572 LOASACEAE 



15 cm. long; flowers vespertine; petals 2 cm. long, oblanceolate, sometimes whit- 

 ish without, golden yellow within; staminodia about half their size; capsule fully 

 2 cm. long. M. aurea and M. speciosa Osterhout. Hills and dry valleys: Colo. 

 -Wyo. Submont. Mont. Jl-Au. 



12. N. chrysantha (Engelm.) Greene. Decumbent biennial 3-4 dm. high; 

 stems stout, white-pubescent, much branched; lower leaves 10-15 cm. long, 

 lanceolate or oblanceolate; upper leaves broadly lanceolate, or even ovate; petals 

 15-20 mm. long, oblanceolate; staminodia similar; capsule 2.5-3 cm. long. T. 

 sinuata Rydb. N. sinuata Daniels. Canons: Colo. Submont. S. 



13. N. Rusbyi (Wooton) Rydb. Erect biennial; stem stout, scabrous, 1-1.5 

 m. high; lower leaves long-lanceolate, 1-2 dm. long, sinuate-dentate, with tri- 

 angular teeth; flowers with two pinnatifid bracts; petals light yellow, oblanceolate, 

 acute, 16-20 mm. long; petaloid staminodia narrower and shorter; capsule 3 cm. 

 long, acute at the base; seeds winged. M. Rusbyi Wooton. Plains and valleys: 

 N.M. Wyo. Ariz. Son. Submont. Je-S. 



14. N. nuda (Pursh) Greene. Stout perennial or biennial; leaves oblance- 

 olate, 5-15 cm. long, sinuately lobed, with oblong or ovate lobes, less hispid 

 above; petals spatulate, acute, about 2 cm. long; staminodia nearly as large, 

 similar; capsule about 3 cm. long; seeds winged. Bartonia nuda Pursh. M. 

 nuda T. & G. Plains and hillsides: w Neb. Colo. Wyo. Plain Submont. 

 Jl-Au. 



15. N. stricta (Osterhout) Greene. Strict, rather simple perennial; stem 

 5-10 dm. high, branched above; leaves linear-lanceolate, 5-10 cm. long, sinu- 

 ately toothed, with triangular teeth; petals oblanceolate, acute, 2.5-3.5 mm. 

 long; petaloid staminodia similar; capsule 2-3 cm. long; seeds wing-margined. 

 Hesperaster strictus Osterhout. Plains and foot-hills: w Neb. Tex. Colo. 

 Wyo. Plain Submont. Je-O. 



16. N. decapetala (Pursh) Greene. Stout biennial; stem 5-10 dm. high, 

 leafy, very scabrous; lower leaves oblanceolate, 1-3 dm. long, the upper lanceolate, 

 pinnately lobed, with lanceolate lobes; flowers subtended by several pinnatifid 

 bracts; petals 45 cm. long, oblanceolate, acute; petaloid staminodia almost as 

 large; capsule about 4 cm. long; seeds with a narrow wing. Bartonia decapetala 

 Pursh. M. ornata T. & G. Canons: S.D. Tex. Nev. Alta. Plain Sub- 

 mont. Jl-S. 



17. N. laevicaulis (Dougl.) Greene. Stout biennial; stem 3-10 dm. high; 

 lower leaves oblanceolate, sinuately dentate, with triangular teeth, 1-1.5 cm. 

 long; upper stem-leaves ovate-lanceolate, densely scabrous; flowers diurnal, sub- 

 tended by toothed bracts; petals narrowly oblanceolate, 5-6 cm. long; seeds 

 wing-margined. Bartonia laevicaulis Dougl. M. laevicaulis T. & G. Canons 

 and river valleys: Wash. Ida. Utah Calif. Son. Submont. Je-Au. 



18. N. acuminata Rydb. Stout biennial; stem 3-10 dm. high, straw- 

 colored; lower leaves oblanceolate, 1-2 dm. long, sinuately dentate, densely 

 scabrous, with triangular teeth; upper stem-leaves lanceolate, pinnatifid, with 

 lanceolate or rarely triangular lobes ; flowers diurnal, their bracts narrowly linear, 

 entire or with a few narrow lobes; capsule 4 cm. long; seeds winged. River 

 valleys: Wash. Mont. Wyo. Utah. Son. Submont. Je-S. 



19. N. parviflora (Dougl.) Greene. Divaricately branched biennial; stem 

 white; lower leaves oblanceolate, coarsely sinuately toothed, with triangular 

 teeth; the upper lanceolate; flowers diurnal; bracts narrowly linear, mostly 

 entire; petals oblanceolate, 2.5-3 cm. long; capsule about 2 cm. long; seeds 

 winged. Bartonia parviflora Dougl. (?) M. Brandegei S. Wats. Along rivers: 

 B.C. Wash. Ore. Son. Submont. Je-Jl. 



3. ACROLASIA Presl. 



Scabrous pubescent annuals. Leaves alternate, rarely some opposite, nar- 

 row, from entire to pinnatifid. Sepals 5, persistent. Petals 5, yellow, rather 

 inconspicuous. Stamens many, free, or nearly so; filaments filiform. Hypan- 



