300 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



7. Carex sartwellii Dewey. Frequent in wet open places about the east entrance. 

 N. Y. to Mont., south to 111. and Colo. — Culms 40 to 70 cm. high, rough above; leaf 

 blades 2.5 to 4 mm. wide; spikes densely aggregate in an oblong head; perigynia 2.5 

 to 4 mm. long, very short-beaked. 



8. Carex hoodii Boott. On shaded cliffs near Many Glacier Hotel; in deep damp 

 woods at Sun Camp. Alta. to B. C, south to Colo, and Calif. — Densely cespitose; 

 culms 30 to 60 cm. high; leaf blades 1.5 to 3.5 mm. wide; head 1 to 2 cm. long; 

 perigynia ascending, serrulate to middle, 4 to 5 mm. long, margined above, sharply 

 bidentate. 



9. Carex diandra Schrank. Common in sphagnum bog at Johns Lake. N. S. to 

 Alaska, south to Pa., Colo., and in the mountains to southern Calif. ; also in Eurasia. — • 

 Culms loosely cespitose, slender, 30 to 70 cm. high; leaf blades 1 to 2.5 mm. wide; 

 head 2.5 to 5 cm. long, not interrupted, compound; perigynia not concealed by scales, 

 coriaceous, conspicuously rough-beaked. 



10. Carex laeviculmis Meinshaus. In a low thicket along Snyder Creek. Alaska 

 to Mont., south to Calif.; also in Siberia. — Culms 30 to 70 cm. high, weak; leaf blades 

 1.5 to 2 mm. wide, flat, soft; spikes 3 to 8, with 3 to 10 perigynia; scales with sharply 

 defined green midvein; perigynia 2.5 to 3 mm. long, the beak slightly bidentate. 



11. Carex interior Bailey. Marsh near Swiftcurrent Creek below Lake McDermott. 

 Me. to B. C, south to Pa., Ind., nortliem Mex., and Calif. — Culms 20 to 40 cm. high, 

 stiff, slender, mry; leaf blades 1 to 2 mm. wide; spikes 2 to 4, approximate; scales 

 very obtuse, with light center; perigynia ovoid, 2.5 mm. long, abruptly short-beaked, 



he teeth short. 



12. Carex leptopoda Mackenz. Common in deep woods and on lake shores at 

 middle altitudes; sometimes on open slopes, and occasionally found above timber 

 line. B. C. to Mont, and Calif. — Rootstocks slender, elongate; culms slender, 30 to 

 75 cm. high; leaf blades 2.5 to 5 mm. wide; spikes 4 to 7, narrow, approximate; 

 scales short; perigynia 3.5 to 4.5 mm. long, substipitate, the beak shallowly bidentate. 



13. Carex athrostachya Olney. Swales near east entrance, Umhach. Sask. to 

 Yukon, south to Colo, and Calif. — Culms 5 to 30 cm. high; leaf blades 1.5 to 2.5 mm, 

 wide; spikes 4 to 15, densely aggregate; perigynia exceeding scales, lanceolate-ovate. 

 3 to 4 mm. long, slenderly beaked, hyaline at orifice. 



14. Carex aenea Fernald. Low thicket along Swiftcurrent Creek below Lake 

 McDermott. Lab. to Yukon, south to Conn., Mont., and B. C— Culms 40 to 90 

 cm. high; leaf blades 2.5 to 4 mm. wide; spikes 3 to 12 in a flexuous head; scales 

 light brownish, hyaline-margined; perigynia ascending, ovate, 4 mm. long. 



15. Carex bebbii Olney. On sandbar along Lake McDonald near Lewis's. Newf. 

 to B. C, south to N. J. and Mont. — Culms 20 to 80 cm. high, rough beneath head; 

 leaf blades 2 to 4.5 mm. wide; spikes 5 to 10, closely aggregate; perigynia brownish, 

 ascending, ovate, 3 to 4 mm. long. 



16. Carex phaeocephala Piper. Frequent on open rocky slopes at middle and 

 high altitudes. Alta. to southeastern Alaska, south to Colo, and Calif. — Leaf blades 

 1.5 to 2 mm. wide, more or less involute; spikes 2 to 5 (7), aggregate; scales reddish 

 brown, strongly hyaline-margined; perigynia ascending, oblong-ovate, obscurely 

 nerved ventrally, short-beaked. 



17. Carex praticola Rydb. In dense moist woods along Swiftcurrent Creek below 

 Lake McDermott; in low aspen thickets about the east entrance. Greenl. to Alaska, 

 south to Me., Colo., and northern Calif. — Culms 25 to 60 cm. high; leaf blades 1 to 2 

 mm. wide; spikes 2 to 6; scales shining; perigynia appressed, ovate-lanceolate, 

 4.5 to 6.5 mm. long, nerveless ventrally, short-beaked. 



18. Carex piperi Mackenz. Fields near east entrance, Umhach. B. C. to Alta., 

 south to Wyo. and Oreg. — Culms 30 to 80 cm. high; leaf blades 2 to 3.5 mm. wide, 



