OF ARTS AND SCIENCES : MAY 13, 1873. 635 



Like Aster, too, it has a few annual or biennial species, so that Xan- 

 thisma is not supported by this subsidiary character. Bentham makes 

 Aplopappus include all the groups which I have referred to it, except- 

 ing Nuttall's Ericameria and Macronema. I have endeavored to 

 adopt his view while now revising the North American species, but I 

 find it impossible to do so. Neither the style-appendages (which are 

 " long and narrow " in many an admitted North American species), nor 

 the form and nature of the involucre and number of flowers it contains, 

 nor the form of the achenia, nor the texture of the pappus, nor the 

 habit, taken singly or in any practicable combination, enable me to 

 draw any clear line of separation. Nor is the line which must be 

 drawn for the demarcation of Bigelovia (Ckrysotkamnus) any less arbi- 

 trary when we have two bordering genera to deal with instead of one. 

 One of Nuttall's species of Macronema closely connects Ericameria 

 with other sections of Aplopappus, and the other with Chrysothamnus ; 

 while, as to Chrysopsis, a pretty well marked genus is rendered vague 

 by the admission of species of a different habit and no external pappus. 



It should be noted that Bentham's section Haplodiscus is not De 

 Candolle's Aplopappus sect. Aplodiscus, the typical species of which 

 is referred to Bigelovia ; while the other proves to be a Baccharis. 



Bentham's doubt whether Aplopappus marginatus Griseb. Cat. PI. 

 Cub. belongs to the genus, or has yellow rays, is well founded. Mr. 

 Wright's tickets preserved here, as well as the one cited by Grisebach, 

 state that the rays are white ; and the plant is doubtless an Aster of 

 the Oxytripolium section, allied to A. Chapmanii and A. Jlexuosus 

 of Nuttall, i. e. A. tenuifolius Linn. 



Recent collections have furnished the following additions to the 

 Ericameria sections : — 



Aplopappus (Ericameria) cuneatus. Fruticosus, ut videtur 

 depressus, caespitoso-ramosissimus. glaber, mox glutinosus ; ramis flori- 

 dis ad apicem usque foliosis ; foliis cuneatis vel spathulato-dilatatis 

 (apice lato truncato vel emarginato) integerrimis crassis resinoso- 

 punctatis eveniis, costa vix prominula; capitulis subcorymbosis 20 -24- 

 floris ; involucri turbinati squamis pluriseriatis lanceolatis carinato- 

 uninerviis chartaceo-coriaceis, interioribus marginibus apiceque leviter 

 scariosis disco brevioribus, exterioribus sensim brevioribus ; ligulis circa 

 3 discum baud superantibus ; appendicibus styli angustis parti stigma- 

 titera? requilongis ; acheniis lineari-oblongis compressis parce hirsutis ; 

 p;ippo parum rigido sordido. — California, in " Bear Valley, alt. 4,500 



