1530 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Phyllaries broadly oblong 12. M. liebmannii. 



Phyllaries smaller, 3 to 7 mm. long. 



Leaves very large, 10 to 30 cm. wide, deeply palmate-lobed, on wingless 



petioles 15. M. hibiscifolia. 



Leaves much smaller, or else merely angulate-lobed. 



Leaves oblong or elliptic-oblong, the petioles short, naked or winged. 



13. M. samalensis. 

 Leaves mostly ovate or lance-ovate. 



Petioles short, winged throughout 14. M. tehuacana. 



Petioles usually rather long, winged only at apex if at all. 



Pales in fruit stiff and firm, gradually long-acuminate into a 

 stout spinescent tip. 

 Leaves essentially glabrous beneath except along the veins. 



17. M. frutescens. 



Leaves hirtellous beneath 18. M. arborescens. 



Pales in fruit thin, subscarious, varying from abruptly mucronate 

 to short-acuminate. 

 Pales in fruit rather densely long-pilose, especially on margin. 



23. M. pilosipalea. 

 Pales in fruit subglabrous or sparsely pubescent. 

 Plants scandent. 



Leaves broadly ovate or deltoid-ovate, rounded or 

 truncate to subcordate at base. 



Leaves puberulous beneath 26. M. paucifiora. 



Leaves sordid-tomentulose beneath 27. M. schottii. 



Leaves lance-ovate, cuneate at base 28. M. gracilis. 



Plants not scandeiit. 



Leaves hexagonal-ovate, about 14 cm. long and nearly as 

 wide, long-petioled, arachnoid-tomentose beneath; 

 branchlets strongly quadrangular. 



16. M. hexagona. 

 Leaves usually much longer than wide, not arachnoid- 

 tomentose beneath; branchlets not strongly quad- 

 rangular. 

 Pales in fruit retuse and short-mucronate. 



Leaves pubescent beneath on all the veins and 



veinlets 24. M. subtruncata. 



Leaves sparsely' puberulous beneath on the chief 



veins 25. M. affinis. 



Pales in fruit rather gradually or abruptly cuspidate or 

 mucronate, not retuse. 

 Pales in fruit with straightish tips. 



Lea\'^s rhombic-ovate or triangular-ovate, shortly 



cuneate at base 19. M. purpurascens. 



Leaves lanceolate to lance-obovate, truncate at 



base 20. M. arsenei. 



Pales in fruit with uncinate-recurved tips. 



Leaves lanceolate to ovate, obscurely or not at all 



angulate-lobed 21. M. uncinata. 



Leaves usually rhombic-ovate, distinctly angulate- 

 lobed 22. M. patens. 



1. Montanoa hemsleyana (Kuntze) Blake. 



Montanoa sp. (no. 24) Hemsl. Biol. Centr. Amer. Bot. 2: 166. 1881. 

 Eriocoma hemsleyana Kuntze, Rev. Gen. PI. 1: 336. 1891. 



