HITCHCOCK AND CHASE GEASSES OF THE WEST INDIES. 289 



1. Anthephora hermaphrodita (L.) Kuntze, Rev. Gen. PI. 2: 759. 1891. 



Tripsncum hei-maphroditum L. Syst. Nat. ed. 10. 2: 1261. 1759. 



Anthephora elegans Schreb. Beschr. Gras. 2: 105. 1810. 



Cenchrus laevigatus Trin. Fund. Agrost. 172. 1820. 



Anthephora villosa Spreng. Neu. Entd. 3: 14. 1822. 



A leafy ascending or decumbent branching annual with flat thin blades, the 

 erect spikes 5 to 10 cm. long. 



A common weed throughout the West Indies and other parts of tropical 

 America. Originally described from Jamaica. Anthephora elegans was de- 

 scribed from Jamaica. Cenchrus laevigatus is a change of name for A. elegans. 

 Anthephora villosa, described from " India occidental!," is the pubescent form. 



21. NAZI A Adans. 



Spikelets in clusters of 2 (in our species), their flat faces contiguous, their 

 second glumes outermost, strongly convex, covered with stout uncinate spines. 



1. Nazia aliena (Spreng.) Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 17: 28. 

 1899. 



Lappago aliena Spreng. Neu. Entd. 3: 15. 1822. 



Tragus berteronianus Schult. Mant. 2: 205. 1824. 



A low spreading annual with flat ciliate blades and spikes of small crowded 

 burs. 



Open arid ground, southwestern United States and the West Indies to Brazil, 

 whence originally described. The type of Tragus berteronianus was from 

 Santo Domingo. 



Cuba, Jamaica, Haiti, Santo Domingo, Porto Rico, St. Thomas, St. Croix, 

 St. Kitts, and Antigua. 



22. LEPTOTHRIXJM Kunth. 



Spikelets solitary ; glumes much exceeding the single minute floret, the tips 

 diverging, the first subulate, not at all clasping, the second laterally compressed 

 above ; pedicel falling with the spikelet, forming a pointed callus. 



1. Leptothrium rig'idum Kunth, Rev. Gram. 1: 156. 1829. 



Zoisia rigida Willd. ; Kunth, R6v. Gram. 1: 156. 1829, as synonym of Lep- 

 tothrium rigidum. 



A densely tufted perennial 30 to 40 cm. tall, with slender rigid short-jointed 

 culms branching toward the summit, short stiff divergent blades, and partially 

 included spikes of narrow spikelets along a slender axis, at first erect, becoming 

 divergent or reflexed. 



In sand along the seacoast, Palisadoes, Jamaica, and Santa Marta, Colombia. 

 Originally described from "America calidior." 



23. ARUNDINELLA Raddi. 



Spikelets short-pedicellate In large panicles ; glumes acuminate, the tips widely 

 spreading, the second longer than the first and the sterile lemma ; fertile lemma 

 minute, bearded on the callus, bearing a long slender awn fi-om the apex. 



Awn tightly twisted below, the column shorter than the second glume. 



1. A. confinis. 

 Awn not tightly twisted below, the part below the bend exceeding the glume. 



Blades broad and flat, 1 to 2 cm. wide ; plants robust, 1.5 to 2 meters tall ; 



sheaths appressed-villous 2. A. deppeana. 



Blades narrow and more or less folded or convolute ; plants slender, mostly 

 less than 1 meter tall ; sheaths usually smooth 3. A. berteroniana. 



