688 CYPERACEvE cypbeus 



DULICHIUM 



obtuse, 3-4 lines long, many-flowered, densely capitate: scales oblong, pale 

 green, S-nei-ved, coarsely cellular, conduplicate, with a short sharp more or 

 less recurved tip: stamens 1: style 3-cleft: achenes sharply S-angled, gray, 

 oblong, narrowed at each end, almost half as long as the scale. In moist 

 sandy soil, California to Oregon and Illinois. 



Ct escnlentns L. Sp. 45. C. phymatoidea Muhl. Perennial by scaly 

 horizontal tuber-beai'ing rootstoois: stems usually stout^ 6-30 inches high: 

 leaves bright green, as long or longer than the stem, 2-4 lines wide, the 

 midrib prominent; those of the involucre much longer than the inflorescence: 

 umbel 4-10-rayed, often compound: spikelets numerous, in loose spikes, 

 straw-color or yellowish brown, flat, spreading, 6-12 lines long, many-flow- 

 ered: scales ovate -oblong, subacute, 3-nerved: rachis naiTowly winged: 

 stamens 3: style 3-cleft: achenes obovoid, obtuse, 3- angled, In moist sandy 

 fields, Alaska to California and the Atlantic States. 



C. erythrorhizos Muhl. Gram. 20. Stems tufted, stout or slender, 3 

 inches to 2 feet high: leaves 1-4 lines wide, rough-margined, those of the 

 involucre 2-7, some of them often 4 times as long as the inflorescence: umbel 

 mostly compound, several-rayed: spikelets lineai'-subulate, 3-10 lines long, 

 less than a line wide, compressed, many-flowered, clustered in oblong nearly 

 or quite sessile spikes: scales chestnut-brown, oblong-lanceolate, mucronulate, 

 appressed, separating from the rachis at maturity: the membranous wings of 

 the rachis separating as a pair of hyaline interior scales: stamens three: style 

 three-cleft: achenes sharply 3-angled, oblong, pointed at both ends, pale, ^ 

 as long as the scale. In wet soil, Oregon to California and the Eastern 

 States. 



C. Hanghtoui Torr. Ann. Lye. N. Y. iii, 277. Perennial by tuber' 

 like corms: stems sleHd&, erect, 1-2 feet high: leaves shorter than the stem' 

 a line or less wide, smooth; those of the involucre 3-5, the longer much ex" 

 ceeding the inflorescence; umbel simple, 1-5-rayed, the rays mostly sUort> 

 their sheaths 2-toothpd: spikelets loosely capitate, linear, compressed, acute> 

 4-8 lines long, about a line wide, ll-l5-flowered, falling away from the axis 

 when mature: chestnut brown, firm, somewhat spi'eading, shining, oblong, 

 obtuse, truncate or apiculate: rachis very naiTowly winged: stamens 3: style 

 3-cleft: achene broadly oblong, 3-angled, brown, apioulate, nearly as long as 

 the scale. In sandy soil, along the Columbia river to the Bastern States. 



2 DULICHIUM L. C. Richard Pers. Syn. i, 65. (1805.) 



Tall perennial herbs with terete hollow jointed stems, leafy to 

 the top, the lower leaves reduced to sheaths, flat grass-like leaves 

 and perfect flowers in axillary simple or compound spikes. 

 Spikelets flat, linear, many-flowered. Scales 2-ranked, carinate, 

 conduplicate, decurrent on the joint below. Perianth of 6-9 re- 

 trorsely barbed bristles. Stamens 3. Style 2-cleft at the apex, 

 persistent as a beak on the summit of the linear-oblong achene. 



D. spathaceum Pers. Syn. i, 65. Stems stout. 1-3 feet high, erect: 

 leaves numerous, flat, 1-3 inches long, 2-4 lines wide: spikelets shorter than 

 or the uppermost exceeding the leaves: pedicels 2-12 lines long: spikelets 

 narrowly lineai', spreading. 6-12 lines long, about a line wide, 6-12-flowered- 

 scales lanceolate, acuiminate, appressed, brownish: bristles of the perianth 

 stiff, longer than the achene; style loug-exserted. In marshes Oregon to 

 Minnesota and Nova Scotia. 



