Part 3, 1911] BURSERACEAE 257 



76. Elaphrium excelsum H.B.K. Nov. Gen. & 



Sp. 7 : 30. 1824. 



Bursera excelsa Engler, in DC. Monog. Phan. 4 : 57. 1883. 



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



A tree, with red bark ; branches smooth and glabrous below, pubescent above ; leaves 

 pinnate ; rachis winged, toothed ; leaflets 5-9, obtuse, strongly crenate, pubescent above, 

 tomentose beneath, the terminal ones 5 cm. long, cuneate at base; peduncle axillary, short, 

 tomentose. 



Type locality : Between Acapulco and El Exido, Guerrero. 

 Distribution : West coast of southern Mexico. 

 Illustration: H.B.K. Nov. Gen. & Sp. pi. 611, in part. 



77. Elaphrium cuneatum Schlecht. Linnaea 17 : 629. 1843. 



Bursera cuneala Engler, in DC. Monog. Phan. 4 : 56. 1883. 

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



Probably a tree ; young branches pubescent ; leaves pinnate ; rachis winged ; leaflets 7-9, 

 elliptic to oblong, acute, cuneate at base, serrate, strongly nerved, somewhat pubescent 

 above, densely pubescent beneath ; fruiting racemes longer than the petioles ; drupes ovoid to 

 orbicular, acute. 



Type locality : Near " Zamaliztlahuaca " [?Tlamixtlahuaca, Guerrero]. 

 Distribution : Vera Cruz (?) and Guerrero. 



Doubtful and excluded species 



Amyris Tecomaca DC. Prodr. 2 : 82. 1825. Mexico. (Moc. & Sess£, Calq. Dess. pi. 

 195.) If an Elaphrium, near E. graveolens and E. pilosum, but with fewer leaflets. 



Bursera pubescetis S. Wats. Proc. Am. Acad. 24: 44 (1889), is Veatchia discolor 

 (Benth.) Brand. 



Elaphrium ariense H.B.K. Nov. Gen. & Sp. 7: 31. 1824. Amyris aricnsis Spreng. 

 Syst. 4 : Cur. Post. 149. 1827. A small tree ; branches angled, softly villous ; leaves pin- 

 nate ; rachis slightly winged; leaflets 11-15, oblong, acute or subacuminate, obtuse at base, 

 crenate-serrate, above pubescent, beneath somewhat canescent, 30-3S mm. long, 12 mm. 

 broad, the lower ones smaller; inflorescence and fruit unknown. Central Mexico. 



Elaphrium copalliferum DC. Prodr. 1 : 724. 1824. Amyris copallifera Oliva, Natur- 

 aleza 1 : 40. 1869. Probably a shrub : leaves pubescent ; rachis of leaf winged ; leaflets 

 7-13, lanceolate, acute, dentate; inflorescence compact; pedicels very short. Mexico. 

 Moc. & Sesse, Calq. Dess. pi. 202 ; pi- xxx,f. B. 



Idea serrata DC. Prodr. 2: 77. 1825. Mexico. 



2. TETRAGASTRIS Gaertn. Fruct. 2: 130. 1790. 



Hedwigia Sw. Prodr. 4. 1788. Not Hedwigia Ehrh. 1781. 

 Knorrea Moc. & Sesse, in DC. Prodr. 2 : 80, as synonym. 1825. 

 Caproxylon Tussac, Fl. Ant. 4 : 87. 1827. 



Trees with whitish bark. Leaves large, compound, pinnate, alternate ; leaflets lanceo- 

 late, short-petiolulate. Inflorescence paniculate, axillary. Flowers polygamous. Calyx 

 small, 4- or 5-lobed, the lobes equal and imbricate in the bud. Petals 4 or 5, alternating 

 with the calyx-lobes, united into a short tube. Stamens 10-lobed. Ovary partly immersed, 

 4- or 5-celled. Fruit a drupe, globose, 2-4-celled. 



Type species, T. ossea Gaertn. 



Corolla-lobes equal to the tube ; leaflets broadly lanceolate. 1. T. bahamifcra. 



Corolla-lobes shorter than the tube ; leaflets narrowly elliptic. 2. T. panamensis. 



1. Tetragastris balsamifera (Sw.) Kuntze, Rev. Gen. 107. 1891. 



Hedwigia balsamifera Sw. Prodr. 62. 1788. 

 Tetragastris ossea Gaertn. Fruct. 2 : 130. 1791. 

 Bursera balsamifera Pers. Syn. PI. 1 : 524. 1805. 

 Caproxvlon Hedwigii Tussac, Fl. Ant. 4 : 87. 1827. 

 Hedwigia TussacciiWalp. Rep. 1: 559. 1842. 

 Idea Hedwigia A. Rich. Ess. Fl. Cuba 388. 1842. 



