20. Juncus Marginatus Rostk. Grass-Leaved Rush

Fig. 1185

Juncus marginatus Rostk. Monog. June. 38. pl. 2. f. 3. 1801. Juncus marginatus var. paucicapitatus Engelm. Trans. St. Louis Acad. 2: 455. 1866.

Stems erect, tufted, 6'-3o' high from branching root-stocks, somewhat bulbous at the base, compressed, 2-4-leaved. Leaf-sheaths auriculate; blades 1/2"-1 1/2" broad, 2-4 conspicuous veins in addition to the midrib; inflorescence 4' high or less, the panicle composed of 2-20 turbinate to subspherical 5-10-flowered heads; perianth 1 1/4"-1 3/4" long, the outer parts ovate, acute, the inner slightly longer, obovate, obtuse, with hyaline margins; stamens 3, nearly as long as the perianth; anthers ovate, reddish brown when dry, much shorter than the filaments; capsule equalling the perianth, obo-void, truncate or retuse, almost 3-celled, the placentae deeply intruded; seed oblong, 1/5"-1/4" long, pointed at either end, 12-16-ribbed.

Grassy places, Maine to Ontario, Florida and Nebraska.

21. Juncus Aristulatus Michx. Large Grass-Leaved Rush

Fig. 1186

J. aristulatus Michx. Fl. Bor. Am. 1: 192. 1803. J. marginatus bijlorus Wood, Class-book, Ed. 2, 725.

1861. J. marginatus aristulatus Coville, Proc. Biol. Soc.

Wash. 8: 123. 1893.

Plants solitary or sparingly tufted, 10'-3° high or sometimes lower. Stems markedly bulbous-thickened at the base; leaves similar to those of j. marginatus, but sometimes 2 1/2" broad; panicle 6' high or less, composed of numerous, usually 20-100, relatively small, 2-5-flowered heads; perianth about 1 1/4" long; sepals acute or acuminate; petals oblong or obovate, obtuse, longer than the sepals; stamens as long as the perianth or longer; anthers much shorter than the filaments; capsules obovoid, about 1" long, truncate or depressed at the apex.

In moist soil or meadows, Massachusetts to Michigan, Florida, Texas and Mexico.

22. Juncus Setosus (Coville) Small. Awn-Petaled Rush

Fig. 1187

j. marginatus setosus Coville, Proc. Biol. Soc.

Wash. 8: 124. 1893. Juncus setosus Small, Fl. SE. U. S. 258. 1903.

Plants rather loosely tufted, 1°-2 1/2° high, bright green. Stems not much thickened at the base; leaves with auriculate sheaths, sometimes quite numerous; blades 1"-2 1/2" wide, similar to those of j. marginatus; panicle 1'-4' high, composed of 20-100 heads, or smaller in depauperate forms; perianth 1 1/2"-2" long, the outer parts lanceolate-acuminate, the inner slightly larger than the outer, lanceolate to ovate-lanceolate, setiform-acuminate; stamens 3, much shorter than the perianth; anthers and filaments about equal in length, the former reddish-brown; capsules oblong, about as long as the perianth, blunt.

In woods and wet places, Nebraska to Louisiana, Arizona and Mexico.