210 PROCEEDINGS OF THE AMERICAN ACADEMY 



Aster imhricatus, "Walp. Rep. ii. 574. This is the name, by 

 transference, of the Chilian species named by Xuttall Tripolium im- 

 hricatum. And it may here be noted that it is the original Tripolium 

 conspicuum. Lindl. in DC. Prodr. v. 254, founded on specimens of 

 Bridges and Bertero ; a jalant of rather rigid and strict habit, perhaps 

 perennial, with comparatively large solitary heads, and a "turbinate" 

 involucre of firm i^luriserially imbricated bracts, the outermost ovate 

 and ovate-lanceolate, the inner mostly acute. It is quite different 

 from the common and wide-spread annual sj)ecies which has been 

 taken for it. 



Erigeron dryopiitllus. Euerigeron, subcinereo-pubescens ; 

 radice perenni ; caule pedali parce ramoso ; ramis npice nudis mono- 

 cephalis ; foliis membranaceis obovatis lyrato-pinnatifidis sinuatisve 

 in petiolura alatum attenuatis, ramealibus lanceolatis snbintegris ; 

 involucri bracteis subulatis ; ligulis 80-90 longe exsertis lin. 3 longis 

 albis purpureo tinctis ; acheniis parce hispidulis ad margines tantum 

 nervatis ; pappo fere simplici, setulis exterioribus paucis exiguis. — 

 Northern Mexico, in the mountains at Guajuco, N. Leon, southeast of 

 Monterey, Palmer, no. 495. 



Erigeron Pringlei. Ctespitosus e caudice crasso multicipiti, 

 pygmfEus, fere glaber et loevis ; caulibus floridis simplicibus erectis vel 

 patentibus gracilibus inferne foliatis monocephalis ; foliis radicalibus 

 pinnatim 3-5-fidis in petiolum longe attenuatis, lobis brevibus oblongis 

 acutis, caulinis angusto-linearibus ; involucro glabro ; ligulis 25-35- 

 violaceis. — Crevices of rocks on the Santa Rita Mountains at the 

 elevation of 9000 feet, S. Arizona. Pringle. 



Erigeron Muirii. AfRnis E. grandijtoro, Hook., differt insig- 

 niter lana gnaphalioidea mollissima longa herba tota vastiente ; 

 caulibus spithamieis monocephalis ; foliis plerisque spathulatis ; invo- 

 lucri bracteis sursum attenuatis ; ligulis albis ; pappo externo multi- 

 squamellato conspicuo. — Cape Thompson, Ahx&ksi, John Muir, 1881. 

 The most interesting and apparently the only new species of an ex- 

 tensive and truly valuable collection made by Mr. Muir in a recent 

 searching-cruise which he accompanied, and which extended to 

 Wrangel Island. The plant seems to have been abundant, for it 

 occurs in the collection under three numbers. The head, style, rather 

 scanty main pappus, &c., are very much as in E. grandijlorus, espe- 

 cially of the var. lanatiis ; but of that the pubescence is villous, except 

 at the head, towards the base of the plant varying to hirsute : in this 

 the whole plant is densely clothed with long and soft cottony wool, 



