172 ONAGRACEAE. 



short-petioled, glabrous or puberulent, 2-6 cm. long; flowers red, in corymb- 

 like racemes; petals about 20 mm. long, the broad blades 3-lobed, the long 

 claw with a slender tooth on each side; inner four anthers rudimentary; 

 stigma-lobes much dilated; capsule oblong, truncate at apex, 2-3 cm. long, 

 puberulent, stout-pedicelled. Common on the prairies. 



Clarkia rhomboidea Dougl. Slender, erect, usually simple, 15-60 cm. 

 high, puberulent; leaves broadly lanceolate, acute at each end, entire, 1-4 

 cm. long, slender-petioled; flowers few, scattered; petals rhomboidal, entire, 

 about 1 cm. long, the claw often toothed; stamens all perfect; filaments with 

 hairy scales at base; capsules stout, 4-angled, acuminate, nearly sessile, 2-3 

 cm. long. In dry open woods. 



244. BOISDUVALIA. 



Erect leafy annual herbs; leaves alternate, sessile, simple; 

 flowers small, in leafy simple or compound spikes; calyx-tube 

 funnelform above the ovary, 4-lobed; petals 4, 2-lobed, purple or 

 white; stamens 8, those opposite the petals shorter; anthers 

 attached near their bases, erect; ovary 4-celled, several-ovuled ; 

 capsule membranaceous, ovate-oblong to linear, nearly terete, 

 acute, sessile, dehiscent to the base; seeds 3-8, in one row in 

 each cell. 



Upper leaves much shorter than the lower ones; capsule 



septifragal. B. densiflora. 



Upper leaves about as long as the lower ones; capsule loculicidal. 



Leaves narrowly lanceolate, pubescent. B. stricla. 



Leaves ovate-lanceolate, often glabrous. B. glabella. 



Boisduvalia densiflora (Lindl.) Wats. Erect, simple or with a few branches 

 below, hoary-puberulent throughout or nearly glabrous, 30-90 cm. high; 

 lower leaves lanceolate, acuminate, denticulate, 2-6 cm. long; upper leaves 

 gradually shorter and sometimes broader, ovate, acuminate, nearly entire, 

 crowded; spikes dense; corolla 6-8 mm. broad, purplish; capsules oblong, 5-8 

 mm. long, the partitions not adherent to the valves in dehiscence; seeds 3-6 

 in each cell. Common in low ground, variable. 



Boisduvalia stricta (Gray) Greene. Erect, simple or rarely branched 

 below, villous throughout, 30-40 cm. high; leaves all alike, lanceolate, acute, 

 entire or denticulate, 2-3 cm. long; flowers in the axils of the upper leaves 

 and occasionally of the lower also; corolla 2-3 mm. long, purplish; capsules 

 slender, acuminate, 8-10 mm. long; partitions adherent to the valves; seeds 

 6-8 in each cell. Growing with B. glabella and in similar places. 



Boisduvalia glabella (Nutt.) Walp. Erect and simple or more commonly 

 branched at base and decumbent, 10-30 cm. high, leafy, densely villous to 

 glabrous; leaves all alike, ovate-lanceolate, acute or acuminate, serrate or 

 dentate, 1-2 cm. long; flowers sessile in the upper axils, occasionally also in 

 the lower ones, shorter than the leaves; corolla purplish, 2 mm. long, capsules 

 fusiform, tapering from a broader base, 6-7 mm. long, the partitions adherent 

 to the valves; seeds 4-6 in each cell, somewhat fusiform. Common in the 

 bottoms of dried ponds. Puzzling intermediate forms occur between this 

 and B. siricla. 



245. GAYOPHYTUM. 



Very slender caulescent branching annuals; leaves alternate, 

 linear, entire ; flowers axillary ; calyx-tube not prolonged beyond 



