32 New or Rare Plants from the Rocky Mountains. 



em parts of Europe. Though possessing many of the 

 characters of Rumex, it appears to differ sufficiently to be 

 considered as a distinct genus. Wahlenberg supposes it to be 

 a Rheum with a third part of the fructification suppressed. 

 The American plant may yet prove a different species from 

 the European ; being much smaller, the flowers uniformly 

 diandrous, and the leaves not emarginate; in which case it 

 may be called O. diandra. 



3. Adoxa Moschatellina L. 



Peduncle about 4 flowered. Stamens 8 ; filaments united in 

 pairs at the base ; anthers subrotund, 1 -celled, (or, rather, 

 as Hooker is disposed to consider them — stamens 4, forked ; 

 each ramification bearing a single-celled anther). Calyx 

 3- cleft. Corolla 4-cleft ; segments ovate. Styles 5. 



Hab. With the preceding. 



Obs. This plant, the only species of the genus, is now for the 

 first time introduced as a native of the continent of Ameri- 

 ca. The specimens presented to me by Dr. James, resem- 

 ble in almost every respect those in my herbarium from 

 various parts of Europe. 



4. Potentilla nivalis.* Tab. III. f 2. 

 P. caule erecto herbaceo apice unifloro, foliis pinnatis, 

 foliolis 2-3-lobis confluentibus. lobis acutis, margiue piloso- 

 ciliatis, petalis subrotundis calyce longioribus. 



Description. 

 Root perennial, creeping, thick, and fuscous. Stems few, 

 simple, about 3 inches high, minutely pubescent, 1-flowered 

 at the summit ; base covered with the withered leaves of 

 preceding years. Radical haves numerous, equally pinnate, 

 many-paired; petiole winged by the decurrent stipules; 

 leaflets crowded and a little overlapping each other, so as 

 to appear imbricate, puncticulate, the lower ones ovate, 

 often entire ; upper ones broader, 2-, and often equally 

 3 lobed ; lobes somewhat spreading, acute, entire, naked. 



