120 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



apart and 1 to 4 mm. long, the margin nearly straight between their somewhat 

 raised bases. " Hacqui," " sac-ci," " gray agave," or " henequen." 

 The source of the larger part of the " Sisal hemp " exported from Yucatfin. 



33. Agave datylio Weber, Bull. Mus. Hist. Nat. 8: 223. 1902. 

 Baja California ; type from La Paz. 



Acaulescent ; leaves yellow-green or gray-green, 3 to 4 cm. wide, 30 to 75 cm. 

 long, with purplish or blackish spine 4 to 6 mm. wide and 20 to 30 mm. long, 

 and glossy, chestnut, heavily triangular or slender-cusped teeth 20 to 30 or 50 

 mm. apart and 3 to 5 mm. long, the intervening margin nearly straight. 



34. Agave vexans Trel. Rep. Mo. Bot. Gard. 22: 62. 1911. 

 Baja California ; type from Mulege. 



Acaulescent ; leaves gray-green, 2 cm. wide, 20 to 45 cm. long, with gray- 

 brown spine 3 to 5 mm. wide and 25 to 35 mm. long, and triangular or slender- 

 cusped, detachable teeth 15 to 20 mm. apart and 3 to 4 mm. long. 



35. Agave nivea Trel. Trans. Acad. St. Louis 23: 143. 1915. 

 Guatemala ; type from El Rahcho. 



Acaulescent ; leaves very glaucous, very concave, 15 cm. wide, 200 cm. long, 

 with black-chestnut spine 3 mm. wide and 15 to 20 mm. long, and triangular 

 slender-cusped teeth 30 to 50 mm. apart and 3 mm. long, their bases often 

 fleshy, the intervening margin nearly straight. 



36. Ag-ave sicaefolia Trel. Trans. Acad. St. Louis 23: 141. 1915. 

 Guatemala; type from El Rancho. 



Acaulescent ; leaves gray, flat or concave, 7 to 8 cm. wide, 60 to 75 cm. long, 

 with purplish chestnut spine 4 mm. wide and 30 to 40 mm. long, and mostly 

 upcurved, slender teeth 15 to 35 mm. apart and 3 to 5 mm. long, the interven- 

 ing margin sometimes with smaller straight teeth. 



37. Agave m.acroacantha Zucc. Act. Acad. Caes. Leop. Carol. 16^ 676. 1833. 

 Agave piigioniformis Zucc. Act. Acad. Caes. Leop. Carol. 16': 676. 1833. 

 Agave flavescens Salm-Dyck, Hort. Dyck. 8, 305. 1834. 



Agave flavescens macroacantha Jacobi, Hamb. Gart. Zeit. 1864: 500. 1864. 



Agave bessereriana Van Houtte, Cat. 1868: 32. 1868. 



Agave subfalcata Jacobi, Wochenschr. Ver. Beford. Gartenb. 1869: 179. 1869. 



Agave linearis Jacobi, Wochenschr. Ver. Beford. Gartenb. 1869: 179. 1869. 



Agave concinna Baker, Gard. Chron. n. ser. 8: 137. 1877. 



Agave sudburyensis Baker, Gard. Chron. n. ser. 8: 137. 1877. 



Agave paucifolia Baker, Gard. Chron. n. ser. 9: 266. 1878. 



Agave oligophylla Baker, Gard. Chron. n. ser. 10: 492. 1878. 



? Agave loiesenburgensis W^ittm. Gart. Zeit. 4: 13. 1885. 



Agave baxteri Baker, .\maryll. 178. 1888. 



? Agave integrifolia Baker, Amaryll. 185. 1888. 



Puebla ; type cultivated in Europe, probably from TehuacJin. 



Acaulescent; leaves glaucous, 2 to 4 (or 7) cm. wide, 20 to 55 cm. long, with 

 dark brown or blackish spine 4 to 6 mm. wide and 15 to 25 mm. long or more, 

 and heavy-based, rather upcurved teeth 15 to 20 mm. apart and 2 to 3 mm. long. 

 " Espadilla." 



38. Agave yaquiana Trel., sp. no v. 



Acaulescent; leaves falcately erect, glaucous and green-zoned, 5 cm. wide, 75 

 cm. long, with brown decurrent spine 4 ram. wide and 25 mm. long, and rather 

 heavy, mostly upcurved, triangular teeth 15 to 20 or even 50 mm. apart and 36 

 mm. long, the intervening cartilaginous margin very slightly hollowed. 



Sonora ; type, in the herbarium of the Missouri Botanical Garden, from rocky 

 hillsides between Hermosillo and Ures, Trelease 391. 



" Mezcal." 



