MVRTALES.J 



HALORAGACE^. 



723 



the solitary carpel is only a portion of the do-raded structure which is proper to all the 

 other organs. In Hippuris and Myriophyllum the stem consists of a curious arrange- 

 ment of necklace-shaped cellular tissue, which 

 radiates from the centre, leaving large air-cavities 

 between its rows. In the centre is a cylinder of 

 very fine woody tubes, which inclose a confused 

 mass of cellular tissue and spiral vessels. It was 

 probably this which led Prof. Link to regard 

 Ilippurids as Endogens. 



Damp places, ditches, and slow streams, in 

 Europe, North America, Southern Africa, Japan, 

 China, New Holland, and the South Sea Islands, 

 are the resort of this Order. 



They are in general of no importance. Halo- 

 ragis citriodora, the Piri-Jiri of the New Zealand- 

 ers, derives its specific name from its fragi-ant 

 odour. Trapa, a plant with horned fruit, and gi-eat 

 amygdaloid seeds, one of whose cotyledons is 

 much smaller than the others, has eatable kernels. 

 Trapa natans is called Marron d'Eau, or Water 

 Chestnut by the French ; and is said to have fm'- 

 nished a large part of their food to the ancient 

 Thracians, in the same manner as T. bispinosa, 

 or the Singhara Nut does at the present day to 

 the inhabitants of Cashmere, and T. bicornis to 



ccccLxxxm. 



CCCCLXXXIV 



the Chinese. It is mentioned by Dr. Royle that the former yielded as much as 1 2,000/. 

 a year of revenue to the government of Runjeet Singh, the tax beuig levied upon from 

 96,000 to 128,000 ass-loads from the great lake of Ooller. 



GENERA. 



I. Halorage^. 



Hippuris, Linn. 



Limnopeuce, Vaill. 



Pinastella, Dillen. 

 Myriophyllum, Vaill. 



Sphondylophyllwn , 



Torrey et Gray. 



Pentapteris, Hall. 

 Sphondylastrwn , Torr. 

 Ptilophyllum, Nutt. 

 Purshia, Raf. 

 Hylas, Bigel. 

 Serpicula, Linn. 

 Laurembergia, Berg. 



Proserpinaca, Li/m. 



Trixis, Mitch. 

 Meionectes, /{. Br. 

 Haloragis, Forst. 



Cercodia, Murr. 



Cercodea, Lam. 



Gonocarpiis, Thunb. 



Gonatocarpus, Willd. 



Goniocarpus, Kon. 

 Loudonia, Lindl. 



Glischrocaryvn, Endl. 



II. iRAPYije., Endl. 



Trapa, L. 

 Tribitloidcs, Toum. 



Numbers. Gen. 8. Sp. 70. 



Comhretacea. 

 Position. — Onagracese. — Haloragace^.- 



Fig. CCCCLXXXIII. — Hippuris vulgaris. 1. a complete flower; 

 the position of the ovale ; 3. a section of the ripe fruit and seed. 

 Fig. CCCCLXXXIV.— Fruit of Trapa bicornis. 



2. a section of the pistil, showing 



3a2 



