i 



Guniiera.'] XLV. halokageje. 491 



1. G. cordifolia^ IIool\f, FL Tasm. i. 125. A small succulent fleshy 

 herb, with a tufted rootstock, emitting creeping stolons, loosely hairy on the 

 scapes and the edges and ribs of the leaves. Leaves radical, broadly ovate or 

 orbicular, ^ to 1 in. diameter, crenate and sometimes oI)seurely lobed, on pe- 

 tioles nearly as long as the lamina. Scapes usually unisexual, the males at- 

 taining 2 or 3 in. J bearing in their upper half clusters of flowers, which appear 

 to consist each of 2 thick ovoid anthers, about 1 line long, surrounded by 4 

 or 5 linear or spathulate, slightly jagged bracts, the calyx-teeth so minute as 

 to be difficult to find. Occasionally there are a few female flowers below the 

 rhachis, but usually the females are upon separate scapes, nearly sessile, in a 

 short dense almost globular head. Calyx-tube narrow, about \ line long, the 

 lobes short. No petcds or stamens. Styles almost filiform. Drupes ovoid, 

 slightly compressed, about 1 line long, with 4 ribs of which 2 more prominent. 



Milligania cordifolia, Hook. f. in Hook. Ic. Pi. t, 299. 



Tasmania- Abundant about springs and iu marshes in alpiae situations, /. D^ 

 Eook€)\ 



6. CEEATOPHYLLUM, Linn. 



Flowers unisexual, wittout any perianth, the males consisting of several 

 (12 to 20) almost sessile anthers, the females of a 1-celled ovary, with 1 pen- 

 dulous ovule and a simple filiform style. Fruit an oval uut, tipped by the per- 

 sistent style and often bearing 2 or 4 reflexed prickles or surrounded by a 

 toothed or crest-like wing.— Aquatic floating herbs. Leaves whorled, divided 

 into linear dichotomous segments. Flowers small, axillary, each one sur- 

 rounded by a whorl of minute bracts. 



The genus is found in fresh waters in most parts of the world, and like CalUtriche, is con- 

 sidcred by some as containing hut one species, hy others divided iuto several, characterized 

 by the excrescences on the rine fruit. The Australian form is one frequeut both in Jiurope 



and E. India. 



1. C. demersum, Linn. ; DC. Prod. iii. 73. A glabrous perennial, 

 floating like the submerged species of Myriophjllum, and the leaves wliorJed 

 in the same manner, but dicliotomously, not piunately, divided into linear 

 segments either fine and subulate or rather broader and denticuUite ±lowei;3 

 small, sessile in the axils; Anthers of the males oblong, raucronate. Iruit 

 in the Australian specimens ovoid, slightly compressed, 2 to d lines ong, 

 more or less covered with minute tubercles, the margin not winged but bear- 

 ing below the middle 2 to 4 reflexed prickles, very variable m length.— 0. mb- 

 niersum, Linn. ; DC. 1. c. 



Queensland. Suttor and Burdekiu rivers, F. Mueller, 



S. Australia. Murray river, F. Mueller. „^„„n :„ +!,<. „nrtliprii 



^ The very few fruits I have seen correspond to a form not ^"'=°'f J'°" "^ ^^^^ ^"'^^'"'^ 

 Wisphere, and figui-ed in Wight, Ic. t. 1948, f. 3, as C. tuberculatum, Cham. 



7. CALLITRICHE, Linn. 



of a sinjrle 



Flowers unisexual, without any perianth, the males consisting ot a sing 

 stamen, with a conspicuous filament and small 4-celled anther, the female of 

 » sessile or stalked 4-celled ovary, with 2 filiform erect or ^-^^l^^f ^^*;> ^^ ^^; f /£ 

 ttiatic from the base ; ovules 1 in each cell, laterally suspended from near the 



