JOHNSON: A REVISION OF THE SECTION BORAPHILA 55 



Gland a fleshy, more or less verrucose or convoluted, flattened disc, its lower 

 margin persisting as a thin flange around each follicle, and slightly elevated 

 above the base of the calyx.. Filaments subulate, flattened, uncinate ; anthers 

 oblong, somewhat contracted above, the margins at length purple. Sepals 

 mostly broad, oblong to triangular-ovate, 1.5-2.5 mm., obtuse to rounded 

 and sometimes retuse at the apex, slightly united at the base ; lateral nerves 

 usually 2, variously branched, sometimes coalescing with the mid-nerve 

 below the apex; entire, glabrous, sometimes irregularly denticulate, spread- 

 ing. Petals 2.4 mm., white, broadly orbicular or ovate, to spatulate or ellip- 

 tic-lanceolate ; base broad, clawlike in orbicular forms ; mid-nerve with 2-4 

 branches which are often variously forked and coalescent. Leaves basal, 

 small, glabrous ovate to elliptic-lanceolate, 6 cm. long or less, abruptly to 

 gradually contracted into a narrow, flattened, petiole-like base mostly 

 shorter than the blade; margins of blades sinuate to shallowly crenate- 

 dentate, ciliolate or eciliolate. Scapes 7-20 cm. high, slender to stout, soli- 

 tary or several together, rather sparsely glandular-pubescent, the hairs 

 commonly elongated, uniseriate. Inflorescence contracted, paniculate-cymose 

 or merely cymose, sometimes capitate, the cymules glomerate; lowest 

 branches usually shorter than the internodes in branched inflorescences. 

 Perennial from a short fibrous-rooted caudex which often produces several 

 short shoots. 



The species has sometimes been referred to 5". virginiensis from which, 

 however, it can easily be distinguished by the carpels and especially by the 

 mature follicles, the number of which is generally three, as noted above. 

 The two species differ also strongly in seed characters (Plate XVIII). 



Distribution. — From southwestern Missouri to the region of Dallas in northeastern 

 Texas. 



Specimens examined : 



Missouri: Reding's Mill, April 8, 1909, B. F. Bush, No. 5475 (MBG 84597); 

 Reding's Mill, Newton County, local in chert barrens, April 9, 1909, Ernest J. Palmer, 

 No. 1647 (MBG 760519). 



Texas : Terrell-Elmo, April 6, 1903, /. Reverchon, No. 3729 (MBG 84557) ; black 

 sandy land, between French Town and Dallas, /. Reverchon, No. 281 (MBG 84556) ; 

 Brazos County, sandy land, March 10, 1900, N. Ness. No. 1994 (MBG 84554) ; damp 

 sands, Elmo, April 6, 1903, /. Reverchon, No. 3729 (MBG 84555). 



No state cited, February 27, 1878. /. F. Joor (MBG 845S2) ; ex herbarium, 

 7. Reverchon (MBG 84552). 



Section Arabisa Tausch, Hort, Canal, Fasc. 1. 1823. 



Spatularia, Haworth, Saxifr. Enum. 47. 1821. 



Gymnopera, D. Don, Trans. Linn. Soc. 13:343. 1822; in part. 



Arahidia Seringe, DC. Prodr. 4:40. 1839; in part. 



Hexaphoma, Raf., Fl. Tell. 2:66. 1836. 



/fyrfaffca. Neck. Elem. 2:387. 1790. Small, N. Am. Fl. 22 :2 :148. 1905. 



Boraphila, Engler, Verb. Zool.-Bot. Ver., Wein. 19:521. 1869; in part. 



