EEPOET OF THE BOTANICAL EXCHANGE CLUB. 285 



half as long to as long as the fruit. Carpel oblong-fusiform, three- 

 quarters to one line long, strongly muricated on the back. Style 

 nearly or quite as long as the carpel. Stigma large, crenulate. 

 Stamens with a two-celled anther and filament a quarter to half-inch 

 long. This is a not unfrequent coast-form, but I think runs into No. 1 

 by insensible gradations, and a plant gathered by Mr. Warren in 

 Kensington Gardens should apparently be placed here. Here belong 

 Z. maritimaoii Nolte, Z. gihherosa, Eeich. Ic, t. 16, fig. 22 and 23, and 

 Z. pedicellata, Eng, Bot., ed. 3, t. 926. The Z. pedunculata of the 

 " Herbarium Normale " of Fries comes about midway between this 

 and the last. 



3. Z. polycarpa,l^o\iQ; Eeich. PI. Crit., t. 757; Reich. Ic. El. 

 Germ., t. 16, fig. 23. Carpels often 5 or 6. Pedicel none or very 

 short. Carpel cylindrical, under a line long, crenulate on the back. 

 Style not more than one-fifth to one-fourth as long as the carpel. 

 Stigma large, repand. Stamens with a bilocular anther and filament 

 not more than one-eighth to one-tenth inch long. The type has not yet 

 been found in Britain. Dr. Boswell's Orkney plant is this, except that 

 the style is a little longer and the tuberculation on the margin of the 

 fruit is very faint or entirely obsolete, so that it recedes from the 

 type in the direction of No. 1 . 



4. Z. maerostemon, Gay, Z. palustris, Boreau, Fl. du Centre, edit. 

 2, p. 603. Z. digyna, Brebisson. Z. disperma, Salzmann. Ovaries 

 usually two, but sometimes three or four. Pedicel none. Fruit three- 

 fourth to one line long, sausage-shaped, rarely crenulate. Style half 

 as long as the fruit. Stigma small, not crenulate. Stamens 

 with a four-celled anther, and filament from half an inch to 

 an inch long. The only station within the bounds of our flora 

 with which I am acquainted is, ditches of fresh water near the 

 Shannon, two miles west of Wicklow, where it was gathered 

 by Mr. Jno. Ball. It was pronounced to be the true maerostemon by 

 Gay, and a specimen so labelled by the latter is in the Kew Herba- 

 rium. Gay's idea was that 1, 2, and 3 were varieties of one species, 

 but that this was distinct. The figures of 1, 2, and 3 in Reichenbach's 

 " Icones " are excellent, but I cannot refer to any satisfactory figure 

 of this. It is probable that if the matter were taken in hand by the 

 members of the Club, 3 or 4 would be found in fresh places. 

 Nearly all the specimens which I have seen in British herbaria are in 

 the fruiting stage, and we want a supply gathered a month earlier, so 

 as to show the stamens. — J. G. Baker. 



Zannichellia ( ?). " Round Pond, Kensington Gardens, 



Middlesex, July, 1875. This foi-m deserves study. It seems inter- 

 mediate between eu-palustris and pedicellata. The arrangement of the 

 fruits round their common peduncle recalls the former, and even to 

 some extent the Orkney plant distributed this year. But the lengtli 

 of styles and fruit-stalks would bring it rather to pedicellata had 

 it been gathered from brackish, not purely fresh water. (Q,y. Can it 

 be pedicellata carried in here from the Thames and altered by a long 

 colonisation in fresh water?)" — J. L. Warren. As Mr. Warren 

 says, this form is quite intermediate between Z. eu-palustris and 

 pedicellata. It has the capillary leaves, short common peduncle, and 



