22 LEAFLBTB 



The characters of this genus are well brought out, though 

 under the subgeneric name Echinocaulon, by Meisner, DC, 

 Prodr. xiv. 131. Hasskarl appears to have made more than one 

 attempt to obtain recognition for the group as a genus a little 

 later than the date of Kafinesque's publication of the same 

 opinion. 



Only three species of Teacaulon have been credited to the 

 United States ; two of which are correctly presented by Mr. 

 Small in his admirable book ; but his T. Beyrichianum is 

 doubtless a misapprehension. The real T. Beyrichianum is 

 Brazilian and the plant of our southern borders fails in impor- 

 tant points to answer the description of it. It is P. multangular e, 

 H. & A. Comp. to Bot. Mag. ii. 62, and should be called T. mtjlt- 



ANGULAEE. 



Next of kin to our two familiar species of the Eastern and 

 Southern United States are three North Asian which in their 

 earlier history were confused with ours in nomenclature. They 

 are T. Sibibicum — P. sagittatum Sibiricum, Meisn., T. Sieboldii 

 (Meisn.) founded on P. sagittatum Thunb. and T. Thunbeesii 

 (Sieb. & Zucc.) based on P. arifolium Thunb. Yet a fourth 

 Japanese species is T. hastato-teilobum (Meisn.), and even 

 antipodal Australia and New Zealand have one which was at 

 first confused with our T. arifolium. This is T. STEIGOSUM 

 (K. Br.) 



I subjoin a further list, far from complete, of Tracaulon 

 species of various parts of the world, indicating where they were 

 published under Polygonum : T. Meisn-beiakum (Ch. & Schl. 

 Linnsea. iii. 40), eubeioaule and stelliqeeum (Ch. Linnaea. 

 viii. 130, 131), MUEiCATUM (Meisn. Monogr. 74), peefoliatum 

 (Linn. Sp. 2 ed. 521), pedunculaee (Wall. Catal. n. 1718), 

 PE^TEEMissuM (Hook. f. Brit. Ind. v. 47), hispidulum and 

 TETEAGONUM (Blume, Bijdr. 535), Maackianum (Eegel, Fl. 

 Ussur. 137). 



:More nsily confused with Polygonum, and somewhat similar 

 in asp to such plants as P. tenue, is a small group of Calif or- 

 nian annuals -which the late Mr. Watson segregated under the 

 subgeneric name of Duravia. But the characters of solitary 



