HITCHCOCK AND CHASE GEASSES OF THE WEST INDIES. 381 



Cuba, Jamaica, Santo Domingo, Porto Rico (the south and west coasts and on 

 Vieques), St. Thomas, St. Croix, St. Jan, Antigua, Montserrat, Guadeloupe, 

 Dominica, Martinique, Barbados, St. Vincent, Grenada, and Tobago. 



4. Bouteloua heterostega (Trin.) Griffiths, Contr. U. S. Nat. Herb. 14: 414. 

 1912. 



Heterosteca juncifolia Desv. Nouv. Bull. Soc. Pliilom. Paris 2: 188. 1810. 



Eutriana heterostega Trin. Gram. Unifl. 242. 1824. 



Bouteloua humboldtiana Griseb. Mem. Amer. Acad. n. ser. 8: 532. 1862. 



Bouteloua porphyrantha Wright, Anal. Acad. Cienc. Habana 8: 201. 1871. 



Heterosteca rJiadina Na.sh, Bull. Torrey Club 30: SS6. 1903. 



Similar to the preceding, the blades longer, the spikes broader, usually 

 shorter, the spikelets more closely arranged. 



Open ground. West Indies. Originally described from the Antilles, Heteros- 

 teca juncifolia and Eutriana Jieterostega being typonyras. The type of Boute- 

 loua humboldtiana is from Cuba (Wright 734, 739) ; the type of Heterosteca 

 rhadina is from Porto Rico (Hcllvr 6057). Bouteloua porphyrantha was based 

 upon Wright 739 in part, 734, and 3816. Griffiths (loc. cit.) selects the first 

 specimen as the type. 



Cuba, Haiti, Santo Domingo, and Porto Rico. 



.5. Bouteloua disticha (H. B. K.) Benth. Journ. Linn. Soc. Bot. 19: 105. 1881. 



Polyodon distichum H. B. K. Nov. Gen. & Sp. 1: 175. pi. 55. 1816. 



Culms elongate, straggling ; leaves mostly clustered toward the base ; spikes 

 numerous, approximate in long terminal and axillary racemes. 



Open ground and dry hills. Pacific coast of Central America to Ecuador ; 

 also in the vicinity . of Habana, Cuba, where it is apparently introduced. 

 Originally described from Ecuador. 



82. TRIPOGON Roem. & Schult. 



Spikelets several to many-flowered, sessile, erect in a single spike ; glumes 

 shorter than the lowermost floret ; lemmas awned from between the lobes of 

 the minutely two-lobed summit. 



1. Tripogon spicatus (Nees) Ekman, Ark. ffir Bot. 11*: 36. 1912. 



Bromus spicatus Nees, Agrost. Bras. 471. 1829. 



Tricuspis simplex Griseb. Mem. Amer. Acad. n. ser. 8: 532. 1862. 



Leptochloa spicata Scribn. Proc. Acad. Phila. 1891: 304. 1892. 



A low, densely tufted perennial, the subfiliform leaves aggregated at the base, 

 the slender culms erect, spikelet-bearing for one-third to half their length. 



Sterile hills, Texas to Argentina ; also in eastern Cuba ( Wright 1551, the type 

 of Tricuspis simplex). Originally described from Brazil. 



83. ELEUSINE Gaertn. 



Spikelets several to many-flowered, deasely imbricate in thick spikes, these 

 subdigitate ; glumes and lemmas with thickened 5-nerved keels, acute ; caryopsis 

 with a thin pericarp marked with fine transverse lines. 



1. Eleusine indica (L.) Gaertn. Fruct. & Sem. 1: 8. 1788. Goose grass. 



Cynosurus indicus L. Sp. Pi. 72. 1753. 



A weedy annual with spreading or ascending flattened branching culms, thin 

 flat linear blades, and 2 to several spikes (sometimes one spike 1 to 3 cm. 

 below) 5 to 10 cm. long. 



Open ground and waste places. A common weed of warm and warm-tem- 

 perate regions. Introduced in America; originally described from India. To 



