24 MINNESOTA STUDIES IN PLANT SCIENCE 



when they displayed characters that remained constant in cultivation." 

 From descriptions of its habitat it appears to be a calciphobe species. 



Dr. Gray's (10, p. 39) original account reads: "Living plants of this 

 species were gathered by myself in the Allegheny Mountains of North 

 Carolina, and probably of Virginia, also, in the autumn of 1843, along with 

 those of S. Careyc-na, which this species so nearly resembles that the differ- 

 ence was not detected until both came into flower the ensuing spring." Dr. 

 Gray noted and distinguished the two species on the characters of their 

 filaments (Plate VIII). 



Distribution. — Mountains of Virginia and North Carolina. 

 Specimens examined : 



West Virginia: about Chatham Hill Gap, on Walker Mountain, Smyth County, 

 alt. 3,000 ft., June 13, 1893, John K. Small (MBG 84288, 84292). (The above two col- 

 lections are both labeled Saxifraga caroliniana) . UMH, as S. Grayana! 



North Carolina : Negro Mountain, June 27, 1879, Gray, Sargent, Redfield, No. 

 11791 (Redfield herbarium), (MBG 84291). 



Saxifraga Hallii, sp. nov. 



Ovarium parve inferiore, carpidia conica aliquam elongata erecta dorso 

 plus minusve 1-costato superne in stylos gradatim contracta base constricta 

 glandula crassa convolutaque cincta, stigmatibus globosis, filamentis clavatis 

 ad maturitam evidente subulatis calyce conspicue longioribus, sepalis maxime 

 reflexis oblongis vel ovato-oblongis 1.5-3 mm. longis, dorso margineque 

 sparse pubescente, petalis ellipticis vel ovato-ellipticis apice rotundatis base 

 plus minusve contractis, folia basalia 7 cm. longa ovata vel elliptico-ovato 

 aliquam crassa in feme pallida glabra vel margine minime ciliata sinuato- 

 dentata in petiolum alatum cuneate contracta petiolo lamina longiore vel 

 aequale, scapus erectus 40 cm. altus sparse glandulo-pubescentis. 



Ovary slightly inferior; carpels conical, somewhat elongate, erect, with 

 a more or less evident dorsal rib, gradually contracted above into the styles, 

 constricted at the base, and surrounded by a thick, convolute gland ; stigmas 

 globose ; filaments clavate, at maturity evidently sublate, conspicuously 

 longer than the calyx; sepals strongly reflexed, oblong or ovate-oblong, 

 1.5-3 mm. long, sparsely pubescent on back and margin; petals elliptic or 

 ovate-elliptic, rounded at the apex, more or less contracted at the base ; 

 leaves basal, 7 cm. long, ovate or elliptic-ovate, rather thick, pale beneath, 

 glabrous or slightly ciliate on the margins, sinuate-dentate, cuneately con- 

 tracted into a broadened petiole, the blade exceeding or equalling the petiole ; 

 scape erect, 40 cm. high, sparsely glandular pubescent. 



The leaves of this species are very similar to those of "Saxifraga inte- 

 grifolia Hook.," but the floral structures are all typical of the section Der- 

 masea. The bracts possess tufts of long hairs on the margins, or are 



