39i DK. A. B. EENDLE— SYSTEMATIC 



North America — Buffalo {Clinton); Eocliester, Onadaga lake, N.Y. ; Cayuga 

 marshes, jS\Y. {Budley) ; Utah {Furry, no. 32) ; Santa Cruz river, S. xirizona 

 {Falmer, no. 249) ; Plorida. 



Eesemhles the form y of the type in its prominent leaf-spines, though the leaves are 

 smaller, /3 in its medium-sized fruit. 



This is a more widely spread MS. variety of Braun's, in which var. recurvataf 

 Dudley, must, I think, be included. Prof. Dudley's plant, from Cayuga marshes, 

 New York, is a form with very sparsely spinose internodes, and slightly less prominent 

 leaf -teeth. 



One of the specimens from Plorida on which Braim founded his variety has very 

 slender leaves and approaches his var. angustifoUa, recalling especially a type specimen 

 from 0-Wahu in Herb. Braun. 



Var. Ehrenbergii, A. Br. in Journ. Bot. ii. (1864) 275 ; K. Schum. in Mart. Fl. Bras, 



iii" pt. 3, 725 (1894). (PI. XXXIX. figs. 10, 27.) 

 Planta foliis linearibus margine cum dentibus numerosis laminae latitudinem haud 

 sequantibus instructa ; fructu minore. 

 Somewhat densely leaved; leaves with 8 to 12 small teeth on each side, and 2 to 5 on 

 the back ; sheaths with generally 1 to 3 more or less prominent teeth on each shoulder. 

 Fruit (where present) 3 mm. long hy less than 2 mm. broad. 



Arabia — Dhofar Mountains, S.E. Arabia (Fe?if, no. 219). Similar to the Socotran 

 plant. — Wady Djara and Wady Kamme (? spelling) {Ehrenherg). Internodes 

 unarmed, leaves 2 to 2-5 cm. long, 1 to 1*5 mm. wide, sheaths wdth generally 2 

 rather prominent teeth. The type of Braun's variety ; with this I include the 

 following : — 

 North Aprica — Kafr Douan, Tunis {Letoiirneaux). Somewhat similar to the pre- 

 ceding, but with shortly muricate internodes and less regular, slightly more 

 patent teeth ; sheaths with generally 3 teeth on the shoulder. 

 SOCOTRA— (£aZ/ow^', no. 732) ( Schiceinfurth, no. 709 ). A sturdier plant, with much larger 

 leaves, 2*5 to 3*5 cm. long and 1*5 to 2 mm. broad. The internodes are unarmed, 

 and the sheaths have one or more teeth on the shoulder. No fruit. 



Var. RiEDELii, K. Schum. in Mart. Fl. Bras. iii. pt. 3, 725 (1894). 



Planta caulibus laxis psene inermibus ; foliis linearibus utroque margine dentibus 

 patentibus numerosis, dorso spinis pluribus, vagina dentibus prominentibus 1 vel 2 

 instructis. 



Leaves between 2-5 and 3*5 cm. long, 1 to I'S mm. broad. Marginal teeth one-half to 

 two-thirds the leaf-w idth ; as many as 22 on each side. The numerous (as many as nine) 

 dorsal spines are borne on the slightly projecting midrib. 



Brazil — Lago de Pertininga (Fiedel). 



The specimen has neither flowers nor fruit. The variety bears some resemblance to 

 var. Ehrenbergii. 



