252 NOTICES OF BOOKS AND MEMOIRS. 



UiiNied' oisjJKs X obtusifoUus (B. pratensis, M. & K. ) 

 ,, ,, X nemorosus. 



,, ,, X domesticus (7?. conspersus, Hartm.) 



,, com/lo)iwratns X maritimns (forma Warrenii). 

 ,, ,, X si/lvestris. 



Of these 1\. pratemis [cyispo-oJ)tusifolim) is by far the most common. 

 This is an exceedingly variable iDlant, showing a series of forms 

 completely connecting its two supposed parents. Probably the 

 plants are often again crossed by either crispus or ohtusifuHus, and 

 secondary hybrids result ; it is convenient for further distinguish- 

 ing these forms to call them crispo-pratensis or ohtusifoUo-pratensis." 

 — H. Trimen, 28th February, 1879. 



Wolifia (trh'na. A good supply this year from a new station, 

 a pond near the canal between Hanwell and Brentford, Middlesex, 

 G. Nicholson. 



Potamixjeton Zizii, C. & S. A plant sent by Mr. Brotherston 

 from Cauldshiels Loch, near Melrose, Eoxburghshire, matches 

 German specimens so labelled in the Kew herbarium by Dr. 

 A. Braun. P. Zizii appears to be a large deep-water form of 

 heteroplnjUm, simulating P. lucens in general habit, and destitute of 

 floating leaves. The same ^Dlant is in Borrer's herbarium from 

 Llyn Maclog, in Angiesea, gathered by Wilson. 



Zannlchellia pohjcarpa. Brackish ditch in the Peoples' Park 

 at Belfast, S. A. Stewart. An interesting addition to the Irish flora. 



Zostera aiu/ustifolia. Dr. Trimen points out that a plant 

 gathered ])y Mr. Waterfall at Plymouth, and labelled Z. nana, .is 

 properly an(/u.stifolia, and that the true nana, of which Mr. Ralfs 

 has sent a good supply from Cornwall, may be readily distin- 

 guished in the absence of flowers by its strictly 1 -nerved leaves. 



" Iris Pseudo-Acorns, Boreau, Flore du Centre de la France. 

 (Z. Pseudacorus, Linn., var. (/enuina, Syme Eng. Bot.) Banks of 

 Thames, Kew, Surrey, and fish-pond, Sion House, Isleworth, 

 Middlesex. This is a very distinct Iris, and easily distinguished 

 from the prevailing form (I. acorifonuis, Boreau, with which it 

 is probably frequently confounded) b}^ the following characters : — 

 /. Pseudacorus-, Boreau. Outer periauth-segments of a uniform 

 clear yellow colour ; blade broadly obovate ; claw rather short ; 

 stigmas long and narrow. — I. acoriformis, Boreau. Blade of 

 outer perianth segments nearly orbicular, a deeper blotch at base ; 

 claw long, greenish yellow marked with prominent violet-purple 

 veins ; stigma shorter and broader than in last-named, and the 

 yellow of the flower almost a shade less deep." — G. Nicholson. 



Carex pxinctata. Dr. Trimen XDoints out that a i^lant so labelled, 

 gathered by Mr. Stewart on rocky shore at Dingle, Kerry, is 

 properly a small form of distans. 



JJronnis Jjenckeni. " Garden grown; root from Eaton Bisho]3, 

 Herefordshire, July, 1878, A. Ley. This appears to be correctly 

 referred to 77. P.enckeni, Laiige, diftering from that plant mainly in 

 its greater luxuriance and more ample panicle, the result 2)robably 

 of garden cultivation. Sx^ecimcns of the original wild plant, 

 with notes on its locality and distribution, would be of great 

 interest." — H. Trimen. 



