BOTANICAL GAZETTE. 107 



vance sheets," containing the results of work upon some of the most 

 perplexing gn.ups. We will note some of the most important things 

 in passing, merely giving what would catch a botanist's eye in turn- 

 ing over the pages In Vernonia the principal change from Torrey 

 and Gray's Flora is the restoration of V. aliissiina, Nutt., standing 

 between V. fasckulata and V. Balduniiii or Noveboracensis. A new 

 species appears under the name of V. Leftcrmaimi, Eng., from Arkan- 

 sas. 



Aplopappus intcgnfoliiis, T. C. Porter, is taken up from an un- 

 published name of a plant collected by the writer m Wyoming in 

 1872, and three new species are added. 



SonDAGO is divided mto three primary sections or subgenera, 

 viz.: Virgaurea, Eiithamia, and Clirysoma. The Chrysastruin section 

 of Torrey and Gray is reduced to a subsection of the first, and is 

 made to include ^V. petiolaris. 



The southwestern genus Aphanostf:phus has now five recognized 

 species which Dr. Gray arranges and characterizes. 



A new genus of the Asteroideous CompositiE is proposed under 

 the name of Greenella, m honor of Rev. E. L. Greene, and the 

 single species is G. Arizonica. 



Ch/etopappa, DC., is made to include Distasis, DC. The 

 Rocky mountain genus Townsendia which has so long perplexed us 

 appears fresh from Dr. Gray's hands in the form of a most satisfacto- 

 ry synopsis, and 3 or 4 new species are added. The genus now con- 

 tains 17 species. 



Then follows a synopsis of the genus Erigeron, which "shades 

 off into Aster in more than one direction; and its subgenus Comotus 

 fairly runs into Conyza. It can be limited only by taking into account 

 a combination of characters, and insisting here upon one, there upon 

 another. The general differences between it and Aster 2i.xt found, — i. 

 in the simpler involucre, of equal neither foliaceous nor appendiculate 

 narrow bracts; 2. in the very numerous and narrow rays of the typ- 

 ical species ; 3. in the very short, broad, and obtuse style-appen- 

 dages ; 4. simpler stems, naked above or with few more pedunculate 

 heads; 5. less copious and more fragile pappus ; 6. smaller achenia; 

 their nervation is of less importance, but mostly there are only the 

 marginal nerves." The three primary sections are Euerigenm ; Tri- 

 morp/uea, and Ccrnotus, the first containing 51 species, the second 3, 

 the third 5. 



"Aster. The revision of this vast genus is not yet completed, 

 0'\ing to the great difficulty which is experienced in settling the sy- 

 nonomy and the limus of some of the earlier as well as ot the later 

 known species. It is intended to accept the genus in the wide extent 

 assigned to it in the (renera Plantarum of Bentham and Hooker, at 

 least so far as North America is concerned, and also to include 

 Braehyactis. The subgenera may be arranged in two series; the first 

 of perennials, the second of annuals and biennials ; and an endeavor 

 has been made to dispose of the perennial Asters under the following 

 subgenera: Amellastrum ; Megalastrum, which connects the genus 



