[Vol. 9 

 120 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Algeria: wet places near Bona, about 1860, LeTourneux (Mo. 

 Bot. Gard. Herb.); ponds of Chaiba near Coleah, 18 April, 

 1859, Herb. Font. norm. (Clauson) 99 (Gray Herb.); Dai'a, 

 29 April, 1859, Herb. Font. norm,. (Clauson} 99 bis (Gray 

 Herb.); Lac de Ouled Dieb., between Bone and LaCalle, 

 LeTourneux (Gray Herb.) ; swamps, Boudom, 12 April, 

 1861, Frag. Fl. Alg. Exsic. 499 (Bourlier) (U. S. Nat. Herb.) ; 

 mares de Bou Zegart between Oued Khamis and Djebel 

 Azieb Dahra, Prov. Oran, 20 May, 1875, Warion PI. Atl. 

 Sel. (Cosson} 189 (Gray Herb, and U. S. Nat. Herb.); 

 Maison Cairee, April, 1878, Debeaux (N. Y. Bot. Gard. 

 Herb.); without definite locality, 1906, Gandoger (Mo. Bot. 

 Gard. Herb.). 



15a. Forma longissima Pfeiffer, comb. nov. 

 7. longissima Bory & Dur. Compt. Rend. Acad. Paris 18 : 1165. 

 1844. 



/. velata var. longissima A. Br. in Bory & Dur. Expl. Sci. Alg. 

 pi. 37. jig. 2. 1846-49. 



Differs from the species in the greater leaf length, as much as 

 50-65 cm. in the larger plants. There is a tendency toward a 

 smaller number of leaves (8-12). 

 Distribution : Algeria. 

 Specimens examined: 



Algeria: LaCalle, May, 1844, Durieu (Mo. Bot. Gard. Herb.) ; 

 LaCalle, May, 1844, Bory (Gray Herb.) ; inundated prairies, 

 24 June, 1844, Motelay (Mo. Bot. Gard. Herb.) ; LaCalle, 

 1864, Durieu (Gray Herb.) ; LaCalle, June, 1884, Debeaux 

 (U. S. Nat. Herb.). 



From the presence of persistent papery brown bases of leaves 

 in some specimens it seems likely that this form may assume 

 practically a terrestrial habit, as in /. Nuttallii A. Br. and /. But- 

 leri Engelm. 



The species shows great variability, and its close allies, differ- 

 ing from it in sometimes inconspicuous features, are correspond- 

 ingly difficult to delimit. Braun and Engelmann were eventually 

 inclined to consider 7. Bory ana, I. tenuissima, I. Perralderiana, I 

 baetica, I. tegulensis, I. dubia and 7. longissima as forms or sub- 

 species of 7. velata. There is doubtless a complex here, which 

 properly should be solved by those able to work with an abun- 



