Kriophorum. CYPERACE^. 219 



unequal, one much the longer and more erect : spikelets ovate to oblong-ovate, acute, 

 6 to 10 lines long : scales ovate, 2 or 3 lines long, dull brown, emarginate, tipped 

 with a long slender soon recurved awn : bristles 1 to 6, unequal, deciduous, or some- 

 times none : lilaments elongated ; anthers 2 lines long : style mostly 3-cleft : nutlet 

 broadly obovate, plano-convex or slightly angled on the back, obtuse and only 

 slightly apiculate, \\ lines long. — Keicheidj. 1. c, t. 310, 311 ; Benth. Fl. Austr. 

 vi. 335. *S'. robnstus, Presl, 1. c. 194. 



In saline Incalitit-s tbrongliout tlio Stato and noitliwanl to British Columbia, as well as cast- 

 wanl a(!ioss tlui continent. Tlio sj>('(;ics is I'ound under several lornis in most of the tenqicrate and 

 tn)i)ical ref^ions of tlio gioho. 



-»- -t- Spikelets small, numerous, tjreenish or lead-colored, in a comiiound or de- 

 compound umbellate panicle. 



9. S. sylvatiCUS, Linn. Stem stout, 2 to 5 feet high, obtu.sely triangular, leafy 

 to the t(q) : leaves broad (usually half an inch wide), elongated; involucre of simi- 

 lar bracts : panicle deconq)ound, large and open, the spikelets in clusters terminating 

 the branches and in the axils, H to 2 lines long, oblong-ovate: scales ovate-lanceo- 

 late, obtuse or st)nietimes acute : bristles barbed to the base, about e(iualliiig the 

 small {\ line long) pale nutlet, which is obovate, j)lano-convex, slightly angled on 

 the back, abruptly short-beaked: styles 3-cleft. — lieichenb. 1. c, t. 313. 



Var. digynus, Boeck. Style bilid and the nutlet not at all angled on the back : 

 stamens 2 and bristles 4. — Linufea, xxxvi. 727. -S". microcarjms, Presl, 1. c. 195; 

 Gray, Manual, 5G4. S. lenticidaris, Torr. Cyp. 328. 



Only the variety has been collected in California, where it is rather frequent, ranging from San 

 Diego County (Cuiainaca Mountains, Pdlmrr) to British Columbia, and across the continent north- 

 ward. The typical Eurojican form is collected rarely in New England. 



10. S. atrovirens, Muhl. Very similar to the last: panicle more contracted, 

 the smaller spikelets (li lines long) crowded in denser and larger clusters : scales 

 narrower and narrowly acuminate : bristles scarcely barbed below the middle : style 

 3-cleft : mitlet oblong-obovate, more acuminate, slightly angled on the back. — .V. 

 st/lvaticus, var, atrovirens, Boeck. 1. c. 



Plumas County {Mrs. Austin); Oregon (Howell); Colorado, and eastward from the Saskatche- 

 wan and Indian Territory to New Englaiul. 



§ 3. Bristles elonqated, the barbs directed upward: stem leafij, bearing a sessile 

 head of spikelets subtended by a few involucral scales. 



11. S. criniger, Gray. Stems slender, 3 inches to 2 feet high or more, from 

 densely matted rootstocks, triangular and striate, rough above : leaves flat, rough on 

 the margins, the radical one elongated but shorter than the stem, the cauline only 

 an inch or two long, distant, the uppermost usually very near the top : in-volucral 

 bracts broad and scale-like, acuminate, 2 to 4 lines long : spikelets 5 to 9, oblong, 3 

 or 4 lines long; scales tliin and .soft, brownish, oblong: lilaments very slender, 

 much exserted and exceeding the six bristles : style 3-cleft : nutlet oblong, triangu- 

 lar, acute and shortly beaked, a line long. — Proc. Amer. Acad. vii. 392. 



In the Sierra Nevada ; Wood's Peak, above Amador Pass near snow (Brcircr); Plumas County 

 (.Vrs. Austin) ; Modoc County (iVm S. A. Plummer) — also in the Red Mountains of Mendocino 

 County, Bolander. The bristles are not naked and silky sus is the case in § Triclwphorum. 



3. ERIOPHORUM, Linn. Cotton-Guass. 

 Bristles usually very numerous, naked, silky, becoming greatly elongated. Other- 

 wise as Scirpus. — Spikelets single or clustered or umbellate, usually involucrate 

 Avith erect scale-like bracts, upon a leafy or naked stem ; scales membranaceous, 

 1 - 3-nerved. Style very slender and elongated, 3-cleft, Nutlet acutely triangular. 

 Perennials with creeping rootstocks. 



