386 NasH: ENUMERATION OF THE 
Rio Piedras, Heller 195 and 196; Bayamon, Underwood and 
Griggs 883 ; Santurce, Heller 6380. 
2. CHLoRIS PARAGUIENSIS Steud. Syn. Pl. Gram. 204. 1855. 
Chloris barbatum Sw. F\, Ind. Occ. 1: 200. 1797. Not 
Andropogon barbatum L. Amoen. Acad. 5: 412. 1759. 
Near Mayaguez, Heller 4417. 
28. EUSTACHYS Desv. Nouv. Bull. Soc, Philom. 2: 
188. 1810 
1. EUsSTACHYS 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. 24810 
1. 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 uppe!, 
less than 1 dm. long, 1-2 mm. wide: spikes 3-7, short, spreading 
or reflexed, of 1-3 spikelets, the 3-angled rachis hispidulous 0” 
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, 1-nerved, hispidulous 
on the stout midrib, the first shorter than the second which is 5-® 
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 1 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, 19- 
6057, and distributed as Bouteloua Americana (Sw.) Scribn. The 
Aristida Americana cited in the synonymy of Bouteloua litigiosa 
Lag. by Grisebach (FI. Brit. W. I. 537) is accredited to Swartz 
(Obs. Bot. 4. 2, f. 2). Swartz, however, distinctly indicates there 
the real authorship of the species by quoting the original Linnaean 
