386 Nash : Enumeration of the 



Rio Piedras, Heller 195 and 196; Bayamon, Underwood and 

 Griggs 883 ; Santurce, Heller 6380. 



2. Chloris Paraguiensis Steud. Syn. PI. Gram. 204. 1855. 



Cliloris barbatuni Sw. Fl. Ind. Occ. i : 200. 1797. Not 

 Atidropogon barbaUnii L. Amoen. Acad. 5 : 412. 1759. 



Near Mayaguez, Heller 4417. 



28. P:USTACHYS Desv. Nouv. Bull. Soc. Philom. 2 : 



188. 1810 



I. Eustachys petraea (Sw.) Desv. Nouv. Bull. Soc. Philom. 2 : 

 189. 1810. 



In sand, Vega Baja, Heller 131 ; Santurce, Heller 6422. 



29. HETEROSTECA Desv. Nouv. Bull. Soc. Philom. 



2: 188. 1810 



I. Heterosteca rhadina sp. nov. 



Stems tufted, 2.5-4 dm. long, slender, finally prostrate at the 

 base and branching above : leaves several ; sheaths strongly nerved, 

 glabrous, or the lower ones sometimes more or less pubescent ; 

 ligule a narrow scarious ring ; blades flat, narrowly linear, acumi- 

 nate, more or less hirsute on both surfaces, especially on the upper, 

 less than i dm. long, 1-2 mm. wide : spikes 3-7, short, spreading 

 or reflexed, of 1-3 spikelets, the 3-angled rachis hispidulous on 

 the angles, its internodes long, usually exceeding one half the 

 length of the empty scales : spikelets distant, appressed to the 

 rachis, the purple empty scales very acute, i -nerved, hispidulous 

 on the stout midrib, the first shorter than the second which is 5-6 

 mm. long, the first flowering scale 3-nerved, the nerves extending 

 into short awns, the lateral ones barely reaching the apex of the 

 body of the scale, the central one extending about i mm. beyond 

 it, enclosing a perfect flower and a palet longer than its body, the 

 second flowering scale likewise 3-nerved, the nerves extending 

 into hispidulous awns longer than the body, enclosing a staminate 

 flower and a longer palet. 



Collected on the Adjuntas road, near Ponce, by Heller, no. 



6057, and distributed as Bouteloiia Americana (Sw.) Scribn. The 



Aristida Americana cited in the synonymy of Bouteloua litigiosa 



Lag. by Grisebach (Fl. Brit. W. I. 537)'is accredited to Swartz 



(Obs. Bot. t. 2, f. 2). Swartz, however, distinctly indicates there 



the real authorship of the species by quoting the original Linnaean 



