[ 77 ] 
ADDENDA. 
XTo 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-flowered ; leaves 
short, flat. Elliot. 
Three-Jlowered 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 villas ; valves short, ovate, obliquely 
pointed, (sometimes producing the appearance of 
marginal serratures), inner valve small, seeds more 
or less spherical. Nutt. 
ERRATA. 
Page 46. In the two last lines of the observation to Crypsis Virginieaj 
omit the words probably introduced.’'^ 
Page 43. Marginal note to No. 6, for landestina read clandestina^ 
Page 55. Add Muhl, to the specific description of No. 2» 
8 * 
