Neue Litteratur. 39T 



were mainly derived from the absence of a pappus, and from the 

 remarkable foliage and inflorescence of the only species then rendered 

 known — namely Humea elegans (Calomeris amaranthoide», Ventenat), a 

 native of south-eastern Australia. When, in 1839, Professor Lindley 

 described as new the genus Pithocarpa, from south-western Australia, 

 also containing a solitary species only, it could not be expected, that 

 two plants so differently looking and from places so widely apart should 

 be considered congeneric. When, in 1852, a third species turned up, 

 this time in South-Australia, and was then defined by me, it was also 

 thought, on account of its peculiar habit and headlets, that it was the 

 type of a new genus (Haeckeria), though the alliance to Humea was 

 already recognized. But when soon, subsequently a fourth and a fifth 

 were found in Victoria, I saw the necessity of uniting Haeckeria with 

 Humea, but maintained the genus Acomis, with two species discovered 

 not much later in New South Wales and Queensland, the habit being 

 again so very different from that of any of the other Humeas. Quito 

 recently however a sixth species, with much of the outer appearance of 

 an Acomis, and much also resembling Helipterum Jesseni, was brought 

 from south-western Australia, so that it now seems best, to place all eight 

 under one genus. We obtain thus four sections for Humea, though the 

 genus still continues so small; but these sectional divisions correspond 

 precisely to groups in the genera Helichrysuro or Helipterum or Cassinia. 

 In the last-mentioned genus, C. sputabilis Stands similarly as much alone 

 as Humea elegans among its congeners. Pithocarpa resembles, as regards 

 its flower-headlets, much Helichrysum obtusifolium, though the lower 

 involucral bracts are narrowed somewhat like those of H. collinum and 

 H. oxylepis, remiuding also of Leptorrhynchus. Moreover, withiti Ine 

 genus Helichrysum occur, as in Haeckeria, also species with few-flowered 

 headlets, for instance : — H. baccharoides, H. ferrugineum, H. cuneifolium, 

 H. rosmarinifolium, H. selaginoides. Perhaps future researches, particularly 

 in Central Australia, will add yet to the genus Humea; but the eight 

 species, hitherto known, might be arranged in the following sequence: — 

 Section Calomeris — H. elegans; section Haeckeria — H. ozothamnoides, 

 H. cassiniacea, H. squamata; section Pithocarpa — H. carymbulosa ; section 

 Acomis — H. rutidosis, H. macra, H. gracillima. Let me yet add, that 

 Humea, thus extended, differs from Helichrysum, Helipterum and Rutidosis 

 only in th-- complete absence of the pappus ; the form of that organ 

 being also the only mark for distinguishing these three genera from 

 each other. 



December, 1892. 

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Rowlee, TV. W., A new Station in New York State for Saxifraga aizoides L. 

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