KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 175 



I have not seen fruit of this form. Possibly we have here a form of higher 

 systematic vahie. Possibly it stands in any relation to P. similis Benn. which I 

 have not yet had an opportunity to study. It is said to have 3—5 longitudinal 

 nerves in the submersed leaves. The styles and stigmas are not described. In f. 

 tasmanicus they do not deviate from P. Cheesemanii so much that a specific difference 

 can be founded on them. P. similis seems to me to be most probably referable 

 to the Muricati on account of the fruits (»tricarinate with the three margins sinuous- 

 winged^ etc.: Bbnn.), 



Distribution of the species. New Zealand, St. John's Lake, N. Isl., 81, Chee- 

 SBMAN (hb. Stockholm., Det. & comm. Ar. Bennett); Lake Pearson, Ins. bor., 74, 

 Bbrggeen (hb. Stockholm, et Uppsal.); Ponds, Nelson; S. Isl., 69, Travees (hb. 

 Stockholm, et Uppsal.), f. coryrnboides ; Hokianga, Ins. bor., 74, Berggren (hb. Lund), 

 f. frondosus; Lake Takapo, S. Isl., 83, Cheeseman (hb. Stockholm.) »alt. 2500 feet» 

 Det. & comm. Ar. Bennett. Tasmania, R. C. Gunn (hb. Stockholm.), f. tasmanicus. 



Subsectio 20. Colorati (Graebn.). 



Caulis ut in prsecedente v. rarissime ± ramosus. Folia superior a tenuia — 

 semicoriacea — coriacea; submersa membranacea ± petiolata; ligulse ± caducse. Pi- 

 stillum parvum stylo brevi valde incrassato stigmate parvo ovali-rotundato. Fructus 

 minores saepe erostrati ± carinati. Anatomia caulis: fasciculi vasculares tubi cen- 

 tralis in medio quattuor sejuncti, laterales terni vel plures. Endodermis, vide infra! 



The characteristics of this group are the swollen styles (Fig. 92 E), small stig- 

 mas, and small fruits with insignificant beak and in fresh without or nearly without 

 keels. The upper leaves are often thin and proper coriaceous floating leaves are 

 late developed, usually first on the stem-prolongation, in contradistinction to the 

 next foregoing groups, but more corresponding with the Alpini, a contrast of which, 

 nevertheless, this group is by the form of the styles. The turios consist of but little 

 differentiated leafy shoots. The anatomy of the stem is characterized by an endo- 

 dermis of mixed 0- and ?7-cells (or, a tendency of producing tt-cells), by which the 

 group approaches the Natantes. 



Of the species hitherto known only P. polygonifolius and P. coloratus properly 

 belong to this group. As an appendix, and ad interim, I have here included the 

 new-established P. promontoricus m., which is likely to be a capensis-hjhvid, also 

 much reminding of some Amplifolii as to style and stigma. P. semicoloratus seems 

 to combine the Colorati with the Amplifolii. The position of P. australiensis is not 

 fully known, and the same is the case with P. parmatus (p. 152) and P. suboblongus m. 



P. polygonifolius Pourret. 



Extrait de la Chloris Narbonensis etc., in Memoires de I'Academie de Toulouse, 

 III, 1788, 325. — P. oblongiis Viviani, Annales botanici, I: 2, 1802, 102. — P. Plan- 



