528 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



This species has been considered tlie same as C. edulis, but to the writer it 

 seems amply distinct, tlie leaves of the two being very different. All the species 

 of the genus are represented by inadequate herbarium material. 



3. dSTEORIDIUM Hook, f . ; Benth. & Hook. Gen. PI. 1: 312. 1862. 

 1. Cneoridium dumosum (Nutt.) Hook, f . ; Baill. Hist. PI. 4: 498. 1873. 



Pitavia dumosa Nutt.; Torr. & Gray, Fl. N. Amer. 1: 215. 1838. 



Baja California. Southern California; type from San Diego. 



Densely branched shrub. 0.5 to 1.5 meters high ; leaves opposite or fasciculate, 

 linear or oblong-linear, 1.5 to 2.5 cm. long, green, entire or nearly so; flowers 

 very small ; fruit a capsule, 5 to 6 mm. broad. 



4. STAURANTHUS Liebm. Nat. For. Kjcibenhavn Vid. Medd. 1853: 91. 1853. 

 Unarmed trees ; leaves alternate, simple or unifoliolate, gland-dotted ; flowers 

 small, in terminal or axillary racemes or panicles ; fruit a 1-seeded drupe. 

 Leaves 3.5 to 7 cm. wide, abruptly short-acuminate at apex ; flowers racemose. 



1. S. perforatus. 

 Leaves 1.5 to 2.5 cm. wide, gradually attenuate to apex ; flowers mostly panicu- 

 late 2. S. conzattii. 



1. Stauranthus perforatus Liebm. Nat. For. Kjobenhavn Vid. Medd. 1853: 92. 



1854. 

 Zanthoxiilum glnesbregMii Turcz. Bull. Soc. Nat. Moscou 32^: 274. 1859. 

 Veracruz ; type collected between Totutla and Huatusco. 

 Glabrous tree ; leaves unifoliolate, the petioles 0.8 to 2.2 cm. long, the leaflets 

 oblong-elliptic, 10 to 18 cm. long. 



2. Stauranthus conzattii Rose & Standi., sp. nov. 



Type from Cerro San Antonio, Oaxaca, altitude 1,700 meters [Conzatti 2445; 

 U. S. Nat. Herb. no. 84105G). 



Glabrous tree or shrub, with reddish brown branches ; leaves simple, the 

 petioles stout, 5 to 8 mm. long, subterete, the blades lanceolate or oblong- 

 lanceolate, 6 to 9.5 cm. long, 1.3 to 2.5 cm. wide, rounded or obtuse at the base, 

 gradually attenuate from the middle or lower to the acute or subobtuse apex, 

 coriaceous, bright green, sublustrous above, the venation plane or prominulous, 

 scarcely paler beneath, the costa slender but prominent, the other venation 

 prominulous, conspicuously gland-dotted ; flowers few, in small terminal or 

 axillary racemes or panicles, the pedicels stout, 2 mm. long or shorter ; calyx 

 1.8 mm. broad, the lobes very obtuse; ovary smooth; fruit globose, about 8 mm. 

 in diameter ; seed globose, 7 mm. in diameter. 



Only one other species of the genus is known, S. perforatus Liebm. It differs 

 from the present plant in having unifoliolate leaves, the leaflet being much larger 

 and broader than the leaf of S. conzattii, and abruptly short-acuminate at the 

 apex. The Veracruz plant, moreover, has longer petioles and axillary racemes. 

 The flowers of 8. conzattii are not known, and until they have been studied, 

 the generic position of the plant must remain in doubt. It may be that it 

 should be referi-ed rather to Amyris. 



5. AMYRIS L. Syst. Nat. ed. 10. 996. 1759. 



Unarmed trees or shrubs ; leaves opposite or alternate, pinnate, sometimes 

 unifoliolate, the leaflets entire or crenulate ; flowers small, perfect, paniculate, 

 white or yellowish white ; fruit a drupe. 

 Leaflet 1. 



Petioles 2 to 5 mm. long 1. A. monophylla. 



Petioles 15 to 24 mm. long 2. A. rekoi. 



I 



