116 PROCEEDINGS OF THE AMERICAN ACADEMY. 



As to robustness and leaf-breadth the Galapageian specimen at hand 

 appears to correspond most closely to the form P. Vaillantii, Roem. 

 & Schultes, Syst. iii. 514 (1818), which is intermediate between the 

 very slender typical form and the broad-leaved form which is often 

 separated as P. zosteraceus, Fries, Nov. ed. 2, 51 (1828). 



Ruppia, L. 



R. maritima, L. Sp. 127 (1753) ; Reichenb. Ic. Fl. Germ. vii. t. 17, 

 f. 26. — Albemarle Isl. : Elizabeth Bay, lava fields near the beach, 

 Snodgrass & Heller, no. 938 (hb. Gr.). "Widely distributed. A species 

 not hitherto recorded on the Galapagos Ids. 



NAJADACEAE. 



Najas, L. 



N. marina, L., var. latifolia A. Br. ex Schum. in Mart. Fl. Bras, 

 iii. pt. 3, 725 (1894); Rendle, Trans. Linn. Soc. ser. 2, v. 396, t. 39, 

 f. 11. JSf. latifolia, A. Br. Journ. Bot. ii. 276 (1864). — Albemarle 

 Isl. : Iguana Cove, Snodgrass & Heller, no. 940a (lib. Gr.). The 

 material at hand varies somewhat as to the arming of the internodes. 

 In some instances they are smooth, as in var. latifolia ; in other stems 

 they are rather conspicuously armed. There is reason to believe that 

 this is individual variation, and the long rather broad many-toothed 

 leaves are those of var. latifolia. Further distrib. trop. S. Am. 



GRAMINEAE. 



Anthephora, Schreb. 



A elegans, Schreb. Beschr. Griis. ii. 105, t. 44 (1810); Kunth, 

 Enum. i. 169; Anderss. (1), 141, & (2), 48; Rob. & Greenm. (1), 149. 

 ? A. cuspidata, Anderss. 11. cc. (differences not greater than in the 

 various continental forms, which have not yet been successfully sepa- 

 rated). — Charles Isl.: Andersson (hb. Gr.) ; Baur, no. 346 (hb. 

 Gr.), subglabrous form. Chatham Isl. : northern part, Baur, no. 

 347 (hb. Gr.), also subglabrous. Indefatigable Isl. : Andersson 

 (form A. cuspidata). James Isl. : on James Bay, Snodgrass & Heller, 

 no. 397 (hb. Gr.). Further distrib. Mex., W. Ind., S. Am. 



Aristida, L. 



A. divdlsa, Anderss. (1), 143, & (2), 49; Rob. & Greenm. (1), 149. 

 — Alingdon Isl. : Snodgrass & Heller, no. 809 (hb. Gr.). Bindloe 



