Amaranthiis deflexns \..,A. spinosiis h.,Lepidium medium. Greene, 

 Sinapis alba L., Cleome spinosa L., Pedicellaria pentaphyJla (L.) 

 Schrank, Sesban macrocarpa Muhl., Chamaesyce hirta (L.)Millsp., 

 and Sesamum Indicum L. — elements in the vegetation of the 

 Old World, Tropical America, and the southern and western 

 United States, some of which might be expected to become 

 permanent and, perhaps, undesirable residents. 



From time to time the area was subsequently \'isited and 

 carefully explored, in order to note which of the species had 

 persisted, which had disappeared, and what others new to Staten 

 Island might have been introduced. In 1910 only five of the 

 species previously listed were found; but it is of interest to note 

 that one of these was Sesamum Indicum, a native of Asia and 

 Africa. In 1917 this species was still there, and Melochia 

 corchorifolia L. and Anoda triajigiilaris (Willd.) D.C. were added 

 to the list. In 19 18, I was able to find only four of all the species 

 listed, viz. Chenopodium anthelmintictim, Amaranthus spinosus, 

 Lepidum mediuin, and Sinapis alba; but the following new- 

 comers were noted: Riimex Mexica^ius Meissn., Chenopodium 

 lanceolatum Muhl., and Helianthiis petiolaris Nutt. My last 

 visit was made in September 1921. It was evident that the 

 elimination of species unsuited to the environment was almost 

 complete, and that a vegetation destined to become permanently 

 established there, represented by a relatively few dominant 

 elements, was now the salient feature of interest in the area. 

 Thrifty young trees of Populus candicans Ait., Populus deltoides 

 Marsh., Salix alba L., Betula populi folia Marsh., and AilantJius 

 glandulosa Desf. were growing there; but the most conspicuous 

 feature was the dense stands of Oenothera biennis L. and 

 Ilelianthus annuns L. One patch of the latter covered about a 

 ([uarter of an acre, to the almost total exclusion of everything 

 else — the growth was so close and dense. Elsewhere the mass 

 of the vegetation was made up of our common waste land and 

 garden weeds and coarse grasses. Incidentally the following 

 introduced species new to the Staten Island flora were collected : 

 Persicaria persicarioides (H.B.K.) Small, Pleuropterus Zuccar- 

 inii Small, and Helianthus hirsutus Raf. The first one, so far 

 as I am aware, has not heretofore been recorded growing in our 

 local flora range, and the last one is recorded from the range 

 only from Northampton and Monroe Counties, Pa, 



