310 Transactions. — Botany. 



stay on the islands ; none of these have I yet seen, as they were not 

 arranged for distribution. But the Alg^e of Mr. Travers' first collection have 

 been elaborated with masterly knowledge by Professor J. G. Agardh of Lund 

 (in "Ofrirsigt af Kongl. Yetenskaps Akademiens Forhandlingar," Stockholm, 

 1870), and from manuscript notes of Professor Agardh a list of these Algse 

 appeared also in the third volume of the Transactions of the New Zealand 

 Institute, p.p. 213-215. The cotyledonous plants and ferns, now kindly 

 placed at my disposal for examination, as supplementary to those enumerated 

 in my " Sketch of the Vegetation of the Chatham Islands," comprise the 

 following genera new to the group : — Ranunculus, Cardamine, Nasturtium, 

 Lepidium, Yiola, Drosera, Stellaria, Dodonsea, Discaria, Acsena, Callitriche, 

 Tillsea, Haloragis, Myriophyllum, Daucus, Crantzia, Hydrocotyle, Oreomyr- 

 rhis, Apium, Brachycome, Craspedia, Erechtites, Helichrysum, Gnaphaliura, 

 Hypochoeris, Wahlenbergia, Myosotis, Dichondra, Parietaria, Rumex, Atriplex, 

 Rhagodia, Chenopodium, Salicornia, Triglochin, Ruppia, Potamogeton, Acian- 

 thus, Corybas, Thelymitra, Microtis, Schoenodum, Scirpus, Cladium, Chseto- 

 spora, Isolepis, Uncinia, Danthonia, Hierochloa, Trisetum, Dichelachne, Poa, 

 Tmesipteris, Schizsea, Ophioglossum, Lindssea. 



All these genera are represented also in the vegetation of the New 

 Zealand islands. The species and their relations, geographically and phyto- 

 logically, will become the subject of a special treatise. 



The following list of Mosses has been named by Dr. E. Hampe, of 

 Blankenburg : — 



Sphagnum molliculum, Wilson. Rhizogonium bifarium, Schimiyer. 



Funaria connivens, Hampe. Hypnum aviculare, Bridel. 



Dissodon purpurascens (Splachnum Hypnum spininervium, Hook. 

 purpurascens, J. Hook, d' Wils.) Hypnum ramulosum, Mitten. 

 Dissodon cuspidatus (Splachnum Cyathophorum bulbosum, Bridel. 



cuspidatum, J. Hook. <& Wils.) Catharomnion ciliatum, J. Hk. (& Wils. 

 Dicranum trichopyllum, n.s., Hampe. Racopilum australe, G. Mueller. 

 Campylopus introflexus, Bridel. 



Art. XXXIX. — On the Origin in New Zealand of Polygonum aviculare, L. 



By W. T. L. Travers, F.L.S. 



{Read before the Wellington PliilosopMcal Society, 23rd October, 1872.] 



In the fourth volume of the Transactions of the New Zealand Institute, at 

 p. 238, will be found a paper on this subject by Mr. Kirk, written, as it 

 fippears, in consequence of some observations of mine at p. 336 of the previous 



