314 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



14. TRILLIUM L. 



1. Trillium ovatum Pursh. Wake-robin. Frequent on the west slope at low and 

 middle altitudes, in moist woods, or in swamps. B. C. to Calif., Colo,, and Mont. — 

 Plants 20 to 40 cm. high, glabrous, with rootstocks; leaves broadly ovate, 7 to 12 cm. 

 long, sharp-pointed; flower long-stalked, the 3 petals pink or white, turning purplish; 

 fruit a juicy berry. 



In late summer the leaves turn pale and wither. 



15. FRITILLARIA L. 



1. Fritillaria pudica (Pursh) Spreng. Yellow-bell. East entrance, Mrs. Olio 

 Thompson. B. C. to Calif., Utah, and Mont. {Ochrocodon pudicus Rydb.). — Plants 

 glabrous, 10 to 30 cm. high, from scaly buds; leaves 3 to 10 cm. long, blunt; flowers 

 12 to 20 mm. long; capsule 3 to 4 cm. long. 



The plant flowers in spring. 



19. IRIDACEAE. Iris Family. 



Perennial herbs with rootstocks; leaves narrow, their edges turned toward the 

 stem; sepals and petals each 3, colored; stamens 3; fruit a capsule. 



Flowers 10 to 12 mm. long, the sepals and petals alike; leaves 1 to 3 mm. wide. 



1. SISYRINCHIUM. 

 Flowers 6 to 8 cm. long, the sepals and petals very unlike; leaves 5 to 10 mm. wide. 



2. IRIS. 

 1. SISYRINCHIUM L. 



1. Sisyrinchium mucronatum Michx. Blue-eyed grass. A few plants found 

 near a snow bank on Altyn Peak, and in a wet meadow below Lake McDermott. 

 Alta. and Mont, to Md. and Ont. — Plants grasslike, 10 to 30 cm. high, glabrous, the 

 stem leafy, narrowly winged; flowers few, purplish blue; capsule globose. 



2. IRIS L. 



1. Iris missouriensis Nutt. Blue flag. Among aspens and in low places on 

 the prairie near the east entrance. B. C. to Calif., N. Mex., and N. Dak. — Plants 

 glabrous, 20 to 40 cm. high; leaves 10 to 40 cm. long, sharp-pointed, sword -shap ed ; 

 flowers few, pale blue, the sepals recurved, the petals erect; capsule about 4 cm. 

 long, 6-ridged. 



A very handsome plant which, unfortunately, probably does not grow within the 

 limits of the park. 



20. ORCHIDACEAE. Orchis Family. 



Perennial herbs, more or less succulent; leaves entire; flowers solitary or in spikes 

 or racemes, very irregular; sepals 3; petals 3, the 2 lateral ones alike, the middle 

 one (lip) usually very different, sometimes with a long or short spur at the base; 

 stamens 3, but 1 or 2 of them abortive; fruit a capsule, containing very numerous 

 small seeds. — All of our species gi'ow upon the ground. 

 Plants without any green coloring; leaves all reduced to bracts. 



1. CORALLORHIZA. 

 Plants green; leaves present. 



Leaves 2, opposite at about the middle of the stem 2. OPHRYS. 



Leaves 1 to many, some or all of them at the base of the stem, the stem leaves 

 alternate. 

 Lip petal 15 to 20 mm. long. 



Leaf 1, at the base of the stem 3. CYTHEREA. 



Leaves nunaerous, scattered along the stem 4. SERAPIAS.. 



