx-lobes 

 linear, obtuse, 3 mm. long; petals oblong; fruit not known. 



Type locality : Haquiltenango, Vera Cruz (?). 

 Distribution : Known only from the type locality. 



24. Elaphrium arboreum Rose. 



Terebinlhus arborea Rose, Contr. U. S. Nat. Herb. 10: 118. 1906. 



A tall tree ; old trunks red and smooth ; young branches pubescent ; leaflets 2-4 pairs, 

 4-9 cm. long, ovate, rounded or cuneate or rarely cordate at base, more or less abruptly 

 acuminate, the tip obtuse, somewhat pubescent on both sides ; inflorescence paniculate ; 

 fruit glabrous ; calyx-lobes ovate, acute, ciliate ; drupes in very compact clusters. 



Type locality: Between Acaponeta and Concepcion, Tepic. 



Distribution : Common along the coastal plain of southern Sinaloa and Tepic. 



25. Elaphrium Kerberi (Engler) Rose. 



Bursera Kerberi Engler, in DC. Monog. Phan. 4 : 41. 1883. 

 Terebinlhus Kerberi Rose, Contr. U. S. Nat. Herb. 10: 119. 1906. 



A shrub ; branches glabrous ; leaves clustered at the top of stunted branches ; leaflets 

 always 3, glabrous, lanceolate, long-acuminate, 4-8 cm. long, sharply serrate ; inflorescence 



