304 CONTEIBUTIONS FROM THE NATIONAL HEEBAEIUM. 



50. Carex viridula Michx. On the rocky beach of Lake St. Mary at Sun Camp. 

 Newf. to southeastern Alaska, south to N. J., Colo., and northern Calif. — Culms 7 to 

 40 cm. high; leaf blades 1.5 to 3 mm. wide; staminate spike sessile or nearly so; 

 pistillate spikes 2 to 10, aggregate or the lower separate; scales much shorter than the 

 perigynia, the latter wliite-tipped. 



51. Carex flava L. Common at low and middle altitudes, on lake shores or stream 

 banks or in bogs. Newf. to southeastern Alaska, south to N. J., Ohio, Mont., and 

 B. C. — Culms 15 to 60 cm. high; leaf blades 2 to 5 mm. wide; yellowish green; 

 staminate spike sessile or stalked; pistillate spikes 1 to 4, the lower separate; scales 

 strongly reddish-tinged; perigynia reddish-tipped. 



52. Carex miliaris Michx. Common at low and middle altitudes, in bogs or low 

 thickets and meadows, or along streams; sometimes in meadows above timber line. 

 Lab. to B. C, south to Me. and Mont. — Rootstocks creeping; culms 30 to 60 cm. 

 tall, smooth; leaf blades 2 mm. wide; staminate spikes 1 or 2; pistillate spikes 1 to 3, 

 oblong-cylindric; perigynia faintly nerved, scarcely inflated, 2 to 3 mm. long, 

 exceeding the scales, the beak entire or nearly so. 



63. Carex vesicaria L. Common at low and middle altitudes, in bogs or low 

 thickets, or on brushy hillsides. Que. to B. C, south to Pa., Ohio, and Calif. — 

 Culms 30 to 90 cm. high; leaf blades 3 to 6 mm. wide; staminate spikes 2 to 4, 

 pistillate spikes 1 to 3, oblong-cylindric, 2.5 to 7 cm. long; scales sharp-pointed; 

 perigynia 5 to 8 mm. long, yellowish green. 



54. Carex rostrata Stokes. Common at low and middle altitudes, in low thickets, 

 wet meadows, marshes, or sphagnum bogs. Lab. to northern Alaska, south to Del., 

 N. Mex., and Calif. — Culms stout, 30 to 120 cm. high; leaf blades 2 to 12 mm. wide; 

 staminate spikes 2 to 4; pistillate spikes 2 to 4, cylindric, 5 to 15 cm. long; scales 

 sharp-pointed; perigynia ovoid, yellowish, 4 to 8 mm. long. 



Very abundant in some localities. Near the east entrance there are extensive 

 meadows which are cut for hay that are covered almost exclusively with this sedge. 

 The plants are large and coarse, and often form great tufts in bogs. 



15. ARACEAE. Arum Family. 

 1. LYSICHITON Schott. 



1. Lysichiton kamtschatcensis Schott. Western skunkcabbage. In de^p 

 swamps at low altitudes on the west slope; flowering in spring. Alaska to Calif, 

 and Mont.; also in eastern Asia. — Plants glabrous, succulent; leaves elHptic to 

 lance-oblong, 30 to 50 cm. long, acute; flowers small, in a dense clublike spike, 

 this surrounded by a large lemon-yellow corolla-like spathe. 



The eastern skunkcabbage {Spathyema foetidum) belongs to this family. False 

 hellebore (species of Veratrum) is sometimes known as skunkcabbage in the West. 



16. lEMNACEAE. Duckweed Family. 



1. LEMNA L. Duckweed. 



Plants floating on water, consisting of a thallus-like frond, without leaves, each 

 frond with a slender rootlet; flowers minute, borne on the upper side of the frond. 



Frond oblong, 5 to 10 mm. long 1. L. trisulca. 



Frond oval or rounded, 2 to 3 mm. long 2. L. minor. 



1. Lemna trisulca L. Collected in ponds at east entrance by Umbach. Widely 

 distributed in N. Amer., Eur., Asia, and Australia. — Plants bright green, submerged 

 or floating, several plants usually attached to each other. 



2. Lemna minor L. Collected in ponds at east entrance by Umbach. Widely 

 distributed in N. Amer., Eur., Asia, and Australia. — Fronds floating, solitary or a 

 few together. 



