VI ADDITIONS AND CORRECTIONS. 



stipitate crown fleshy below, rounded-truncate at the summit, longer than the 

 thickish incurved horn, furnished with a small sharp tooth at the inner mar- 

 gin on each side towards the summit. — Augusta, Illinois, Mead. — Leaves 

 about 4 pairs, 1^ — 2J' long. Fruit not seen; so that it is uncertain 

 whether the species should stand next to A. SuUivantii or A. obtusifolia. 



6. A. Nnttalli^na. This will probably take the name of A. Vaseyi, 

 Carey, ined., Engelm. mss., as it now seems probable that Nuttall's A. lanu- 

 ginosa is the same as Lapham's Acerates monocephala. 



Page 354, to Acerates add : 



1". A. moiioccpliala, n. sp. Lapham in herb. Low (6'- 12' high), 

 rather stout, hirsute ; leaves lanceolate, almost sessile (about 2' long and ^' 

 wide) ; umbel solitary and terminal, peduncled, very many-flowered ; di- 

 visions of the greenish corolla oblong (2J" long), more than twice the length 

 of the calyx, several times shorter than the pedicels ; hoods of the crown 

 sessile at the base of the tube of filaments, strongly concave, oblong, erect, 

 with the obtuse apex somewhat spreading, equalling the anthers. — Prairies 

 of Wisconsin, Lapham, Mr. Cornell. July. — Intermediate in several re- 

 spects between A. viridiflora and A. longifolia ; having the sessile crown of 

 the former, and flowers not larger than those of the latter. Hoods more 

 cucuUate than those of A. viridiflora ; the two small appendages within 

 each, and the still smaller pairs of appendages alternate with the hoods, 

 more conspicuous than in the last-ijamed species ; otherwise very similar. 

 PoUen-massfis also thicker and less club-shaped. — A. longifolia is well dis- 

 tinguished by the raised crown, of broader hoods, much shorter than the 

 anthers, and by the thick and short pollen-masses. — Should Dr. Engel- 

 mann's surmise prove correct (as is most likely), this species will bear the 

 name of A. lanuginosa, Decaisne. 



Page 369, line 21. Enxolus deflexus; the plant here so named, from Albany, 

 is not so, but apparently is Amarantus polygonoides, L., or Amblogyna 

 polygonoides, Eaf. ; the latter genus not distinct enough from Enxolus. 



Page 369, line 25. Euxolus pumilus is prostrate, fleshy, its leaves mostly long- 

 petioled, obovate, and notched at the end. 



Page 388, line 15, &c. Euphorbia obtusata here Includes two species ; viz. the 

 indigenous E. obtusata (Vii-ginia to Illinois and southward) ; and the intro- 

 duced E. platyphylla, L., Vermont to Niagara, &c. (Nat. from Eu.) 



Page 405, line 4. The Kock Chestnut-Oak (var. monticola) should rather be 

 placed under No. 5, Q. Castanea. 



Page 465, line 2, under Medeola : for "base,'' read "middle," and add "ex- 

 trorse ! " For " Styles 3," &c., read : Style none ; stigmas 3, recurved- 

 diverging, long and thread-form. 



Page 598, line 24, for " Sept." read : July- Sept. 



