[ rt ] 



ADDENDA. 



(To be added to the genus No. 52. p. 57.) 



No. 4. Aira triflora, Elliot. 



panicle slender, erect ; valves of the calix 

 acute ; the upper spikes 3-flo\vered j leaves 

 short, flat. Elliot. 



Three-flowered Hair-grass. 



About fourteen inches high. Grows with Aira obtusata, 

 but more rare. In Jersey. Perennial. April, May. 



Genus Poa, No. 54, page 58, the species No. 3. 5. 9. 12. 

 13. are to be referred to a section as follows : 



Brizoma. Spiculi erect, closely imbricated, flower 

 glumes often angularly 3-nerved ; without a con- 

 necting villus ; valves short, ovate, obliquely 

 pointed, (sometimes producing the appearance of 

 marginal serraturesj, inner valve small, seeds more 

 or less spherical. Nuit. 



ERRATA. 



P«pe 46. b thi- two la*t Imr* of the observation to Crypsis Virginica, 

 omit ih>- v>ovi\\" tnu'iably introducut.'' 



Pmf. 13, M irginal not« H H >. 6. for landestina nail cinndettina- 

 P»£t 55. Add Muhl. to the- ipflfiflu description oi No. 2. 



8* 



