342 DR. T. THOMSON O^ TWO NEW GENEEA OF COMPOSITuE. 



different reactions (blue, violet, vinous red, yellow, or colourless) 

 whicli are observed in different lichens. 



y 



On two new Genera of Composites /Mutisiacead^ from India. 



By Thomas Thomson, M.D.,r.L.S, 



[Read June 7, 1866.] 



[Plates III. k IV.] 



1, Nanothamnus, n. g. 



Capitulum 5-6-florum, bomogamum. Involucrum pluriseriale, 

 imbricatum, squamis extus longe pilosis acutis, interioribus 

 sensim longioribus, intimis basi membranaceis ; receptaculum 

 parce fimbrilliferum. Corolla bilabiata, labio exteriore lato 

 4-lobo, interiore integro longe lineari, tubo extus parce patentim 



' glanduloso piloso; antberse brevissime caudatse, caudis acutis. 

 Pollen Iseve, globosum. Stylus basi bulbosus, ramis filiformibus 

 puberulis. Achenia moUiter pubescentia, valide 10-costata, 

 costis apice in annulum cyathiformem acbenium coronans coa- 

 lita. Pappus nullus. Herba facie Blumece, floribus (e sicco) 

 flavescentibus. 



Nanothamnus sericeus, n. sp. 



Habitat in collibus aridis provincise Concan Indiae occidentalis, 

 Herba perenms,pluricaulis,cauUbus adscendentibus 3-6-pollicaribus. Folia 

 ovato-oblonga vel ovato-lanceolata, argute serrata, radicalia circa coUum 

 fasciculata, caulina altema, plus vel minus sericea, interdum glabres- 

 centia, Capitula in fasciculos terminales aggregata, vel in axillis foli- 

 orum sessilia, vel ramulos breves termiuantia. 



This very remarkable little plant was sent to Kew some years 

 ago by Mr. Dalzell in a letter ; and on examination of the Her- 

 barium, there was found a small specimen in a too advanced state 

 for description, which was sentbylMr. Law many years ago. In 

 some respects it^approaches I)icoma\ but its characters are very 

 well marked. 



2. Catamiiis, n. g. 



Capitulum 5-florum, homogamum. Keceptaculum nudum, an- 

 gustum. Involucrum pluriseriale, imbricatum, squamis exten- 

 oribus brevibus ovatis acutis, interioribus sensim longioribus, 

 intimis lanceolato-linearibus acuminatis. Corolla infra me- 

 dium late tubulosa, aunra medium li^ulata. lamina apice angus- 



