148 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO THE SPECIES. 
Outer bracts of the inflorescence about twice as long as the inner... . 1. S. campestre, 
Outer bracts of about the same length as the inner. 
Perianth 7 to 10 mm. loag; plants somewhat glaucous, the stems 
clustered; bracts broad, 10 to 20 mm. long; stems flexuous, 
often ascending..........-...---.....2200220222--2----. 2. 8. demissum. 
Perianth 10 to 14 mm. long; plants more slender, bright green, 
the stems mostly solitary, erect, straight; bracts 16 to 32 
mm. long............. 22-222 eee eee eee eee ee eee eee 3. S. occidentale. 
1. Sisyrinchium campestre Bicknell, Bull. Torrey Club 26: 341. 1899. 
Type Locauity: “ Wisconsin to North Dakota, south to Louisiana, Oklahoma and 
the mountains of New Mexico.’’ 
Rance: As under type locality. 
New Mexico: Chama; Santa Fe and Las Vegas mountains; Sierra Grande; Sacra- 
mento Mountains. Transition Zone. 
2. Sisyrinchium demissum Greene, Pittonia 2: 69. 1890. 
Tyre LocaLity: “In moist meadows at the base of Bill Williams Mountain 
Arizona, and also near Flagstaff.’ 
RanGeE: Arizona to western Kansas. 
New Mexico: Las Vegas; mountains west of Grants Station; Zuni; Barranca; Mogo- 
Hon Mountains; Black Range; Chavez; Socorro; White Mountains. Meadows, in the 
Transition Zone. 
3. Sisyrinchium occidentale Bicknell, Bull. Torrey Club 26: 447. 1899. 
Type Locauity: “Idaho and Nevada to Colorado and North Dakota.’’ 
RANGE: As under type locality. 
New Mexico: Near Pecos; Iron Creek, Mogollon Mountains; north of El Vado. 
Upper Sonoran Zone. 
3. IRIS L. Buve ruag. 
Plants 30 to 70 cm. high, with long, flat, somewhat glaucous leaves arising from a 
thickened rootstock; flowers large, very showy, sweet-scented, pale blue. 
1. Iris missouriensis Nutt. Journ. Acad. Phila. 7: 58. 1834. 
Typr Locauity: “Towards the sources of the Missouri.”’ 
RanGE: British America south to California, Arizona, and New Mexico. 
New Mexico: Santa Fe and Las Vegas mountains; Sandia Mountains; Tunitcha 
Mountains; Chama; Sierra Grande; Manguitas Spring; Black Range; White and 
Sacramento mountains. Meadows, in the Transition and Canadian zones. 
Order 15. ORCHIDALES. 
28. ORCHIDACEAE. Orchis Family. 
Herbaceous plants, perennial by bulbs or thickened roots, sometimes parasitic; 
leaves entire, from mere sheathing bracts to broadly ovate; flowers sometimes con- 
spicuous, in ours usually small, of bizarre forms especially adapted to insect pollina- 
tion; corolla of two similar lateral petals and a third (the lip or labellum) very different 
one, this frequently spurred or saccate; stamens gynandrous, with usually only one 
anther; pollen in small coherent masses (pollinia); ovary inferior; fruit a capsule. 
