STANDLEY TEEES AND SHRUBS OF MEXICO. 269 



Leaflets 3, the terminal one sessile. 



Leaflets green, merely coriaceous, dentate 18. 0. eutriphyllus. 



Leaflets pale, rigid-coriaceous, deeply lobed 13. O. trifoliolatus. 



Leaflets usually more than 3, if 3 the terminal leaflet petiolulate. 

 Flowers paniculate or in elongate long-pedunculate racemes. 

 Leaflets entire. 



Inflorescence paniculate 1. 0. ehrenbergii. 



Inflorescence racemose. 



Leaflets acute 4. 0. tenuifolius. 



Leaflets rounded or very obtuse at the apex. 



Pedicels 3 to 5 mm. long ; leaflets green 2. 0. chochoco. 



Pedicels 15 to 20 mm. long; leaflets very pale, especially beneath. 



3. 0. longipes. 

 Leaflets dentate. 



Leaflets narrowly lanceolate, mostly 8 to 12 cm, long 5. 0. lanceolatus. 



Leaflets ovate or oval, usually much less than 8 cm. long. 



Lateral leaflets 2 pairs ; 6. O. quinquefolius. 



Lateral leaflets 3 to 6 pairs. 

 Leaflets acute or acutish. 

 Teeth of the leaflets small, appressed ; leaflets subcoriaceous. 



7. O. hartwegii. 

 Teeth of the leaflets large, spreading; leaflets coriaceous. 



8. O. ilicinus. 

 Leaflets rounded or very obtuse at the apex. 



Flowers racemose 9. O. andrieuxii. 



Flowers paniculate. 



Leaflets subsessile, remote 10. O. pallidas. 



Leaflets evidently petiolulate, the margins overlapping. 



Leaflets 4 to 5 cm. long, 2 to 3 cm. wide 11. 0. zimapanus. 



Leaflets 5 to 11 cm. long, 3 to 9 cm. wide 12. O. paxii. 



Flowers in short, sessile or short-pedunculate racemes. 

 Leaflets very rigid, pale on both surfaces, with large stiff teeth. 



14. O. fremontii. 

 Leaflets merely coriaceous, deep green on one or both surfaces. 



Leaflets entire or with few appressed teeth 15. O. gracilis. 



Leaflets with numerous spreading teeth. 



Leaflets 1 to 2 cm. long, 0.7 to 1 cm. wide 16. O. angustifolius. 



Leaflets 3 to 8 cm. long, 1 to 4 cm. wide. 



Leaflets ovate-lanceolate or lanceolate 17. O. incertus. 



Leaflets ovate to broadly oval. 



Leaflets usually 5 19. O. trifolius. 



Leaflets 7 to 11 in all or most of the leaves. 



Leaflets much longer than broad, mostly 1 to 1..5 cm. wide, with 



numerous small teeth 20. 0. fascicularis. 



Leaflets little longer than broad, 2.5 to 4 cm. wide, with few large 

 teeth 21. 0. wilcoxii. 



1. Odostemon ehrenbergii' (Kunze) Standi. 

 Berl)eris ehrcnhergii Kunze, Linnaea 20: 45. 1847. 

 Mahonia ehren'bergii Fedde, Bot. Jahrb. Engler 31: 106. 1901. 



'Carl August Ehrenberg (1801-1849) spent 10 years (1831-1840) in Mexico in 

 Oaxaca, Puebla, Mexico, Hidalgo, San Luis Potosi, and other states. He was 

 especially interested in Cactaceae, many species of which he introduced into 

 cultivation in Europe. His collections consisted of about 2,000 numbers. 



