288 PHANEROGAMOUS PLANTS. 



7. HORKELIA, Cham. & Schlecht. 



1. Horkelia California, Cham. & Schlecht. 



Hab. Ravines near San Francisco, California. — Cal ycine appendages 

 variable, sometimes shorter, but often longer than the segments; often 

 trifid. Petals nearly as long as the calyx, white, obtuse, with scarcely 

 any claw. Disk smooth. Filaments less dilated than in the other 

 species, with a grooved ridge on the face : anthers linear-oblong. 

 Styles slightly curved at the summit. Chamisso and Schlechtendal 

 state that the filaments which are opposite the petals fall away with 

 those organs, but we have not observed this to be the case in any of 

 the species which we have examined. 



2. Horkelia congesta, Hook. 



Hab. Southern Oregon and Northern California. — The species 

 includes H. hirsuta of Lindley. The petals vary in size and form. 



8. I V E S I A, Torr. & Cray. 



1. Ivesia Pickeringii, Torr. & Gray. (Tab. 4.) 



I. {Albiflora3 15-20-andrce ; caulibus gracilibus magis foliatis ; cyma 

 paniculata ; foliis albido-lanatis primum saltern myosuroideis ; fila- 

 mentis gracillimis) : pedalis; foliolis demum patentiuscidis 3-5-par- 

 titis sectisve, segmentis oblongis ; pedicellis calyce (fructifero oblongo- 

 campanulato) brevioribus; lobis accessoriis calycis ovato-lanceolatis ; 

 staminibus 20 rnanifeste tri-seriatis ; antlieris mucronidatis ; car- 

 pellis 4-6. 



Ivesia Pickeringii, Torr. & Gray in Newberry, Rep. Pacif. R. R. Expl. 4, p. 72 ; 

 Gray in Proceed. Amer. Acad. 6, p. 531. 



Hab. Northern California, on the Klamath River. — An interest- 



