654 PROCEEDINGS OF THE AMERICAN ACADEMY 



To the account of these new Compositce of Western North America 

 I append the characters of a striking new genus belonging to the Sand- 

 wich Islands, recently discovered by Mr. Horace Mann. 



HESPEROMANNIA. Nov. Gen. Mutisiacearum. 



Capitulum homogamum, multi- et a^qualiflorum, discoideum, flori- 

 bus hermaphroditis. Involucrum campanulato-turbinatum, multiseriale ; 

 squamis chartaceo-rigidis obsolete nervatis, mucronato-acutis, interiori- 

 bus lineari-lanceolatis, exterioribus sensim brevioribus. Receptaculum 

 planum nudum. Corollte subcoriaceie, angustte, subregularis (leviter 

 bilabiata3,§, extus intusque glabrae, tubo 5-nervi), laciniis longis lineari- 

 bus erectis. Filamenta irao tubo corolla? inserta, e fauce exserta : an- 

 therge lineares, brevissime caudatfE, caudis truncatis ultra articuluni 

 baud productis. Stylus filiformis, ramis brevissimis angustis acuti- 

 usculis. Achenium oblongo-lineare, angulatum, erostre, glabrura. 

 Pappus multiserialis, setis rigidulis scabris. — Arbuscula inermis, 

 glaber; foliis obovato-oblongis subserratis penninerviis breviter petio- 

 latis ad apices ramorum brevium confertis ; capitulis terminalibus sub- 

 urabellatid brevi-pedunculatis ea Chuquiragce insignis temulantibus ; 

 floribus flavis. 



Hesperomannia arborescens. — On the highest part of Lanai, 

 one of the Sandwich or Hawaiian Islands ; coll. Hoi'ace Mann and W. 

 T. Brigham. 



This is specially interesting as being the only known Lahiatijlora 

 from any of the proper Pacific Islands. These Compositce, so char- 

 acteristic of South America, appear to be wanting even in Juan Fernan- 

 dez. As the present plant does not fall into any published genus, it would 

 appropriately bear the name of its discoverer, Mr. Horace Mann, the 

 latest and one of the most ardent explorers of the botany of the 

 Sandwich Islands, who has gleaned not a few novelties in a field 

 which has been harvested by numerous botanists, from Nelson and 

 Menzies, in the times of Cook and Vancouver, down to Remy in 1851 - 

 1853. The name of Mannia, however, having been already bestowed 

 upon a genus of Simarubece, in commemoration of the arduous botani- 

 cal services of Mr. Gustavus Mann in Tropical Africa, I venture, in 

 the generic appellation here proposed in compliment to our Western 

 young botanist of the same name, to compound the word by a distin- 

 guishing prefix. 



