n 



10 



PITTONIA. 



exterior]}', white or yellowish within, yielding abundantly the 

 usual reddish oil : stem branched from the very base, the 

 branches diffuse or reclining, 3 to 5 feet long, abundantly 

 floriferous ; herbage purplish and glaucous : radical leaves 2 

 feet long, bi- or tripinnate : leaflets 2 inches long, lanceolate, 

 somewhat cuneate below and entire, but' from below tlie 

 middle bearing rather remote short but salient serrate teeth : 

 flowers dull : fruit orbicular : the ribs very broad and low, 

 the oil-tubes small ; cross-section of seed nearly reniform. 



Growing among driftwood in an estuary of Lake Pend 

 d'Oreille, Idaho Territory, 9 August, 1889. The flower and 

 fruit much as in C. pvrpurnfa, but in root character very 

 different, as also in mode of growth, the stout long straggling 

 and somewhat flexuous branches spreading over an area of 

 SIX or eight feet. The parent rhizome being exhausted and 

 in an advanced stage of decay at fruiting time, the plant was 

 sustained and supported by large and long tough-fibrous 

 accessories. At the same time the several young offsets at 

 the base were well grown, and furnished the leaves from 

 which the description is drawn. 



I refer here, but somewhat doubtfully, tlie plant of the 

 marshes in Modoc County, California, to which reference i» 

 made in the first volume of these papers under the name C. 

 virosa. I consider it possible tJiat the name Sium Douglasii 

 may belong to this plant ; but whether to this, or to C. pur- 

 pvmfft, or to some other species different from both, it may 

 be forever impossible to determine. Nor should I be sur- 

 prised greatly if the Mono County plant of Bolander, referred 

 to under C. occidcntalis, were found to exhibit the root- 

 characters of the present species, and became referable to it. 

 It has much the same kind of fruit. 



8. C. Califorxica, Gray, Proc. Am. Acad. vii. 3M; C. 

 virosa, var. Californica, Coult. & Rose. Revis. Umb. 130. 

 Ehizome freely branching, the branches G inelies to a foot 

 long, a half-inch or more in thickness below, where the inter- 

 nodes are two or three inches long, above (under the aerial 



