4. Rynchospora Alba (L.) Vahl. White Beaked-Rush

Fig. 844

Schoeuus albus L. Sp. PI. 44. 1753. Rynchospora alba Vahl, Enum. 2: 236. 1806. Rynchospora alba macra Clarke; Britton, Trans. N. Y. Acad. Sci. 11: 88. 1892.

Pale green, rootstocks short, culms slender or almost filiform, glabrous, 6'-20' tall. Leaves bristlelike, 1/4"-1/2" wide, shorter than the culm, the lower very short; spikelets several or numerous, in 1-4 dense corymbose terminal and axillary clusters, narrowly oblong, acute at both ends, 2"-3' long; scales ovate or ovate-lanceolate, white, acute; bristles 9-15, downwardly barbed, slender, about as long as the achene and tubercle; style 2-cleft; achene obovate-oblong, smooth, pale brown, lenticular; tubercle triangular-subulate, flat, one-half as long as the achene.

In bogs, Newfoundland to Alaska, south to Florida, Kentucky, Minnesota, Idaho and California. Also in northern Europe and Asia. June-Aug.

4 Rynchospora Alba L Vahl White Beaked Rush 844

5. Rynchospora Capillacea Torr. Capillary Beaked-Rush

Fig. 845

Rhynchospora capillacea Torr. Comp. 41. 1826. Rynchospora capillacea laeviseta E. J. Hill, Am. Nat. 10: 370. 1876.

Culms filiform, tufted, glabrous, 6'-20' tall. Leaves filiform, less than 1/4" wide, much shorter than the culm, the lower very short; spikelets few, in 1-3 terminal and axillary loose clusters, oblong, acute at both ends, 2"-3' long; scales ovate-oblong, chestnut-brown, keeled, mucronate; bristles 6, or sometimes 12, slender, downwardly barbed, or sometimes smooth, about equalling or becoming longer than the achene and tubercle; achene narrowly oblong, short-stalked, light brown, minutely wrinkled, lenticular; style 2-cleft; tubercle compressed, triangular-subulate, dark brown, about one-half as long as the achene.

In bogs, New Brunswick to Ontario, Minnesota, New Jersey, Pennsylvania, Indiana and Missouri. July-Aug.

5 Rynchospora Capillacea Torr Capillary Beaked Rus 845

6. Rynchospora Knieskernii Carey. Knies-Kern's Beaked-Rush

Fig. 846

R. Knieskernii Carey, Am. Journ. Sci. (II.) 4: 25. 1847.

Culms slender, tufted, smooth, 8'-18' tall. Leaves narrowly linear, flat, about 1/2" wide, much shorter than the culm; spikelets numerous, in several distant compact clusters, oblong, acute, about 1" long; scales chestnut-brown, ovate; bristles 6, downwardly barbed, equalling the achene; achene obovate, lenticular, brown, minutely wrinkled; style 2-cleft; tubercle triangular-subulate, pale, one-half as long as the achene or less and slightly decurrent on its edges.

Pine barrens, New Jersey to Virginia. July-Aug.

6 Rynchospora Knieskernii Carey Knies Kern s Beake 8466 Rynchospora Knieskernii Carey Knies Kern s Beake 847

7. Rynchospora Glomerata (L.) Vahl. Clustered Beaked-Rush

Fig. 847

Schoenus glomeratus L. Sp. PI. 44. 1753. Rynchospora glomerata Vahl, Enum. 2: 234. 1806.

Rootstocks slender, culms smooth, triangular, slender or rather stout, 1/2°-4 1/2° high. Leaves flat, '-2" wide, rough-margined, shorter than the culm; spikelets several or numerous, in 2-7 corymbose-capitate axillary rather loose clusters, oblong, narrowed at both ends, 1 1/2"-2" long; scales lanceolate, rich dark brown; bristles 6, downwardly barbed, rarely smooth, longer than or equalling the achene and tubercle; achene obovate, lenticular, smooth, dark brown; tubercle subulate, about as long as the achene.

In moist soil, New Brunswick to Ontario, Michigan, Arkansas, Florida and Texas. Consists of numerous races, differing in size, in width of leaves and in development of the inflorescence. July-Sept. False Bog-rush.