V. PLANTiE WRIGHTIAN^. 99 



The form with rather large heads. The ripe achenia are turgid, with two sharp nar- 

 row margins, transversely rugose, the crustaceous walls very thick. If G. micro- 

 cephala, DC. has smooth achenia, it is probably a distinct species. Otherwise it is to 

 No, 297 what the small-flowered G. squarrosa is to No. 296. — G. inuloides /3. Torr. 

 8f Gray, belongs to G. integrifolia. G. stricta, DC. ! Prodr. 7. p. 278, is apparently 

 a slender and small form of G. integrifolia, /3. virgata, Toir. Sf Gray. G. discoidea, 

 Hook. Sf Am. (non Nutt.) is, I believe, G. anomala, DC, so that Nuttall'sname may 

 be retained for the Oregon species. 



298. Chrtsopsis canescens, Torr. Sf Gray, Fl. 2. 2^. 256. Valley of the San 

 Pedro and of the Limpia ; July. 



299. C. FOLiosA, Nutt. in Trans. Amer. Phil. Soc. ; Torr. ^ Gray, Fl. 2. p. 256 ; 

 var. minus canescens ; foliis parvulis ssepius setoso-ciliatis. — Mountains east of 

 El Paso ; Sept. 



LAPHAMIA, Nov. Gen. 



Capitulum pluri - multiflorum, nunc homogamum discoideum, nunc radiatum ho- 

 mochromum ; ligulis paucis, ovalibus oblongisve, 2 - 3-dentatis, discum baud super- 

 antibus. Involucrum uni - biseriale ; squamis sequalibus, oblongis vel lanceolatis, 

 membranaceis, uninerviis, carinatis, apice ciliatis. Receptaculum planum, scrobi- 

 culatum, nudum. Flores disci hermaphroditi. Corollse (extus viscoso-glandulosse) 

 tubulosse, fauce pi. m. ampliata, dentibus 5 ovatis patentibus. Antherse basi sagit- 

 tatsB vel bidentatae. Styli rami fl. disci angusti sed complanati, in appendiceal subu- 

 latam hispidam producti. Achenia conformia, lineari-oblonga, corapressa, praeser- 

 tim ad nervos marginales hirtella. Pappus aut plane nullus, aut unisetosus, aut 

 (in specie forte aliena) plurisetosus, setis hirtellis. — Herbse vel potius suftVutices 

 rupicolse, humiles vel nanse, puberulse ; caudice crasso lignoso caules plures foliosos 

 proferente ; foliis alternis et oppositis, ovatis, cordatis, oblongisve, ssepius dentatis 

 petiolatis, atomis resinosis conspersis vel minute punctatis ; capitulis solitariis vel 

 corymbosis terminalibus ; floribus flavis. 



I dedicate this genus to I. A. Lapham, Esq., of Milwaukee, Wisconsin, author 

 of a catalogue of the plants of that State, and a zealous explorer of its botany. 

 In order to their proper arrangement, I give the five known species in the text, al- 

 though the two with unisetose pappus have not been received from Mr. Wright. 

 The position of the genus is uncertain, " neither the form of the style nor the habit 

 being very decidedly that of any of the great tribes of Compositee," as Mr. Bentham 

 remarks of his genus Perityle ; to which genus this is manifestly allied, through 

 the unisetose species. It has a similar habit, and exactly the same kind of style, 

 involucre, &c. ; but the pappus wants the crown of squamellse, and in two species 

 there is no pappus at all. I think that both genera belong rather to the Asteroidese, 

 notwithstanding the tendency to have opposite leaves. — The first section might be 

 taken for a separate genus. 

 § 1..^ Pappothrix. Involucrum 5 - 8-phyllum, 12-15-florum, cylindraceum, disco 



aequale. Ligula; nullse. Corollse disci fauce infundibulari-cylindracea elongata e 



tubo brevi. Pappus e setis circiter 20 conformibus, sed intequilongis, capillaribus, 



