CALIFORNIA ACADEMY OF SCIENCES. 75 



rather rare. The only white flowered species, the rest being 

 rose or purple. 



S. malvaeflora, Gray. 



Stems 2 — 4 feet high, erect or a little decumbent, mostly 

 solitary, from a fusiform root : hirsute below, and on the 

 calyx and pedicels : short, stellate pubescence wanting : leaf- 

 margins ciliate : radical leaves orbicular with open sinus and 

 5 — 9 shallow, crenate-incised lobes : the uppermost cauline 

 5 — 7 -parted into linear, entire segments: raceme mostly sol- 

 itary, virgate : pedicels erect, twice the length of the calyx, 

 the lobes of which are broadly ovate, acuminate: carpels 

 smooth, depressed. PL Wright. I, 16. S. Neo-3fexicana, 

 Gray. PI. Fencll. 23. 



We have no Sidalcea specimens from any part of Califor- 

 nia or the regions northward which are not pretty readily 

 distinguishable specifically from this plant of Colorado, 

 New Mexico and Arizona. It is to be hoped that the Sida 

 malvcefiora, M09 & Sesse, of Mexico is really the same 

 thing; but otherwise the name S. Neo-Mexicana is to be re- 

 stored to this. In the Plantae Wrightiame it is said to 

 attain the height of eight feet, which I am less disposed to 

 regard as an exaggeration, since Dr. Rusby's specimen from 

 the northern part of Arizona measures more than four feet, 

 and has cauline leaves eight inches in diameter. 



-5 — s— Root tuberous-enlarged; stems mostly clustered and de- 

 cumbent at base. 



++ Pubescence (as in the two preceding species) hirsute only. 



S. humilis, Gray. 



Hispid-hirsute especially on the pedicels and calyx : stems 

 stout, ascending, simple, about a foot high: radical leaves 

 round, with open sinus; cauline 5 — 7-parted, their segments 

 obtuse, 3-lobed at apex: raceme long and loose: petals ob- 

 cordate, fully an inch long, rose-purple: pedicels stout: 



