338 PROCEEDINGS OF THE AMERICAN ACADEMY 



rirnis tubo turbinate brevioribus ; petalis l^ete roseis ; ovario cum styli 

 basi hirsutissirao; drupa sicca subglobosa pubera. — Foot-hills of the 

 eastern side of the Sierra Nevada, near Carson : fl. March, Dr. C. L. 

 Anderson. [Also collected by Dr. Torrey.] " About 3 feet high." 

 Flowers showy ; the petals apparently of nearly the color of peach- 

 blossoms, 4 lines long, entire. Lobes of the calyx broadly triangular 

 and obtuse, at length oblong. Stamens as long as the petals, 25, tri- 

 seriate, but approximate. Drupe half an inch long. 



HoRKELiA BoLANDERi : humilis, cosspitosa ? vej humifusa e cau- 

 dice lignescente ; foliis pube molli densa villoso-incanis ; foliolis 13-21 

 cuneatis palraatifidis, lobis 3-5 ovatis oblongisve ; stipulis angusto- 

 linearibus integerrirais ; cyma parva densillora ; calycis alte 5-fidi 

 segraentis accessoriis oblongis quam vera latiora subdimidio breviori- 

 bus ; petalis obovatis vix unguiculatis ; filameutis lanceolatis. — Dry 

 alkaline soil, near Clear Lake, coll. January, 1863, Bolander. Only 

 winter specimens known ; the flowering stems rising 3 to 5 inches 

 above the lignescent and tufted leafy base. This and the following 

 are among those species which go far to justify the views of Bentham 

 and Hooker, and now also of Engelmann, who would combine Horkelia 

 and Ivesia with Potentilla. I am reluctant to adopt this conclusion, 

 but have chosen a specific name which is not preoccupied in the latter 

 great genus. 



Ivesia tridentata {Horkelia tridentata, Torr. Bot. Whippl. t. 6) : 

 pube mollissima villosa ; caulibus patentibus vel erectis (pedalibus) 

 gracilibus apice nudis ; foliis junioribus argenteo-sericeis, adultis sub- 

 glabratis ; foliolis 5-11 subdissitis oblongo-cuneatis apice plerumque 

 tridentatis ; stipulis pauci-laciniatis vel subintegris ; cymis peduncu- 

 latis confertifloris ; pedicellis evolutis florem adtequantibus ; calycis 

 carapanulati segmentis accessoriis linearibus tubo sequilongis quam vei'a 

 acutissima brevioribus ; petalis (albis) breviter unguiculatis ; sta- 

 minibus 10 ; carpellis 5 - 10 ? — In the Sierra Nevada. The chai'acter 

 is here drawn up from the very beautiful and complete specimens col- 

 lected by Mr. Bolander, in 18G6, in the region near Mount Dana. 

 The stems are about a foot high and erect or nearly so. Leaflets of 

 the earlier radical leaves- inclining to obovate, of the stem-leaves (re- 

 duced to 1 - 3 pairs) verging to linear-cuneate : some of the ujiper 

 stipules entire. The narrow filaments are adnate to the calyx-tube 

 up to the sinuses and base of the lobes, and are thus distant from the 

 (villous) receptacle, as in Horkelia and Ivesia generally, but not in 



