194 THE VOYAGE OF H.M.S. CHALLENGER. 



CEASSULACE^E. 

 TillaBa moschata, DC. 



Tillcea moschata, DC, Prodr., iii. p. 3S2 ; Hook, f., Handb. FL N. Zeal., p. 61 ; Phil. Trans Koy. 



Soc. Lond., clxviiL p. 20 ; Hook., Ic. PL, t. 535. 

 Bulliarda moschata, D'Urv. in Mem. Soc. Linn. Par., iv. p. 618; Hook, f., Fl. Antarct., p 15 et 



p. 278. 

 Crassula moschata, Forst., Comm. Gcett., ix. p. 26 (reprint, p. 16). 

 Bulliarda magellanica, DC, Bull. Philom., n. 49. 



Marion Island. Moseley. 



Diffused all round the south temperate zone, including the Crozets and Kerguelen 

 Island. 



HALORAGE.E. 



Callitriche verna, Linn., subsp. obtusangula. 



Callitriche verna, Linn., subsp. obtusangula, Hook. f. in Phil. Trans. Roy. Soc. Lond., clxviii. p. 20. 

 Callitriche verna, Linn., Sp. PI., ed. 2, p. 6 ; Hook, f., Fl. Antarct., p. 272 ; Handb. Fl. N. Zeal., p. 68. 

 Callitriche obtusangula, Le Gall. ; Hegelm., Monogr. Callit., p. 54 (species) ; Hook. f. in Phil. Trans. 



Roy. Soc. Lond., clxviii. p. 20. 

 Callitriche antarctica, Engelm. ; Kidder in Bull. U.S. Nat. Mus., iii. p. 23, ex Hook, f., 1. c. ; Oliver 



in Journ. Linn. Soc. Lond. xiv. p. 380. 



Marion Island. Moseley. 



This form occurs in many of the southern islets, as the Crozets, Kerguelen, Heard, and 

 Campbell Islands, as well as in Polynesia. We have only seen European localities recorded 

 for it in the northern hemisphere. Callitriche verna in a broad sense is generally diffused 

 in temperate regions. 



UMBELLIFER^E. 

 Azorella selago, Hook. f. 



Azorella selago, Hook, f., Fl. Antarct., p. 284, t. 99 ; et in Phil. Trans. Roy. Soc. Lond., clxviii. p. 20. 



Marion Island. Moseley. 



This species occurs in Fuegia, the Falklands, the Crozets, Kerguelen, Heard, and 

 Macquarie Islands — a noteworthy area of distribution, especially in relation to its 

 existence in the last-named island, and its absence from the Tristan da Cunha group. 



The genus Azorella, even in the extended sense of Bentham and Hooker's Genera 

 Plantarum, and in Bentham's Flora Australiensis, is confined to the south temperate zone 

 and Andine America ; but the section to which Azorella selago belongs, which is char- 

 acterised by the dense cushion-like habit of growth of its species, is peculiar to America 

 and the islands and islets as far eastward as Macquarie Island. The New Zealand, and 

 especially the Australian species, are very different in habit, yet their carpological 

 characters are much the same. 



