OF ARTS AND SCIENCES. 163 



description, but interesting from the resemblance of the marginal 

 achenia to those of the foregoing plant in the wing, as far as can be 

 judged from the immature state. The disk-achenia, and indeed the 

 whole structure, except the fertile achenia, accord with Bidens. 



64. PoROPHTLLUM GRACiLE, Benth. Bot. Voy. Sulph. p. 29. The 

 specimens accord with Bentham's description, except that the involu- 

 cres are five or six (instead of four) lines in length. Into this my P. 

 Greggii appears to pass, with involucres from six to eight lines in 

 length, and with mostly rostrate achenia. 



65. Dysodia speciosa (sp. nov.) : fruticosa, glabra, valde ramosa ; 

 ramis apice nudis monocephalis ; foliis oppositis trisectis, segraentis 

 petiolulatis rotundatis argute inciso-dentatis vel trifidis lobis incisis den- 

 tatisve, dentibus nonnullis glandula grossa infraterminali instructis ; in- 

 volucro bracteis subulato-setaceis grosse uniglandulosis cincto, squamis 

 linearibus subulato-acuminatis, ligulis involucrum longe sujierantibus ; 

 acheniis glaberrimis. — Frutex vel suffrutex ut videter ultra-bipedalis, 

 ramis patentibus, ramulis floridis herbaceis gracilibus in pedunculum 

 1 - 3-pollicarem sub capitulo leviter incrassatum desinentibus. Foliola 

 4-6 lin. longa, membranacea, nunc rigidula, glabra vel tenuissime pu- 

 berula, aut rotundata grosse inciso-dentata, aut 3 - 5-fida lobis argute 

 incisis. Petioli et petioluli interdum lobulis dentibusve parvis 1-2 in- 

 structs Capitulum fere pollicare. Bracteae tenues, aristat^e, involu- 

 crum dimidio breviores. Involucri squamge 17-20, rigidge, sub acu- 

 mine setaceo grosse uniglandulosae, inferne glandulis 2-4 juxtamargi- 

 nalibus elongatis sjepe notatte. Ligulre 14-16, conspicuse, aurantiaceae, 

 oblongae, semipollicares. Receptaculum breviter hirsutum. Pappus 

 albus, 10-paleolatus, paleolis lato-linearibus 7-9-setosis. — A striking 

 species, helping to connect Clomenocoma with Dysodia. But the invo. 

 lucre is as uniserial as in other DysodicB. So it also is in D. montana 

 (^Clomenocoma montana, Benth. PI. Hartw. p. 86, 351), which Bentham 

 is disposed to refer to D. grandiflora of De Candolle. It is, I think, 

 distinct from, though strictly congeneric with, that species. 



66. Gnaphalium leucocephalum, Gray, PI. Wright, 2, p. 99. 



67. Malacothrix parviflora, Benth. PI. Hartw. p. 321 ? 



68. Macreightia intricata (sp. nov.) : tenuiter sericeo-puberula, 

 mox glabra ; foliis coriaceis cuneato-oblongis retusis leviter tripUnerviis 

 parvis (6-12 lin. longis). — Intricato-ramosus, ramulis rigidis. Pe- 

 dunculi fructiferi 3 lin. longi, solitarii. Bacca globosa, magnitudine 

 pruni, calyce crasso-coriaceo trilobo stipata, 6-sperma. — The flowers 



