250 NORTH AMERICAN FLORA [Volume 25 



5-7, 2-3 cm. long, narrowly ovate to spatulate, obtuse, cuneate at base, entire ; flowers 

 not seen ; drupes solitary, globose, on rleflexed peduncles 2 mm. long. 



Type locality: Zacuapan, Vera Cruz. 

 Distribution : Vera Cruz. 



38. Elaphrium Covillei Rose, sp. nov. 



A small tree, 4-6 meters high with a trunk 10-20 cm. in diameter ; branches slender, 

 reddish, glabrous, somewhat glaucous ; leaves alternate, pinnate; rachis slightly winged; 

 leaflets 7-11, lanceolate to oblong, 10-18 mm. long, glabrous, entire, obtuse, the terminal one 

 often wanting ; flowers solitary, rarely in pairs ; peduncles 3-8 mm. long ; drupes globose 

 or somewhat 3-angled, pointed, black, somewhat glaucous, glabrous, 7-9 mm. long, usually 

 nodding or hanging. 



Type collected about 6 miles west of Torres, Sonora, February 7, 1903, F. V. Coville 1940 (U. 

 S. Nat. Herb. no. 398060). 



Near E. microphyllum, but with broader leaflets and duller-colored branches. 



39. Elaphrium odoratum (Brand.) Rose. 



Bursera odorata Brand. Proc. Calif. Acad. II. 2 : 138. 1889. 

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



A shrub or small tree, 2-4 meters high, the trunk 5-8 cm. in diameter, the inner bark 

 thin and yellowish ; young branches glabrous, pale-red, the old ones dark ; leaves pinnate ; 

 rachis very narrowly winged ; leaflets usually 7, oblong-ovate, acute, entire, glabrous, 12-14 

 mm. long; inflorescence of 1-3 flowers ; pedicels short, recurved in fruit; drupes globose, 

 glabrous. 



Type locality" : San Gregorio, Lower California. 



Distribution : Lower California. 



40. Elaphrium microphyllum (A. Gray) Rose. 



Bursera microphylla A. Gray, Proc. Am. Acad. 5 : 155. 1861. 

 Terebinthus microphylla Rose, Contr. U. S. Nat. Herb. 10: 120. 1906. 



A small tree ; young branches glabrous ; old branches cherry-red ; leaves once-pinnate ; 



rachis narrowly winged ; leaflets 7-33, oblong-linear, obtuse, sessile, 6-8 mm. long, glabrous ; 



inflorescence appearing before the leaves, 1-2 cm. long, glabrous, 1-3-flowered (as many as 



4 flowers have been reported); pedicels slender, 3-4 mm. long; calyx-lobes ovate, 1 mm. 



long ; petals 5, 4 mm. long ; stamens 10, shorter than the petals ; drupes glabrous, usually 



solitary, 3-angled, hanging; exocarp splitting into 3 valves; stone sharply 3-angled, yellow, 



6 mm. long, with a circular deep depression at base in the mesocarp. 



Type locality : Sierra Tule, Sonora. 



Distribution : Southern Arizona, Sonora, and Lower California. 



41. Elaphrium morelense (Ramirez) Rose. 



Bui sera morelensis Ramirez, Anal. Inst. Med. Nac. 2 : 17. 1896. 

 Terebinthus morelensis Rose, Contr. U. S. Nat. Herb. 10: 120. 1906. 



A small tree, with branches, foliage, and inflorescence glabrous from the first ; leaves 

 once-pinnate, the rachis only slightly winged ; leaflets 15-35, linear-oblong, acute, 8-12 mm. 

 long, glabrous, entire, not at all reticulately veined ; peduncles one-flowered, perhaps some- 

 times several-flowered, 8-15 mm. long, nodding wdien in fruit ; drupes globose, 6-S mm. long. 



Type locality : District of Ayala, Morelos. 

 Distribution: Morelos to Oaxaca (?). 

 Illustration: Anal. Inst. Med. Nac. 2: pi. 3. 



42. Elaphrium multifolium Rose. 



Terebinthus mutti/olia Rose, Contr. U. S. Nat. Herb. 10: 120. 1906. 



A small shrub 2.4 meters high ; branches dark, sometimes reddish, glabrous ; very young 

 branches puberulent ; leaves borne in clusters near the ends of short branches, once-pinnate ; 

 leaflets 15-19, linear-oblong, 10-13 mm. long, 2-3 mm. broad, glabrous, entire, obtuse; 

 drupes solitary on short reflexed peduncles, globose, glabrous, 6 mm. long. 



Ty'PE LOCALITY : San Juan Capistrano, Zacatecas. 

 Distribution : In valleys of Zacatecas. 



