13-4 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Chatham Isl. : southwest end, upper region, Baur, no. 286 (lib. Gr.). 

 Endemic. 



P. uncinatum, nov. sp., glabrum lignoso-carnosum ; caulibus tereti- 

 bus olivaceo-viridibus dichotomo ramosis; ramis arcuatis etiam teretibus 

 gracilibus ; internodiis elongatis ; foliis oppositis breviter petiulatis 

 lanceolatis vel ovati-laueeolatis integris 5-nervatis margine ad apicem 

 falcato-uncinatam revoluta basi cuneata ; spicis in dichotouiis terminalibus 

 elongatis saepius 7-nodosis ; floribus 4-seriatim imtnersis ; calycis segmen- 

 tis late deltoideis obtusis. — Narborough Isl. : southern part, common 

 on " palo santo " and coffee trees, at 300 to GOO m. alt., April, 1899, 

 Snodgrass & Heller, no. 325 (lib. Gr.). Endemic. Leaves 7 cm. 

 loug, 1.6 to 2.3 cm. broad. Spikes 7 cm. long, segments 1.5 cm. long; 

 sheath short, sharply 2-pointed. Plate 1, fig. 1. 



POLYGONACEAE. 

 Polygonum, L. 



P. acuminatum, HBK. Nov. Gen. & Spec. ii. 178 (1817); Meisn. 

 in Mart, El. Bras. v. pt. 1, 14, t. 4, & in DC. Prodr. xiv. 114; Griseb. 

 Fl. Brit. W. Iud. 161 ; Small, Monog. Gen. Polyg. 52, t. 13.— 

 Galapagos Ids.: ace. to Griseb. 1. c. Further distrib. trop. S. Am., 

 Centr. Am., W. Ind. 



P. galapagense, Caruel (1), 624. — Chatham Isl. : Chierchia 

 (hb. Kew.). Endemic. 



CHENOPODIACEAE. 

 Atriplex, L. 



A. sp. — Indefatigable Isl. : northern part, Snodgrass & Heller, 

 no. 676 (hb. Gr.). Seymour Isl.: north, Snodgrass & Heller, no. 

 571 (hb. Gr.). 



A. sp. — Wenman Isl. : Snodgrass & Heller, no. 9 (hb. Gr.). 



AMAPvANTACEAE. 



Alternanthera, Forsk. 



A. radicata, Hook. f. (4), 261, 262 ; Anderss. (1), 164, & (2), 60, 

 t. 3, f. 2. — A. acaulis, Anderss. (1), 164. — Chatham Isl. : Darwin; 

 in upper very dry region, Andersson (hb. Gr.). Hood Isl.: Snod- 

 grass & Heller, no. 753 (hb. Gr.). Endemic. 



