50 PITTONIA. 
. §.TURBINATA. Geum turbinatum, Rydb. Bull. Torr. Club. 
xxiv. 91 (1897). Inhabiting the Rocky Mountains from 
Arizona and New Mexico northward. 
S. SERICEA. Geum sericeum, Greene, Pitt. iii. 172 (1897). 
From the Ruby Mountains, Nevada, to Montana. 
These three species, S. Rossii, turbinata and sericea, while 
at agreement with the generic type in point of habit, and in 
the continuity and persistency of the styles, fail to show the 
plumose characters in this organ. They may be compared 
to such species of Clematis as C. Pitcheri and crispa, in which 
the feathery hairiness of the styles also fails; but no one 
doubts their title to membership in the genus Clematis. 
S. ROTUNDIFOLIA, Ch. & Schl. in Linnea, ii.4(1827). Geum 
rotundifolium, Langsd. in DC. Prodr. ii. 15 (1825). Here we 
have a northwestern and insular Sieversia with foliage more 
like that of Geum ; but the styles are continuous, and also 
distinetly though rather lightly feathery. 
S. cILIATA, G. Don, Gen. Hist. ii. 528 (1832), also S. triflora 
of the same. Geum ciliatum, Pursh, Fl. i. 352 (1814), also 
G. triflorum of the same, ii. 736. Our most common species, 
extending across the continent northward along the bound- 
ary between the United States and British America ; in the 
western mountain distriets and high prairie regions occur- 
ring as far south as Missouri and Arizona; if Pursh's G. 
ciliatum and triflorum be one and the same species; which 
there may be reason for doubting. 
VANCLEVEA, 
Low tufted desert shrub, with the habit of certain species 
of Chrysothamnus, nearly ; but bracts of the turbinate invo- 
lucre wholly herbaceous, and very gummy as in Grin- 
delia. Rays none. Disk-corollas claviform, with 5 short 
