202 CHARJâ AUSTRALES ET ANTAltCTICiE. 



and stipules, and larger seeds. The nut of the seed is about .50 m. 

 long, and .40 m. thick. The présence of a weak incrustation can be 

 seen when exposed to hydrochloric acid arising out of carbonic acid. 



17. Ch. Preissii; dioica, rigidiuscula, diaphana; caule stricto corticato, 

 aculeis sparsis elongatis armato; verticillorum foliis 9-10, omnino 

 ecorticatis, 5-articulatis, articulo ultirno attenuato foliola geniculum 

 ultimum coronantia non superante ; foliolis in omnibus foliorum 

 geniculis verticillatis, quam semina duplo longioribus ; stipulis duplici 

 foliorum numéro, elongatis, coronam simplicem verticillo appressam 

 formantibus ; seminibus solitariis, fasciis circiter 11. 



Ch. Preissii, A. Br. in Linnaa, 17, p. 118. Plant. Preiss. 2. p. 147. 

 /3. microptïla, aculeis, stipulis et foliolis brevioribus, ventricosis. 



Avon Rive?\ Preiss ; Swan River, Drummond No. 2, in herb. Hook. 

 Var. /3. Swan River, Drummond, No. 3, in herb. Hook. 



In tliis species by application of hydrochloric acid no carbonic acid 

 appeared. The nut of the seed is without the calcareous covering 

 peculiar to the greatest part of the true Cliarœ. Length of the nut 

 .48 m., thickness .32. 



18. Ch. Hookerii ; dioica, rigidiuscula, diaphaua ; caule stricto corti- 

 cato, aculeis subverticillatis brevibus ventricosis cuspidatis armato ; 

 verticillis numerosis concatenatis e foliis 10-11, 4-articulatis, articulo 

 ultimo attenuato foliola geniculi ultimi superante ; foliolis in omnibus 

 foliorum geniculis verticillatis, e lata basi cuspidatis, erectis, quam 

 antheridia (et semina ?) multo brevioribus ; stipidis duplici foliorum 

 numéro, abbreviatis, ventricosis, coronulam simplicem gibboso-ven- 

 tricosis, coronulam simplicem verticillo appressam formantibus ; an- 

 theridiis solitariis; seminibus. . 



Van Diemen's Land, Gunn, 1832, No. 1001, in herb. Hook. 



This species is distinguished by its peculiar habit. The stems are 

 almost simple, the numerous whorls of short and somewhat incurved 

 leaves form a long chain. From the preceding species it chiefly difters 

 in the short and tumid prickles, foliola, and stipulée, which are finely 

 acuminated. The female plant is wanting in Sir William Hooker's 

 collection. 



* * gymnopodes, foliorum articulo infimo ecorticato, sequentium 

 nonnullis corticatis. 



To this division belongs Ch. Hydropitys, llcichenh., inhabitiug East India and 

 South America. 



