318 PLANTS OF CENTRAL AUSTRALIA 



volucmin distinct and entire, differs from it in having its 

 calyx 5-fid with sharp sinuses, in the absence of glands, 

 in the reduced number of stamina, and in its dispermous 

 ovaria. 



3. TiUBULUS {Hystrix) lanatus, foliis 8-10-jugis, fruc- 

 tibus undique tectis spinis subulatis longitudine insequa- 

 libus : majoribus sparsis longitudiaem cocci superan- 

 tibus. 



Log. " In coUinis arenosis. Lat. 26°." D. Sturt. 



Desc. Herba difi'usa, sericea, incana. Folium majus 

 cuiusque paris 8-10-jugum, foliolis ovatis. Flores magni. 

 Calyx sestivatione leviter imbricata. Petala calyce duplo 

 longiora. Stamina decern, antheris linearibus. 



Obs. I. A species nearly related to T. Hystrix, found 

 on the west coast of Austraha, or on some of its islands, 

 in the voyage of the Beagle, may be distinguished by the 

 following character. Tribulus {occidentalis) sericeo-lanatus, 

 foliis suboctojugis, coccis undique dense armatis : spinis 

 omnibus conico-subulatis longitudine invicem sequalibus. 

 These two species differ from all others in the uniform shape 

 of the spines, which equally cover the whole external surface 

 of the fruit. 



Obs. II. The American species of the Linnean genus 

 Tribulus are distinguishable from the rest of the published 

 species, by having ten monospermous cocci, by their persis- 

 tent calyx, and the absence of glands subtending the 5 

 filaments opposite to the sepals. 



This tribe was originally separated as a genus by Scopoli, 

 under the name of Kallstrcemia, which has been recently 

 adopted by Endlicher. 



Another tribe exists in the intratropical part of the Aus- 

 tralian continent, to which, nearly 40 years ago, in the Bank- 

 70] sian Herbarium, I gave the generic name of Tribulopis 

 and which may readily be disthiguished by the following 

 characters. 



