Part 3, 1911] BURSERACEAE 251 



43. Elaphrium glabrifolium H.B.K. Nov. Gen. & Sp. 7 : 28. 1824. 



A tree ; young branches tomentose ; leaves clustered at the ends of the branches, once- 

 pinnate ; rachis winged, subdentate ; leaflets 7-9, obtuse, glabrous on both sides, shining 

 above, reticulately veined beneath, strongly crenate ; drupes globose, the size of a pea. 



Type locality: Near Ario, between Patzcuaro and Jorullo, Michoacan. 



Distribution : Known only from the type locality. 



44. Elaphrium fagaroides H.B.K. Nov. Gen. & Sp. 7 : 27. 1824. 



Amyr is fagaroides Spreng. Svst. 4 : Cur. Post. 148. 1827. 



Bursera fagaroides Engler, in DC. Monog. Phan. 4: 48. 1883. 



Terebinthus fagaroides W. F. Wight ; Rose, Contr. U. S. Nat. Herb. 10 : 119. 1906. 



A tree, very much branched; branches grayish or brownish; leaves pinnate; rachis 

 hardlv if at all winged ; leaflets 5-7, glabrous, obtuse, cuneate at base, crenate, small ; 

 flowers borne in dense clusters on short stunted branches ; drupes few, borne on short 

 peduncles, globose, smooth. 



Type locality : Queretaro, Queretaro. 



Distribution : Central Mexico. 



Illustration : H.B.K. Nov. Gen. & Sp. 7 : pi. 611. 



45. Elaphrium Nelsoni Rose. 



Bursera Nelsoni Rose, Contr. U. S. Nat. Herb. 3: 314. 1895. 

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



A shrub or tree ; branches dark-brown to nearly black ; leaves pinnate ; leaflets 5-9, 

 oblong to ovate, 8-16 mm. long, obtuse, rounded at base, the terminal one cuneate, crenately 

 toothed above the middle, glabrous and shining above, strongly reticulate and nearly 

 glabrous beneath ; rachis 3.6-5 cm. long, silky-pubescent especially below, narrowly winged 

 between the leaflets; flowers in short drooping panicles 2-3 cm. long; pedicels 2-3 mm. 

 long, hairy ; calyx-lobes small ; petals 3 mm. long, hairy ; drupes solitary on long slender 

 peduncles, 16 mm. long, or sometimes geminate on shorter pedicels, obovate, obtuse, 8 

 mm. long, the exocarp glabrous, splitting into two valves ; stone globular, light-colored. 



Type locality : Atlixco, Puebla. 

 Distribution : Puebla. 



46. Elaphrium pubescens Schlecht. Linnaea 16 : 527. 1842. 



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



Rachis of leaf winged ; leaflets 7, 3-5 cm. long, narrowly elliptic, acute and acuminate, 

 cuneate at base, entire below, coarsely and irregularh' toothed above, pubescent on both 

 sides; inflorescence as long as the leaves; calyx-lobes 4, very short, ciliate ; petals 4, 

 elliptic, obtuse, somewhat narrowed at base, glabrous. 



Type locality-: Campeche. 



Distribution : Probably common in Campeche and Yucatan. 



47. Elaphrium pilosum (Engler) Rose. 



Bursera grazvolens pilosa Engler, in DC. Monog. Phan. 4: 49. 1883. 

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



A small tree ; young branches nearly or quite glabrous ; leaves pinnate, usually clus- 

 tered with the inflorescence at the ends of short branches ; rachis more or less winged ; 

 leaflets 7-15, lanceolate, acuminate, 4-8 cm. long, glabrous on both surfaces, or sometimes 

 pilose on the under surface along the midrib, the margin strongly toothed ; inflorescence 

 an open panicle ; calyx-lobes narrowly ovate, acute, hairy ; petals twice as long as the sepals, 

 hairy ; ovary and fruit glabrous, the latter 10-12 mm. long. 



Type locality: Colitna. 



Distribution : Southern Chihuahua and Sinaloa to Colima. 



This species has heretofore been confused with E. grazvolens H.B.K., a South American 

 species, but is much less pubescent and has differently toothed leaves and different sepals. 



48. Elaphrium confusum Rose, sp. nov. 



A small tree, glabrous throughout ; branches pale, the bark readily peeling off ; leaves 

 clustered at the ends of short branches ; rachis narrow, slightly winged ; leaflets 5-9, nar- 



