Part 3, 1911] BURSERACEAE 249 



32. Elaphrium bipinnatum (DC.) Schlecht. Linnaea 17: 631. 1843. 



Amyris bipinnata DC. Prodr. 2 : 82. 1825. 



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



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



A shrub; leaves bipinnate ; rachis winged; leaflets small, ovate, shining and glabrous 

 above, duller and nearly or quite glabrous beneath ; inflorescence shorter than the leaves, 

 few-flowered ; calyx-lobes linear, as long as or longer than the petals ; drupes globose, 

 glabrous. 



Type locality : Mexico. 



Distribution : Tropical valleys, Sinaloa to Guerrero and Morelos. 



Illustration : Moc. & Sesse, Calq. Dess. pi. 197 . 



33. Elaphrium gracile (Engler) Rose. 



Bursera gracilis Engler, in DC. Monog. Phan. 4 : 50. 1883. 

 Terebinthus gracilis Rose, Contr. U. S. Nat. Herb. 10: 119. 1906. 



Young branches somewhat pubescent; leaves clustered at the ends of stunted branches, 

 or, on vigorous shoots, alternate ; leaves narrow in outline, pinnate or the lower lobes 

 again pinnate ; leaflets small, shining and somewhat hairy above, hairy and somewhat reticu- 

 late beneath ; inflorescence rather compact, shorter than the leaves, hairy ; calyx-lobes 

 ovate, shorter than the petals ; drupes glabrous, smooth. 



Type locality : Xochiculco, Oaxaca. 



Distribution : Common in barrancas and on dry hills of Oaxaca. 



34. Elaphrium aridum Rose. 



Terebinthus arida Rose, Contr. TJ. S. Nat. Herb. 10 : 118. 1906. 



A low shrub ; branches dark-gray, those of the first year densely pubescent, the older 

 ones glabrous; leaves clustered near the ends of short spurs or scattered along the new 

 branches ; leaflets mostly 2-4 pairs, rarely reduced to 3 or sometimes even to one, oblong 

 to spatulate, 4-6 cm. long, obtuse, glabrous on both sides ; petiole and the narrowly winged 

 rachis slightly hairy; flowers subsessile; calyx-lobes half as long as the petals, both hairy; 

 drupes subsessile, glabrous. 



Type locality : Tehuacan, Puebla. 



Distribution : On the very dry hills about Tehuacan. 



Illustration : Contr. U. S. Nat. Herb. 10 : pi. 36. 



35. Elaphrium Galeottianum (Engler) Rose. 



Bursera Galeottiana Engler, in DC. Monog. Phan. 4: 47. 1883. 

 Terebinthus Galeottiana Rose, Contr. U. S. Nat. Herb. 10 : 119. 1906. 



A small tree; young branches softly pubescent ; leaves simply pinnate, their petioles 

 pubescent, narrowly winged ; leaflets 13-25, linear, glabrous, entire ; fruit usually on short 

 recurved pedicels, often forming a cluster at the top of the second-year growth ; drupes 

 obovoid, pointed, glabrous. 



Tvpe LOCALITY: Tehuacan, Puebla. 

 Distribution : Oaxaca and Puebla. 



36. Elaphrium apterum (Ramirez) Rose. 



Bursera aptera Ramirez, Anal. Inst. Med. Nac. 2 : 16. 1896. 

 Terebinthus aptera Rose, Contr. U. S. Nat. Herb. 10: 118. 1906. 



A small tree ; young branches glabrous, reddish ; old branches blackish ; leaves clus- 

 tered at the ends of short, stunted branches, once-pinnate ; rachis narrowly winged ; 

 leaflets 7-11, ovate, obtuse, entire or rarely somewhat crenate, S-15 mm. long, glabrous; 

 peduncles one-flowered, very short, 2-3 mm. long; drupes glabrous, 5 mm. in diameter. 



Type locality: Jojutla, Morelos. 

 Distribution : State of Morelos. 

 Illustration : Anal. Inst. Med. Nac. 2 : pi. 1. 



37. Elaphrium Purpusii (Brand.) Rose. 



Bursera Purpusii Brand. Zoe 5 : 249. 1908. 



A small shrub ; branches gray, glabrous ; leaves pinnate ; rachis not winged ; leaflets 



