Plants of the Rocky Mountains — Supplement IV. 339 



Euchroma albida, Niitt. in herb. Acad. Pbilad., is Orthocarpus aftenu- 

 aius, Gray in Bot. Wliippl. Exped. Pacif. K. R. Rt-p. 4, p. 121. This is 

 the "0. No. 1," of Dr. Lyall's collection on the Oregon Boundary, from 

 JLopez Island, distributed at Kew Gardens, 



Euchroma pallescens, Nutt, in herb. Acad. Philad., from t1)e Reeky 

 Mountains, being a near relative of the preceding and of Orfhocarpus 

 densijforus, and I believe not a described species, would take the name of 

 O.pallescens. The lobes of the lower lip of the corolla are so conspicu- 

 ous that it can hardly be O. hispldus, Benth., a species unknown to me. 

 The segments of the deeply two-cleft calyx are merely bifid at their apex. 

 iNear to this, if not the same, but more hairy, with deeper-cleft calyx- 

 setjinents, and yellowish corolla almost an inch long, are specimens of 

 wyer's Rocky Mountain collection, distributed as No. 291, therefore 

 Prol.ably those mentioned in Hook. Kew Jour. Bot. 5, p. 259. Here 



pletely developed specimens might very readily be taken for those of a 



Supplement IV. — Review of the genus Mertensia ; by A. Grat. 



MERTENSIA, Roth. 

 The species of Mertensia which I have been able to examine, although 

 'i^t a httle perplexing, may perhaps be best discriminated as follows: — 

 , § 1. Filamenta gracilia antheris multo longiora: corollae tubo calyce 

 aite 5 fido pluries longiore, limbo levissime lobalo, plicis faucialibus nul- 

 li^- Tota glaberriraa." 



1- M. ViRcrNicA, DC. — The disk is annular, but on each side developed 

 into a large lobe or glandular appendage. That of M. Fendleri and of 

 some specimens of M. pankulata approaches it. Corolla villous inside 

 just above the obscurely lO-glandular base of the tube. 



§ 2. Filamenta antheris plus minus angustiora et longiora : corollas 

 'iinbo lobato. 



2- M. MARiTiMA, Don. Coroll* tubo limbo breviore calycem sub-5- 

 paiiitum subseqaunte, plicis conspicuis. 



3- M. Pallassii, Don. M. Sibirica, DC, &c. Pulmonaria Sibirica, 

 ^'<il-, non Linn. Zithospermum Fallassi, Ledeb. Corollse tubo limbo 

 ^M-plo calyce 3-plo longiore, plicis tenuibus. Siberia. 



§ ^- Filamenta magis dilatata, antheris ^quilata seu laliora et plus 

 ^■nus breviora: corolTte limbo 5-fido. 

 Cali/x kaud ultra medium b-fidus. 



^- M. Fendleri (sp. nov.) : foliis subtus cauleque Isvibus supra cum 

 PeJicellis appresse hispidulis, caulinis oblongo-lanceolatis ; racemis pauci- 



'^''giore intus supra basiin anni 

 ^" Santa Fe Creek, Fendler No. < 

 ^- JocB. Sci. -Second Sekies, Vol. XXXIV, No. 102.- 



