OF ARTS AND SCIENCES : MAT 30, 1865. 633 



MiTELLA (MiTELLARiA, licet stain. pctalis altera.) Breweri : foliis 

 omnibus radicalibus rotundato-reraiformibus incise duplicato-crenatis 

 brevi-petiolatis ; scapo (spithamaso) nudo ; calyce explanato 5-undu- 

 lato ; staminibus 5 petalis pectinato-pinnatifidis alternis. — Mount 

 Hoffmann, in a damp place, at the elevation of about 11,000 feet. The 

 outline and crenation of the leaves and the short (shaggy-hirsute) peti- 

 oles distinguish this at a glance from M. pentandra, with which it 

 accords in the structure of the flower, in the two two-lobed sessile 

 stigmas, &Q,. ; but here the very short filaments are inserted before the 

 calyx-lobes, instead of before the petals. This is all that was needed 

 thoroughly to suppress Drummondia of De Candolle {Mitellopsis, 

 Meisn.). 



Saxifraga bryophora: Arabidia, S. stellari et leucanthemifolicB 

 proxima; foliis abbreviatis oblanceolatis lineari-oblongisve aveniis inte- 

 gerrimis ciliatis sessilibus saspissime rosulatis ; scapis aphyllis panicu- 

 lato-ramosis, ramis elongatis flore unico perfecto terminatis, pedicellis 

 lateralibus plurimis racemosis filiformibus mox refractis proles gemmi- 

 formes (flores mutatos) gerentibus ; sepalis lato-ovatis ; petalis lanceo- 

 lato-ovatis basi abruptis bimaculatis ; stylis vix ullis. — Ebbett's Pass, 

 and on a peak near Mount Dana, alt. 9,000 feet, on wet rocks. — Leaves 

 half an inch or less than an inch long. Scapes a span high, usually with 

 divergent branches ; the fertile and gemmiferous pedicels half an inch 

 or less in length ; some of the gemmce are mere altered flower-buds ; 

 others are rosulate tufts from which a shoot is proceeding. This bears 

 much the same relation to S, leucanthemifoUa that S. stellaris var. 

 comosa does to ordinary S. stellaris. But the small and quite entire 

 leaves, and the reflexed filiform pedicels of the gemmae are peculiar. 



Some new materials and observations make it desirable to revise the 

 genus. 



LITHOPHRAGMA, Nutt., Torr., & Gray. 



* Petala lamina tripartita, segraentis angustis : folia omnia partita 

 vel infima lobata : radix (quandoque caulis) bulbillifera. 



1. LiTHOPHRAGMA GLABRA, Nutt. Glabella ; racerao axillisque 

 foliorum ssepe bulbilliferis ; pedicellis calyce campanijlato pubero lon- 

 gioribus ; ovario basi tantum calyce adnato ; seminibus muriculatis. — 

 Blue Mountains of Oregon, Nuttall. Pine forests on small tributaries 

 of the Upper Sacramento, California, Fremont. Rocky Mountains in 

 Colorado Territory, mixed with Saxifraga cernua, Hall and Har- 



VOL. VI. 60 



