338 PROCEEDINGS OF THE AMERICAN ACADEMY 



rimis tubo turbinate* brevioribus ; petalis lrcte roseis ; ovario cum styli 

 basi birsutissimo; dru pa sicca subglobosa pubera. — 'Foot-bills 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, crespitosa ? vel humifusa e cau- 

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

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

 linearibus integerrimis ; cyma parva densiflora ; calycis alte 5-fidi 

 segmentis accessoriis oblongis quam vera latiora subdimidio breviori- 

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

 alkaline soil, near Clear Lake, coll. January, 18G3, Bolander. Only 

 whiter 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 (Horldia tridentctta, 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- 

 litis confertifloris ; pedicellis evolutis florem ada?quantibus ; calycis 

 campanulati segmentis accessoriis linearibus tubo gequilongis quam vera 

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

 minibus 10 ; carpellis 5 - 10 ? — In the Sierra Nevada. The character 

 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 upper 

 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 



