252 NORTH AMERICAN FLORA [Volume 25 



rowly lanceolate, 1.5-2.5 cm. long, acute; flowers borne in numerous clusters, appearing 

 with the young leaves ; calyx-lobes ovate, 1 mm. long ; petals 3.5-4 mm. long ; drupes more 

 or less wrinkled, 5-6 mm. long; stone often nearly globose. 



Type collected near Tapotla, Jalisco, May 27, 1893, C. G. Pringle 4372 (U. S. Nat. Herb. no. 

 200701). 



49. Elaphrium tenuifolium Rose. 



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

 Terebinthus ienuifolia Rose, Contr. U. S. Nat. Herb. 10: 122. 1906. 



A small tree, 7.5 meters high, glabrous throughout ; leaves often clustered at the ends 

 of short, stunted branches; leaflets 7-15, narrowly lanceolate, acute, cuneate at base, 1.2-3.6 

 cm. long, entire or slightly crenate ; rachis 12-50 mm. long, slightly winged; flower clus- 

 ters 1-3-flowered, several in the axils of the leaves ; peduncle and pedicels very short ; 

 drupes 6 mm. long, 3-valved. 



Type locality : L,odiego, Sinaloa. 



Distribution : Known only from the t3'pe locality. 



50. Elaphrium fragile (S. Wats.) Rose. 



Bursera fragi lis S. Wats. Proc. Am. Acad. 21 : 422. 1886. 

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



A small tree, 3-5 meters high, the trunk 5-8 cm. in diameter, glabrous throughout ; 

 leaves pinnate ; rachis narrowly winged ; leaflets 3-5, lanceolate, acuminate, cuneate at 

 base, crenate-serrate, 2-6 cm. long; peduncles 1-3-flowered ; petals 6-12 mm. long; drupes 

 obovoid, 6-10 mm. long. 



Type locality : Hacienda San Miguel, near Batopilas, Chihuahua. 

 Distribution : Hot valleys of southern Chihuahua. 



51. 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, acumi- 

 nate, 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. 



52. 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. 



53. Elaphrium bicolor Schlecht. L,innaea 17 : 625. 1843. 



Bursera bicolor Engler, in DC. Monog. Phan. 4 : 53. 1883. 

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



A small tree with rounded top ; young branches reddish, glabrous ; leaves pinnate ; rachis 

 narrowly winged; leaflets 9-19, linear to narrowly lanceolate, acminate, above dark-green, 

 glabrous or nearly so, beneath with a white matted tomentum, the margin subeutire, revo- 

 lute ; inflorescence a narrow panicle 10-20 cm. long, more or less glandular ; calyx-lobes 

 triangular-ovate, 4 mm. long, glandular and pubescent ; petals purplish, 5-6 mm. long, 

 long-pilose; ovary oblong, acuminate, glandular; drupes 10-15 mm. long. 



Type locality : Real de Huauta [Cuautla], Morelos. 

 Distribution : Vera Cruz (?) to Morelos. 



