156 rONTRTBUTTONS FROM THE NATIONAL HERBARIUM. 



Range: Washington to Now Brunswick, south to Californ'a and Floi-lila. 

 Specimens examined: West Kl'ckitat County, Suksdorf 223: Ahnota, Piper 2651. 

 2oNAL distribution: Upper Sonoran. 



DULICHIUM. 



1. Dulichium. arundinaceum (L.) Rritton, Bull. Torr. Ciul) 21: 29. 1894. 

 Cyperus aniiiJinaciiis L. 8|). PI. 1: 44. 1753. 

 Schoenus spathaceus L. Sp. PL ed. 2. 1 : 63. 1762. 

 Cyperus spathaceus L. Syst. ed. 12. 2: 735. 1767. 

 Dulichium spathaceum Pers. Syn. 1 : 65. 1805. 

 Type locality: "Habitat in Virginia." 



Range: British Columbia to Nova Scotia, south to Oregon, Texas, and Florida. 

 Specimens examined: Seattle, Piper 692; Lakeview, Fletl, September 20, 1899. 

 Zonal distribution: Humid Transition. 



SCIRPUS. 



Spikelets solitary, terminal. 



Involucral bract present, not longer than the spikelet. 



Perianth bristles none 1 . S. npanus. 



Perianth bristles 6, smooth 2. »S'. cespitosus. 



Involucral bract 2 to 3 times as long as the spikelet 3. <S'. subtermindLis. 



Involucral bract wanting A. S. jmuciforus. 



Spikelets several to many, rarely solitary. 

 Stems terete. 



Inflorescence apparently lateral, sessile 5. S. nevailensis. 



Inflorescence umbellate. 



Akenes 2 mm. long, the scales little longer G. S. validus. 



Akenes 2.5 to 3 mm. long, the .scales one-fourth longer. 7. S. occidenlalis. 

 Stems three-angled. 



Involucral leaf solitary S. S. americanus. 



Involucral leaves several. 



Spikelets 1 to 2 cm. long. 



Akenes oblong-obovate, pale 9. S". Irittonianus. 



Akenes orbicular-obovate, dark 10. iS. rohustus. 



Spikelets 3 to 5 mm. long. 



Akenes 3-angled; bristles 6 11. S. atrovirens. 



Akenes plano-convex ; bristles 4 12. S. ir.icrocarpus. 



1. Scirpus riparius (R. Br.) Spreng. Syst. 1:208. 1825. 

 Isolepis riparia R. Br. Prod. Fl. Nov. Hoi. 222. 1810. 

 Type locality: Port Jackson, Australia. 



Range: Washington to California. South America. Australia. Africa. 

 Specimens examined: Whidby Island, G^art^nf?" 318; Seattle, Pi^w 2860. 

 Zonal distribution: Humid Transition. 



2. Scirpus cespitosus L. Sp. PI. 1: 48. 1753. 

 Type locality: Europe. 



Range: Alaska to Greenland, south to Washington, Colorado, and New York. 



Specimens examined: Olympic Mountains, Piper 2248; Skamania County, Sulsdorf 

 2241; Cascade Mountains, 49°, Lyo// in 1860; Stevens Fuss, Sandbery d- Leiberg 77 5; Bridge 

 Creek, Elmer 644; Granville, Conard 376. 



Zonal distribution: Arctic. 



