240 LOASACE.E. mentzelia. 



petals 5 : filaments all filiform or the 5 outer more or less di- 

 lated : capsule linear : leaves sessile, flat, sinuately toothed or 

 pinnatifid : annuals. 



M. albicaulis Dougl. Don Mill, iii, 61 . Slender, 3-12 inches high or 

 more : leaves linear-lanceolate, pinnatifid with numerous narrow lobes, 

 the upper leaves broader and often lobed or toothed at base only : flowers 

 mostly approximate near the ends of the tranches : calyx-lobes 1^-2 

 lines long, a little shorter than the spatulate or obovate petals : filaments 

 not dilated : capsule linear-clavate, 6-9 lines long: seeds numerous, rather 

 strongly tuberculate, irregularly angled with obtuse margins less than 

 half a line long. On sandy plains, Brit. Columia to California. 



M. _ dispersa Wat. Proc. Am. Acad, xi, 115 & 137. Stems slender annual, 

 4-12 in. high, leaves narrowly lanceolate, sinuate-toothed or sometimes 

 entire, the uppermost often ovate; flowers small mostly clustered near the 

 ends of the branches ; calyx lobes a line long, little shorter than the 5 

 spatulate or obovate petals; capsule narrowly linear-clavate, 6-9 lines long ; 

 seeds often in a single row, angular and somewhat rhombohedral, more or 

 less grooved upon the angles, very nearly smooth, half a line long. East- 

 ern Oregon to California. 



M. gracilenta T. & G. Fl. i, 534. Stems pubescent 12-18 inches 

 high: leaves narrowly lanceolate muricate-scabrous, pinnatifid, the 

 lobes short, obtuse : flowers usually clustered at the summit; calyx-lobes 

 2-5 lines long; petals obovate to oblanceolate, 4-8 lines long, capsule 

 linear clavate 6-12 lines long; seeds in three rows irregularly angled, 

 minutely tuberculate. Idaho to California. 



M. congesta T. & G. 1. c. Slender, a foot high ; leaves linear-lanceo- 

 late, pinnatifid with numerous narrow lobes, the upper leaves broa er and 

 often lobed or toothed at base only : flowers clustered at the ends of the 

 branches, conspicuously bracted with broad toothed bracts, which are 

 membranaceous at base : calyx-lobes 1)^-2 lines long: petals bright orange, 

 3-6 lines long: filaments all filiform: capsule clavate, half an inch long: 

 seeds irregularly angled, minutely tuberculate, nearly a line long. Inter- 

 ior of Oregon to California and Nevada. 



§ 2. Bartonia T. & G. FL i, 535. Seeds numerous in 

 double rows upon the 3 broad placentae, horizontal, flattened, 

 suborbicular- winged, minutely tuberculate or nearly smooth : 

 flower& often large and showy: calyx-limb 5-cleft nearly to the 

 base: petals 5 or 10: filaments numerous, the outer often more 

 or less dilated or petaloid : capsule broad, oblong : leaves sessile, 

 sinuately toothed or pinnatifid: biennials. 



M. laevicaulis T. & G. 1. c. 535. Stout 2-3 ft. high, branching: leaves 

 lanceolate, 2-8 inches long: flowers sessile on short branches, very large, 

 light yellow, opening in sunshine : calyx-tube naked, the lobes 12-15 lines 

 long : petals acute at each end, 2-2}4 inches long, the filaments and slender 

 style a little shorter : capsule 15 lines long, 3-4 lines in diameter: seeds 

 very minutely tuberculate. On gravelly bars, Brit. Columbia to Cali- 

 fornia. 



M. Brandegei Watson Proc. Am. Acad, xx, 367. Stem branching, a foot 

 high : leaves linear, pinnatifid with narrow lobes, 1-3 inches long; the 

 bracts on the short pedicels mostly entire, very narrow : flowers in open cor- 

 ymbs : calyx-lobes 6-8 lines long, the 5 narrowly oblanceolate petals an inch 

 long or more : stamens about 30, a little shorter, none petaloid: capsule 

 narrowly oblong, 7-9 lines long by nearly 8 lines wide: seeds horizontal, 

 flattened, with somewhat angular or rugose sides and narrow scarcely 

 winged margin. Yakima County, Washington. 



