JOHNSON: A REVISION OF THE SECTION BORAPHILA 45 



Oregon: the Dalles, Wasco County, April 19, 1902, E. P. Sheldon, No. 10109 

 (UMH and MBG 83872). 



Saxifraga gracillima sp. nov. 



Receptaculum ovario infra medium adnatum, ovariis depressis in 

 glandula latissima profunda insertis, folliculi parvi inflati, superne valde con- 

 tracti, stylis primum gracillimis demum plus minusve abbreviatis divergenti- 

 bus, stigmatibus globosis, filamenta subulata apice valde incurvata carpidiis 

 supercurrentia, sepala parva ovatave cuneata base minime coalita 1-nervia, 

 petala elliptica vel elliptico-lanceolata sepalis multi longiora base valde con- 

 tracta. 



Receptacle adnate to the ovary below the middle; ovary depressed, 

 inserted deeply in a very broad gland ; follicles small, inflated, strongly con- 

 tracted above styles, at first very slender, at length shortened and recurving, 

 globose; filaments subulate, strongly incurved at apex and exceeding the 

 (young) carpels ; sepals small, ovate or cuneate, slightly united at the base, 

 1-nerved; petals elliptic or elliptic-lanceolate, much longer than the sepals,- 

 strongly contracted at the base. 



Leaves basal, 1.5-5 cm., ascending-spreading, ovate, smaller, sometimes 

 elliptic, coarsely serrate-dentate, thin, acute, sometimes purplish, margins 

 ciliolate or not at all so, abruptly contracted into a very slender petiole about 

 equalling or sometimes exceeding the blades. Scapes erect or assurgent, 

 very slender to delicate, commonty solitary, 15-22 cm. high, thinly glandu- 

 lar-pubescent, cormybosely branched above; branches of the inflorescence 

 few and filiform; flowers white, conspicuous, not numerous, in loose, open 

 cymules. Bracts small to minute, especially the upper, sparsely-ciliolate on 

 the margins. Perennial from a short, slender, fibrous-rooted caudex. A 

 graceful, delicate species. The relatively large petals, very small carpels 

 and calyx-lobes, and the strongly serrate-dentate leaves with their slender 

 petioles are the most obvious characteristics. The shallow receptacle gives 

 the appearance of a hypogynous condition with age. There is great varia- 

 tion in the size of the petals in different flowers. Mature fruit not seen 

 (Plate XIV). 



Distribution. — Known only from type locality. 



Specimens examined: 



California: Canon of Big Chico Creek, Butte County, March 19, 1914, A. A. 

 Heller, No. 11214, as Micranfhes calif arnica (Greene) Small, Type (UMH, MBG 

 745924). Plants on MBG sheet smaller than the specimens in the Herbarium of the 

 University of Minnesota. 



Saxifraga integrifolia Hook., Fl. Bor. Amer. 1 :249. 1840. 



This species appears to be a perplexingly polymorphic one. Such has 

 been the confusion in regard to it that identical forms have been variously 



