46 [339] Plants of the Rocky Mountains—Supplement IV. 
Euchroma albida, Nutt. in herb. Acad. Philad., is Orthocarpus attenu- 
atus, Gray in Bot. Whippl. Exped. Pacif. R. R. Re ep. 4, p.121. This is 
the “O. No. 1,” of Dr. Lyall’s nue ate on the Oregon Boundary, from 
Lopez mente distributed at Kew Gardens. 
Huchroma pallescens, Nutt. in tah. “hae Philad., from the Rock 
eran Satie a near relative of the preceding and of Orthocarpus 
paid and [ 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 oe it can hardly be O. hispidus, Benth., a species unknown to me. 
The segments of the deeply two-cleft calyx are merely bifid at their apex. 
Near to this, if not the same, but more hairy, with deeper-cleft, calyx- 
segments, and yellowish corolla almost an inch long, are specime 
probably those mentioned in Hook. Kew Jour. Bot. 5, p. 259. Here 
also the lobes of the lower Yip are quite conspicuous, and the incom- 
oo developed specimens might very readily be taken for those of a 
Surriemenr IV,—Review of the genus Mertensia; by A. Gray. 
MERTENSIA, Roth. 
The species of Mertensia which I have been able to examine, although 
not a little perplexing, may perhaps be best discriminated as follows 
§ 1. Filamenta gracilia antheris multo longiora: corolle tubo calyce 
alte 5- fido pluries longiore, limbo levissime lobato, plicis faucialibus nul- 
ota glaberrima. 
1. M. Virersica, DC.—The disk is annular, but on each side developed 
2 a large lobe or goa appendage. That of M. Fendleri and of 
€ specimens of M. paniculata i sagt = Corolla — inside 
iu above the REE 9 10-glandulay base of the tube, 
§ 2. ei antheris plus minus angustiora et longiora: corolle 
limbo lobato. 
MARITIMA, Don. Corolla eg limbo beac calycem sub-5- 
partitum sidieepucital plicis conspicu 
3. M. Paxtassir, Don. M. Sibi ote s, DC, &e. Pulmonaria Sibirica 
Pall, non Linn, Lith hospermum i, Ledeb. ae tubo limbo 
14-2-plo calyce 3-plo longiore, licks Scie Siberi 
§ 3. Filamenta s dilata I de zequilata seu latiora et plus 
minus breviora: peo epi ra : pa 
is Calyx haud ultra Sn re 
4. M. Fewpuert (sp. nov.): foliis subtus cauleque levibus supra cum 
-appresse hispidulis, caulinis oblongo-lanceolatis ; racemis pauci- 
reckon corolle tubo lobis calycis hirsuti lato-lanceolatis limboque vix 
gore basim aera New Mexico: foot of hills 
Pe Gre Fae Fen Discus pl. m. bilobus, 
