ADDITIONS AND CORRECTIONS. 



Page 39, line 14. After " Maine," add : Nuttall. Echo Lake, Franconia, New 

 Hampshire, Tuckerman. 



Page 71, line 23. Linum Boottii; add syn. : L. sulcatum, Ridddl (an older 

 name which has been overlooked). 



Page 78. To Vitis vulpina, add : Bark close, not separating in shreds, as in 

 the other species. 



Page 118. To Potentilla frigida, add habitat: Alpine region of the White 

 Mountains (Robbins) and of Mount Lafayette ( Tuckerman), New Hampshire. 



Page 132. To Jussiaea, add : 



2. J. re peilS, L. Glabrous or nearly so ; stem creeping, or floating 

 and rooting ; leaves oblong, tapering below into a slender petiole ; flowers 

 large, long-peduncled ; calyx-lobes and slightly obcordate petals 5 ; pod 

 cylindrical, with a tapering base. 2J. In water, Illinois, Kentucky, and 

 southward. 



Page 136. Opuntia vulgaris, var. *? Rafinesquii, now distinguished by Dr. 

 Engelmann as a species, under the name of O. Rafinesquii, grows from 

 Wisconsin to Kentucky and southwestward. 



Page 143. To Saxifraga, add : 



9. S. StellariS, L. var. comdsa, Willd. Leaves wedge-shaped, 

 more or less toothed ; scape a span high, bearing a small contracted pan- 

 icle ; many or most of the flowers changed into little tufts of green leaves, 

 the perfect flowers with a free reflexed calyx ; petals unequal, lanceolate, 

 white, with two yellowish spots on the base, which is narrowed into a dis- 

 tinct claw. Mount Katahdin, Maine, Rev. J. Blake. 



Page 169, after line 13 from bottom, add : 



9. POLYPREMUM. Corolla and single style very short. Pod many-seeded, locu- 

 licidal. Leaves slightly connected at the base, very narrow. 



Page 174, add: 



9. POLYPREMUM, L. POLYPREMUM. 



Calyx 4-parted, persistent ; the divisions awl-shaped from a broad scari- 

 ous-rnargined base. Corolla not longer than the calyx, almost wheel- 

 shaped, bearded in the throat ; the 4 lobes imbricated in the bud. Stamens 



