6oo 



ONAGRACEAE. 



Vol. II. 



I. Kneiffia linifolia (Nutt.) Spach. 

 Thread-leaved Sundrops. Fig. 3049. 



Oenothera linifolia Nutt. Journ. Acad. Phila. 2 : 



120. 1821. 

 Kneiffia linifolia Spach, Nouv. Ann. Mus. Par. 4 : 



368. 1835. 



Erect, very slender, simple or branched. 

 6'-i8' high, glabrous or nearly so below, finely 

 pubescent above. Stem-leaves filiform-linear, 

 entire, crowded, 6"-i5" long; basal leaves 

 tufted, oblanceolate or spatulate, petioled, 

 about i' long; flowers in loose spike-like ra- 

 cemes, yellow, diurnal, 3"-4" broad ; calyx- 

 lobes short, reflexed, the tube about i" long, 

 rather shorter than the ovary; stigma-lobes 

 very short ; capsule obovoid, sessile or very 

 nearly so, puberulent, sharply 4-sided but not 

 winged, 2"-3" long. 



In dry soil, Illinois to Kansas, south to Geor- 

 gia, Louisiana and Texas. May-July. 



2. Kneiffia Alleni (Bntion) Small. Allen's 

 Sundrops. Fig. 3050. 



Oenothera fruticosa var. htimifusa Allen, Bull. Torr. 



Club I : 3. 1870. Not Oe. humifusa Nutt. 1818. 

 Kneiffia linearis Alleni Britton, Mem. Torr. Club 5 : 235. 



1894. 

 Kneiffia Alleni Small, Bull. Torr. Club 23 : 177. 1896. 



Low, perennial, finely appressed-pubescent, stems 

 decumbent, at length diffusely branched, 3'-2° long, 

 wiry and zigzag. Leaves oblanceolate to lanceolate, 

 V-il' long, usually obtuse, undulate, sessile or short- 

 petioled; flowers yellow, about S'-i' broad; racemes 

 I '-2' long, usually interrupted; calyx villous, its tube 

 2"-3" long, striate, its segments linear-oblong, as 

 long as the tube; petals orbicular-obovate, notched 

 at the apex ; capsules club-shaped, 3"-4" long, winged, 

 shorter than the pedicels ; seeds obovoid, to oblong, 

 i" long, minutely pitted in rows. 



In sand, eastern Long Island. Probably a decumbent 

 race of K. linearis. June-Aug. 



3. Kneiffia longipedicellata Small. Long- 

 stemmed Sundrops. Fig. 3051. 



Kneiffia longipedicellata Small, Bull. Torr. Club 23 : 



178. 1896. 

 Oenothera longipedicellata Robinson, Rhodora 10 : 



34. 1908. 



Perennial, slender, more or less puberulent; 

 stems erect or assurgent, i°-2i° tall, red, sim- 

 ple or sparingly branched above. Basal leaves 

 spatulate or obovate-spatulate, i¥-z' long; stem- 

 leaves few, linear-lanceolate i'-2¥ long, obtuse 

 or acutish, entire, sometimes undulate, short- 

 petioled ; flowers yellow, i'-2' broad; racemes 

 i'-4' long; calyx hirsute, its tube slender, s"-/" 

 long, its segments nearly linear, longer than the 

 tube, the tips free in the bud ; petals obovate, 

 emarginate; capsules narrowly obovoid, the bodies 

 about 5" long, their angles with stout pubescent 

 wings, their faces ridged, the pubescent pedicel 

 longer than the body; seeds irregular, less than 

 4" long, minutely papillose. 



Moist soil, Connecticut to West Virginia and Flor- 

 ida. May-Aug. 



