180 PROCEEDINGS OF THE AMERICAN ACADEMY 



Br.), has been noted, which Australian species has blunter and much 

 more strongly nerved glumes ; it is also smoother, and the awns of the 

 still more villous flowering glume are plumose nearly to the summit. 



Pappophokuji apeutum, Munro in herb. ; Srribner, Bull. Torr. 

 Club, 9. 148. Glabrous or nearly so, except the villous throat of the 

 sheath, erect or geniculate at base, 2 or 3 feet high : panicle close and 

 spike-like or at length somewhat open, 4 to 9 inches long ; spikelets 

 4-5-flowered, the uppermost flowers abortive: lower glumes very thin 

 and scarious, 1-nerved, acutish, irregularly 2-3-toothed at the apex ; 

 flowering glume with 5 green nerves above, irregularly cleft into about 

 15 naked awns, which are scarcely twice longer than the undivided 

 base (a line long). — At Parras (1360) and Monclova, Coahuila 

 (1362). Near P. alopecuroides, Vahl, which has naked sheaths, still 

 longer panicles, longer acuminate glumes, and smaller flowers, the 

 slender awns several times longer than the short base. 



Triodia pulchella, HBK. (^Tricuspis pulchella, Torr.) At 

 Parras, Coahuila (1359), and at San Luis Potosi (1007 Schafifner) ; 

 951 Parry & Palmer. 



Triodia avenacea, HBK. Running freely. At San Luis Potosi 

 (1008 SchafFner) ; 950 Parry & Palmer. Also a taller erect form, 

 described as not stoloniferous ; same locality (1009 Schaffner). 



Triodia mutica, Beiith. ( Tricuspis mutica^ Torr. Uralepls pi- 

 losa and 11. elongata, Buckl.) Mountains west of Saltillo (2020). 

 What has been named " Tricuspis trinerviglumis, Munro," appears to 

 be in every respect the same. 



Triodia Texana. {Tricuspis 7^earona,Thurb. in herb.) A slen- 

 der erect cespitose perennial, 2 feet high, more or less pubescent 

 throughout with short spreading hairs, the nodes glabrous : leaves 

 very narrow (a line broad or less), the sheaths villous at the throat: 



§ 3. Triathe)-a, Benth. Spikes several, short and narrow, the 1 to 3 slender 

 spikelets closely appressed to the rhadiis : terminal glume reduced to a triple 

 awn. 



21. B. ARiSTiDoiDES, Thurb. From New Mexico to Southern California and 

 Mexico. 



22. B. TRiATHERA, Benth. {Tricena racemosa, IIBK., 1. c, t. 61.) Mexico. 

 (Not seen.) 



§ 4. Polyodon, Benth. Spikes few, short, of few spikelets : flowering glume 

 3-awned, the 2 or 3 terminal empty ones crowded together and each 3-5- 

 awned. 



23. B. Texana, Watson. Texas. See page 196. 



24. B. DisTiCHA, Benth. {Poh/odon dislirhnm, HBK., 1. c, t. 55.) Peru. 



25. B. multiseta, Benth. Brazil. (These not seen.) 



