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. l' 2^' long. Fruit not seen; so that it is uncertain 

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



6. A. Nuttalliana. 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 : 



l a . A. monocephala, 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 (2" 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 

 cucullate 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-named species ; otherwise very similar. 

 Pollen-masses 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. Euxolus deflexus; the plant here so named, from Albany, 

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

 polygonoides, Raf. ; the latter genus not distinct enough from Euxolus. 



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 (Virginia to Illinois and southward) ; and the intro- 

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



Page 405, line 4. The Rock 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- 

 di verging, long and thread-form. 



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



