106 PITTONIA. 
/28. P. SANTOLINOIDES — Ivesia santolinoides, Gray, l. c. 
vi 531 (1865); Brew. & Wats. l. c. 
'29. P. Mumi = Ivesia Muirii, Gray, L c. viii. 627 (1873); 
Brew. & Wats. l. c. 
'80. P. Gorpont — Horkelia Gordoni, Hook. in Kew 
Journ. Bot. v. 341, t. 12 (1853); Ivesia Gordoni, Torr. & 
Gray, Pac. R. Rep. vi 72 (1855); Brew. & Wats. k c. — 
Calyx campanulate: petals small, narrow and acute. The 
var. lycopodioides is but a reduced alpine state of the species, 
but the next is widely different. 
‘31. P. pEOIPIENS = Ivesia pygmea, Gray, L c. vi. 531; 
I. Gordoni, var. pygmæa, Wats. Bot Cal i 183. — 
Calyx rotate, or very nearly so; petals oblong-obovate, 
retuse or emarginate, twice as large as in the last; filaments 
subulate.—In habit and foliage just like the alpine form of 
the last, but the herbage glandular, as was said by Dr. Gray, 
in the original character ; but these resemblances could not 
have blinded the eyes of a botanist to the striking floral 
characters, if his dried specimens even had been fair ones. 
As in P. Tilingi and purpurascens we have plants of the 
Horkelia phase running into Ivesia pletely,so here we have 
that which, although an Ivesia of the Ivesias at first sight, 
takes us back, by its calyx and filaments, to near our starting 
point amid the typical Horkelias. Even the inflorescence of _ 
this last species is, in its maturity open-cymose, almost as 
much so as in Potentilla Plattensis, in proportion to the size 
of the plant. I have not yet seen it growing, but excellent 
specimens, at several stages of growth, have been furnished 
by Mr. C. F. Sonne, of Truckee, Cal. 
A variety (?) of the Old World P. rupestris has borne, 
and may perhaps again claim the rank and the name of P. 
pygmeea, Jord. 
