OF ARTS AND SCIENCES. 197 



AcTiNOLEPis DC, Beuth. In several specimens of A. multiccmlis 

 DC, collected by Professor Brewer, there is a pappus to the disk- 

 flowers, like that of the ray. This confirms the propriety of referring 

 to this genus Nuttall's Ptilomeris, which accords with it in what is well 

 taken as the leading generic character, namely, the enclosure more or 

 less of the ray-achenia in the at length concave or involute scales of 

 the involucre. This, I find, is equally the case with two species, one 

 of which (on account of its setiform anther-tips and the pappus) I had 

 referred to Biirrielia, as then characterized, and the other to Bahia, 

 from which it differs only in the anther-tips, and, as I now perceive, in 

 the inclusion of the ray-achenia. Both, indeed, have an obtusely 

 conical recejjtacle, which would exclude them from Bahia as charac- 

 terized in the Genera Plantarum ; but this is also the case, to an equal 

 degree, in one or two species of the EriophyUum section of Bahia. 



The receptacle varies so widely in Actinolepis as now constituted 

 that it may take in another species with a flat receptacle, namely, Bur- 

 rielia nivea of D. C Eaton ; but this has peculiar achenia and pappus, 

 and may be the type of a distinct genus. 



As revised for the Californian Flora the genus is arranged as 

 below.* 



rima, nunc trisecta : pappus ex aristis sjepius 4 tenuibus, cum paleis 6-8 brevis- 

 simis linearioblongis integerrimis vel bifidis, nunc nuUus. 



7. B. ULiGiJtoSA. Dichceta uliginosa Nutt. Vegetior, foliis saepissime pinnati- 

 fidis, rliachi lata : pappus ex aristis 2-3 paleaceo-subulatis et paleis 3-6 latissimis 

 quadratis laciniato-fiinbriatis, nunc plane nullus. — Var. tekella (Dichceta tenella 

 Nutt.), forma tantum exigua, minus pinnatifida, ligulis involucrique squamis 

 paucioribus. 



* ACTINOLEPIS DC, Benth. 



§ 1. Ptilomeris. Bcerice § DichcetcB afEnis : plautas baud lanatae, saspissime 

 glandulosae ; foliis oppositis pinnatipartitis, segmentis lineari-attenuatis ; capi- 

 tulis longius pedunculatis. Involucrum campanulatum vel hemisplisericum. 

 Receptaculum alte acute conicum. Anthers appendice oblonga superat^. — 

 Ptilomeris Nutt. Hymenozi/s § Oxypappus Torr. & Gray. 



* Glandulosa; ligulis 10-15 elongato-oblongis ; involucri squamis oblongo- 

 lanceolatis ; receptaculo pi. m. pubescente. — Sequentes an species, an stirpes 

 pappo solum diversae 1 



1. A. COEONARIA. Pappo 6 paleis 10 (8-12) oblongo-lanceolatis in aristara 

 productis, paucisve in radio nunc exaristatis. — Ptilomeris coronaria & P. aristata 

 Nutt. Shorlia Californica Nutt. in cat. liortul. Hymenoxys Culifornica Hook. 

 Bot. Mag. ; Torr. & Gray, Fl. 



2. A. ANTHEMOiDES. Magis glandulosa; foliis tenuiter dissectis; capitulis 



