114 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves small (scarcely 1 cm. wide and 10 cm. long), denticulate at base. 

 Spine flat. 



Marginal threads coarse 158. A. parviflora. 



Marginal threads fine 159. A. toumeyana. 



Spine and leaf tip involute 160. A. hartmani. 



Leaves elongate, or broader in dwarf forms, 

 lieaves not recurving. 



E. Leaves narrow (scarcely 1 cm. wide). 



Leaves denticulate at base 161. A. mulfordiana. 



Leaves not denticulate 162. A. schottii. 



EE. Leaves moderately broad (1 to 2 cm.), not denticulate. 



Threads coarse, shaving-like 163. A. schidigera. 



Threads fine, coiling 164- A. angustissima. 



EEE. Leaves relatively broad (2.5-4 cm.), denticulate on suckers. 



165. A. filifera. 



Leaves recurving, very long and narrow 166. A. geminifl^ora. 



AA. Leaves striate-ridged, linear, without coarse teeth or mai'ginal threads or 

 horny margin. 

 Leaves long and narrow (0.5 cm. wide, 60 to 90 cm. long) ; spine very slender. 



167. A. striata. 

 Leaves shorter and broader (1 cm. wide, 25 to 50 cm. long) ; spine stouter. 



Leaves densely clustered, rhombic in section 168. A. echinoides. 



Leaves fewer or laxer, often 3-sided. 



Leaves nearly smooth on the margin 169. A. stricta. 



Leaves scabrid on the margin 170. A. falcata. 



1. Agave panamana Trel., sp. nov. 



Leaves thin, 5 cm. wide and 65 cm. long, with a blackish needle-shaped spine 

 scarcely 2 mm. wide and 10 mm. long, and small upcurved teeth 15 mm. apart 

 and 1 to 2 mm. long ; inflorescence 1 to 3 meters tall ; flowers GO mm. long, with 

 segments equaling the tube, the filaments inserted about the upper third ; freely 

 bulbit'erous. 



Panama (type, in the herbarium of the New York Botanical Garden, from 

 Urava Island, Howe, in 1909). 



Known as " vara de San Jos^." 



2. Agave rubescens Salm-Dyck, Hort. Dyck. 8, 306. 1834. 

 Agave flaccida Salm-Dyck, Hort. Dyck, 306. 1834. 

 Af/avc punctata Salm-Dyck, Hort. Dyck. 8, 306. 1834. 

 Ayavc (hensispina Cels, Cat. 1865. 



? Agave erubescens Ellemeet, Belg. Hort. 1871: 119. 1871. 



Puebla and Oaxaca ; type cultivated in Euroiie from an unspecified locality. 



Nearly acaulescent; leaves gray, tinged with purple, 5 cm. wide, 75 cm. long, 

 with a brown spine 4 mm. wide and 25 mm. long, and very slender, upcurved, 

 orange or brown teeth 10 to 20 mm. apart and 3 to 4 mm. long, tlie translucent- 

 margin straight between them. 



3. Agave stringens Trel., sp. nov. 



Leaves concave, thin and recurving, very glaucous, 1 to 2 cm. wide and 60 

 cm. long or more, with a dark brown conical spine about 2 mm. wide and 8 mm. 

 long, and very sharp and slender, red or brown, curved teeth scarcely 5 mm. 

 apart and 1 to 2 mm. long, the intervening cartilaginous margin nearly straight. 



Jalisco; type, in the herbarium of the Missouri Botanical Garden, from RIo 

 Blanco barranca, Trelcafie, in 1904. 



4. Agave angustifolia Haw. Syn. PI. Succ. 72. 1812. 



Agave xorightii Drummond, Rep. Mo. Bot. Gard. 18: 27. 1907. 



