493 XLV. HALOUAGE^. [CaUllriche. 



summit of the cell, rruit small, more or less flattened, notclied at the top, 

 4-Ci lied and 4-lobed3 that is surrounded by a double edge, the edges obtuse 

 acute or winged, and consisting of 2 2-celled disk-shaped carpels, united by 

 their inner faces. Embryo in the axis of an oily albumen.— Slender aquatic 

 herbs. Leaves opposite, entire. Flowers axillary, solitary or a male and female 

 from the same axis, each one between 2 small bracteoles, which are somethnes 

 \vanting. 



The genus is found in almost every part of the gloLe, and, according to some lotanisls, con- 

 sists but of a single species, others divide it into two, the Australian one belonging m that 

 case to the one which has the most universal geographical range. Those who variously extend 

 the genus to from 13 to 20 species, describe the commonest Australian form as endemic. 



1. C. verna, Linn.; DC. Prod. iii. 70. A ghibrous slender perennial, 

 either floating in water or creepnig and rooting in mud, tlotvering young so as 

 to appear annual, varying iri length according to the depth of the water. 

 Leaves either all obovate-orbicular or oblong, 1 to 6 lines long or the lower 

 submerged ones narrow-linear and obtuse or notched at the end, the upper | 



ones obovate and spreading in little tufts on the surface of the water, or all 



submerged and linear; l^lowers minute: Fruit from i to 1 line diameter, 

 with obtuse acute or winged edges. — C. autumnalis, Linn;; DC. 1. c, partly at 

 least. 



Queensland. Brisbane river, F, Mueller, 



W. S. "Wales. Port Jackson to the Blue Mountains, R. Brown, and others. 

 Victoria. Abundant In pools, Adamson^ P. Mueller^ and others. ^ 



Tasmania. Port Dalrymple, K Brown; commoti in still freshwater, margins ot 



rivers, etc., /. B. Hooker: 



S. Australia- Plenty river, towards Mount Disappointment, F, Mueller, 



^V. Australia^ Drummond, n. 185, 2nd Coil, n, 09 {or 66). 



The Eastern specimens have generally the wings of the fruit broader th'nn in almost any 

 Northern or tropical specimens, and constitute the C wacrojiieryx, Hepelm. Monogr. Callitr. 

 59; the Westfern atid sonre of the Tasmanian specimens cannot be distinguished from some 

 of our European forms ; in Brown's Tasmanian ones the fruit lobes are quite obtuse on l 

 edge. 



k t 



Okder xlvi. rhizophoee^. 



Calyx-tube usually adiiate to the ovary, sometimes prolonged above it or 

 rarely quite free ; the limb of 4 to about 1 2 lobes, valvate in the bud. Petals 

 as many as the calyx-lobes, alternate with them, notched cut or jngg<?d o 

 rarely entire, the margins usually induplicate and embracing the antheis. 

 Stamens as many or twice as many as petals or more, inserted with them 

 the base of the free part or. lobes of the calyx; anthers erect or versatile, /- 

 celled, opening longitudinally! Ovary more or less inferior or rarely qui 

 superior, 2- or more-celled, with 2 or few pendulous ovtiles in each cell, 

 rarely 1-celled by tlie obliteration of tlie partition ; style Undivided, with a^i 

 entire or lobeJ stigma. Fruit inferior or enclosed in the calyx. Seeds so - 

 taiy or few, with or without albumen— Trees or shrubs. Leaves opP^^Uf 

 simple, entire or slightly toothed, coriaceous. Stipules often large, very 

 ciduous. Flowers axillary, solitary, clustered or in cymes. 



A small Order, almost entirely tropical, and chiefly Asiatic or African, with a *^^^^^^,-^^ 

 ricau species. The four Australian genera are all Asiatic, one only extending also to 



de- 





