OF ARTS AND SCIENCES: JUNE 11, 1867. 339 



Potentilla. Carpels in these specimens usually 5. I have not found 

 so many as 10 ; although Dr. Torrey's figure represents a larger num- 

 ber, and also omits the villosity of the receptacle. This species is 

 certainly embarrassing to the maintenance of these genera; but it ranks 

 with Ivesia, although the foliage is anomalous. 



Ivesia unguiculata : laxe villosa, subpedalis ; foliolis perpluri- 

 mis quasi-verticillatis laxis plerisque bis-bipartitis, segmentis linearibus ; 

 stipulis pauci-laciniatis vel integris ; floribus glomeratis ; pedicellis 

 brevissimis ; calycis segmentis accessoriis linearibus vera triangulari- 

 lanceolata acutissima fere adaequantibus ; petalis dilatato-cuneatis longe 

 tenuiter unguiculatis ; staminibus sub-15, filamentis filiformi-subulatis ; 

 carpellis 5 - 8. — Westfall's Meadows, Yosemite Valley, alt. 8,000 feet, 

 in wet places, Bolander. Stems in tufts from a thickish caudex, from 

 a span to a foot high. Leaves in aspect not unlike those of Horkelia 

 tenuiloba, but the leaflets crowded much like those of Ivesia Gordoni, 

 and whitish-silky or villous with long very soft hairs when young, 

 but glabrate with age. The leaflets are 2 or 3 lines long, more com- 

 monly twice 2-parted into linear or linear-spatulate divisions, some of 

 them simply 3-parted, others 2-parted, and the divisions cuneate and 

 2-cleft. Stipules lanceolate, acuminate and nearly entire, or broader 

 and cut into 2 or 3 lanceolate lobes. Cymes or dense clusters short- 

 peduncled. Calyx 3 lines long, deeply cleft. Petals 2 lines long, 

 the slender claw more than half the length of the broadly cuneate- 

 obovate lamina. Stamens shorter than the calyx, one inserted before 

 each petal and one each side of it, i. e. two to each true calyx-lobe, 

 not before its centre but lateral. The arrangement is, perhaps, more 

 clearly expressed by saying that, when 15, ten are alternate with the 

 ten calyx-lobes, counting the accessory ones, and five are opposite the 

 latter. These five appear to be always present ; but one or two, or 

 even three or four, of the ten are occasionally wanting. Receptacle 

 sparingly villous. 



Ivesia santolinoides (Gray, Proceed. Amer. Acad. 6, p. 531), 

 char, suppl. : spithamsea ad pedalem ; cyma demum effusa ramossissima, 

 ramulis pedicellisque capillaribus ; achenio subreniformi-globoso utricu- 

 lato calycem fructiferum implente. — From fine fruiting specimens 

 gathered by Bolander, on dry rocky hills along the Merced River, above 

 the Yosemite Valley, alt. 9,000 feet. The inflorescence becomes pa- 

 niculate, exceedingly effuse and decompound, and the pedicels generally 

 from a quarter to half an inch in length. Petals orbicular, sessile. 



