192 



As introduced into cultivation from southern Oregon, this 

 creamy-flowered, glaucous-foliaged plant called D. or eg ana is an 

 undeniably charming thing, by no means easily established in East- 

 ern gardens, where it is likely either to dwindle slowly or, if it 

 "takes hold," to revert to the condition indicated above. Reports 

 of "pink D. oregana" in Oregon and Washington gardens suggest 

 that the reversion takes place in that part of the country as well. 

 Examination of reverted material reveals no differential characters 

 sufficient to distinguish it from the somewhat variable D. jormosa 

 for it has the spreading rhizome, the form of stigma, the short- 

 spreading outer petals, the scarcely protruding inner ones, and 

 flower color characteristic of this species. Since the plant known 

 as D. oregana apparently reverts rather easily to D. jormosa it 

 appears, therefore, to be only a phase of this and not worthy of 

 specific rank. The following nomenclature change is therefore 

 suggested : 



DiCENTRA FORMOSA (Dryand.) Walp., forma or^^a«« (Eastw.) 

 van Melle, comb. nov. 



Dicentra oregana Eastw. Proc. Cal. Acad. Sci. 20: 144. 1931. 



P.O. Box 1178. 



POUGHKEEPSIE, N. Y. 



An Introduced Ladysthumb from Asia 



Harold N. Moldenke 



During recent years a good bit of interest has been aroused 

 among local botanists by the appearance and rapid spread of an 

 Asiatic weed, the bristly ladysthumb, Persicaria longiseta (De 

 Bruyn) Moldenke, comb. nov. [Polygonum longisetum De Bruyn 

 in Miq., PI. Jungh. 307. 1854]. As far as I am aware, it is not listed 

 in any of our current manuals or local floras, although, as will be 

 shown below, it has been in the country for at least thirty-one years. 

 The first published record of its occurrence in America seems to be 

 by Harger et al. in their "Additions to the flora of Connecticut" 

 pubHshed in Bull. Conn. Geol. & Nat. Hist. Surv. 48: 43 (1930). 

 This was followed by a discussion by Dr. S. F. Blake entitled 

 "Polygonum caespitosum var. longisetum in the United States" in 



