IRIS FAMILY 175 



4. S. idahoense Bickn. Stem 2-4.5 dm. high, pale green and glaucous, 

 often twisted, 1-3 mm. wide, winged; leaves 1-3.5 mm. broad; spathe often de- 

 flexed, green or faintly purple; outer bract 3-6 cm. long, a little longer than the 

 inner, both with narrow hyaline margins; perianth deep violet-blue, with a rather 

 small yellow eye, abruptly cuspidate; capsule globose or ovoid. Wet meadows' 

 Mont. Wyo. Ore. B.C. Submont. My-Jl. 



5. S. heterocarpum Bickn. Stem erect, 2-3 dm. high, 1-1.5 mm. wide, 

 narrowly winged; leaves 1-2 mm. wide, attenuate; spathe sometimes purple- 

 tinged, narrow, 1-3 mm. wide; outer bract 2.5-4.5 cm. long, with hyaline margins 

 below; inner bract 1.5-2 cm. long, hyaline-margined to the apex; perianth 

 violet-purple, about 1 cm. long, with a large yellow eye; fruit of the terminal 

 spathe 1-4, subglobose or somewhat obovoid, 5-7 mm. high; basal capsules 

 among the leaves, 2-4, obovoid-pyriform, 7-10 mm. long, 4-5 mm. thick, with a 

 narrow base, on slender pedicels 2.5-3.5 cm. long. Moist meadows and sandy 

 ground: Wyo. Jl-Au. 



6. S. alpestre Bickn. Stem 1-2 dm. high, green and glaucous, 1-1.5 mm. 

 wide, narrowly winged, distinctly broadened into the spathe; leaves 1-2 mm. 

 wide; spathe green; outer bract long and slender, 4.5-6.5 cm. long, with narrow 

 hyaline margins; inner bract 1.8-3 cm. long; perianth 6-10 mm. long; segments 

 white or tinged with purple. Alpine meadows: Colo. Mont. Au. 



7. S. septentrionale Bickn. Stem 1-2.5 dm. high, slender, 0.5-1 mm. 

 wide, barely margined; leaves 0.5-1 mm. broad; spathe purplish or green; outer 

 bract 2.5-4 cm. long, the inner 1.5-2 cm. long, both hyaline-margined; perianth 

 4-7 mm. long, pale rose or violet. Wet meadows: Man. N.D. Wash. 

 B.C. Plain. Je-Jl. 



8. S. angustifolium Miller. Stem stiff, glaucous, 1-5.5 dm. high, simple 

 or rarely branched, 1-3 mm. wide, winged; leaves 1-3.5 mm. wide; spathe green 

 or slightly purplish; outer bract 2-6.5 cm. long, obscurely hyaline-margined; 

 inner bract 1.5-3 cm. long, hyaline-margined; flowers deep violet, 10-12 mm. 

 long: capsule ellipsoid to subglobose. S. montanum Greene. Meadows: Newf. 

 Va. Colo. B.C. Plain Mont. Je-Au. 



9. S. mucronatum Michx. Stems numerous, 1-4.5 dm. high, 0.5-1.5 mm. 

 wide, margined or narrowly winged; leaves dull green, slender, 1-1.5 mm., 

 rarely 2 mm. wide; spathe usually red-purple, rarely green; outer bract 1.8-5.5 

 cm. long; inner bract 1-1.5 cm. long, scarious-margined; perianth deep purplish 

 blue, rarely white, 6-14 mm. long; capsules subglobose. Wet places: Ont. 

 D.C. Pa. Alta. Plain. My-Jl. 



10. S. campestre Bickn. Stem usually 1.5-2 dm. high, erect, stiff, glaucous, 

 0.5-1.5 mm. wide, narrowly winged; leaves 1-1.5 mm., rarely 2 mm. wide; spathe 



n!e purple or green; outer bract 2.5-4.5 cm. long, narrowly hyaline-margined 

 ow; inner bract 1.2-2 cm. long, white-hyaline on the margins; perianth 8-14 

 mm. long, pale blue or white; capsule trigonous-subglobose. Prairies: Wis. 

 Mo. La. N.M. N.D. Plain. 



11. S. inalatum A. Nels. Stem simple, 3-4 dm. high, wingless, 10-striate; 

 leaves 9-15-nerved, 4-8 mm. broad, often somewhat arcuate; outer spathe 4-6 

 cm. long, many-nerved, scarious-margined; inner spathe 6-8-nerved, less than 

 half as long; capsule 5-6 mm. long, obovoid-globose. Dry open hillsides: Ida. 

 Submont. Je. 



2. OLSYNIUM Raf. 



Perennial grass-like herbs, usually tufted. Leaves narrowly linear, equi- 

 tant. Scape flattened but not winged. Flowers in terminal clusters, subtended 

 by a spathe of 2 bracts. Petals and sepals rose or purple, spreading, similar. 

 Filaments united only at the broad bases. Styles cleft at the apex. Capsule 

 globose. 



1. O. grandiflorum (Dougl.) Raf. Stem erect, stout, 2-3 dm. high, 2-3 

 mm. thick; outer bract 5-10 cm. long, broadly scarious-margined; inner bract 

 scarcely half as long; corolla 15-20 mm. long; segments slightly cuspidate, obo- 



