Composite.] CALIFORNIA— SUPPLEMENT. 357 



tubulam). Fisch. et Mey. Ind. 3. Sem. Petrop. 1837. n. 1449. Linncea, XII. Litter, p. 102. 

 Schauer, Del. Sem. H. Vrat. 1837. p. 3. Linncea, XII. Lit/, p. 89. 



This genus differs from Oxyura by the achenia of the disk having a pappus and being pubescent; from 

 Callichroa, by the form of the achenia, the entirely paleaceous receptacle, and the pappus being unequal in 

 length and rather more paleaceous ; from Hartmannia, by the pales of the pappus not being membranous, 

 and the form of the achenia of the ray ; and from Madaraglossa, by the palea; of the pappus not pluinoselv 

 ciliated or villous at the base. It is unnecessary to propose a new generic character, as that given by Fischer 

 and Meyer, combined with Schauer's observations, 1. c, under Oxyura and Callichroa, is sufficient. 



1. Callichroa platyglossa. Fisch. et Mey. Ind. 2. Sem. Petrop. p. 31. et Ind. 3. //. 

 347. Schauer Del. Sem. H. Vrat. 1837. p. 3. Don in Sweet, Br. Fl. Gard. p.\.t.3TS. Dt 

 Cand. Prod. 7. p. 294. 



Very similar in habit to the two preceding ; our wild specimens were collected by Mr Douglas, although 

 unnoticed as such by De Candolle. 



1. Hartmannia fasciculata. De Cand. Prod. 5. p. 693. 



The paleae to the florets of the disk are about eight in number (not five as in De Candolle's generic cha- 

 racter), equal in length, but unequal in breadth, and are irregularly inciso-serrated towards the apex ; the 

 terminal tooth or segment being very acute, so that the paleee can scarcely be called obtuse as they are de- 

 scribed in De Candolle's Frodromus. 



2. H. corymbosa. De Cand. Prod. 5. p. 694. 



With this we are unacquainted. 



3. H. ciliata. De Cand. Prod. 5. p. 694. 



This also we have not seen ; the want of a pappus seems to remove it from the genus j perhaps it ought 

 to be united to Oxyura. 



4. H.? pungens ; herbacea basi sublignosa confertim foliosa, caule parce ramoso [)ilis 

 albidis setoso, foliis inferioribus pinnatifidis, lobis oblongis vel oblongo-lanceolatis spinoso- 

 mucronatis, superioribus ac fasciculorum axillarium linearibus integris rigidis spinescenti- 

 bus margine recurvis papilloso-pilosis, capitulis subsolitariis bracteatis, involucri squamis 

 spinescentibus glandulosis ligulas radii bifidas subasquantibus, acheniis epapposis radii 

 gibbis areola terminali valde obliqua, receptaculo toto paleaceo, paleis lanceolato-subu- 

 latis spinescentibus. Hook. Ic. PL v. 4. t. 334. 



This is a very remarkable plant, more like a species of Navarretia among the Polemoniacea: than one ol 

 the present Order. We can find no trace of it in De Candolle's Prodromus. 



1, Layia gaillardioides ; decumbens setis patentibus rigidulis undique hispida, tolns 

 oblongo-lanceolatis inferioribus inciso-serratis superioribus integris, ramulis flonbus 

 monocephalis subelongatis, ligulis 12-15 obovatis apice trindis discum duplo superanti- 

 bus, pappo disci fulvo.— Layia galardioides. De Cand. Prod. 7. p. 294.— Tridax ? Hook. 

 et Arn. supra, p. 148. 



The genus Layia, which we had suggested for this plant, is the same as Madaraglossa, the only difference 

 being that in the latter the palese of the receptacle are all placed between the ray and the disk, not spread 

 over it. The above species we have not received from Douglas. Layia we retain to a leguminose plant 

 described supra, p. 182. 



