1904] Chase, — Allies of Scirpus lacustris 69 



occidejitalis. In the Gray Herbarium are the following marked " S. 

 lacustris^ var. occidentalis''^ in Dr. Watson's handwriting: Nevada, 

 mouth of Run [?] River, alt. 5000 ft., July 1868 — immature {^Watson 

 1212, King Exped.): British Columbia, Saturna Island, 1858 — 

 immature {Lyall, Oregon Boundary Comm.) : California, Yosemite 

 Valley, 1866 — nearly mature {Bolander 6231, Geo!. Surv. Cal.); 

 Santa Barbara, 1875 — very immature {Rothrock 57, Wheeler 

 Exped.): New Mexico, 1873 — immature (Z^^«/, Wlieeler Exped.); 

 1851-52, — immature {Wright 1940). In the National Herbarium 

 is one specimen marked var. occidentalis by Dr. Watson : Nevada, 

 Humboldt Pass, alt. 6000 ft., Sept., 1868 — fully mature ( Watson 

 1212). 



The discrepancy in the data of these two specimens of Watson 

 1212 is probably due to giving the same number to all collections of 

 one species during the expedition. 



Specimens examined. — Those cited above: Newfoundland 

 {Waghorfie — very immature, but scales large and viscid): Maine, 

 Mattawamkeag Lake {Fernald) ; Ship Pond, Elliottsville {Ferna/d 

 419); Chemo Pond, Bradley {Briggs); Monhegan Island {F. G. 

 Smith) ; Rangeley Lakes {Furbish) : New Hampshire, Dixville 

 Notch {Boott) : Massachusetts, Revere ( Young) ; Fresh Pond, 

 Cambridge {Boott): New York, shore of Lake Ontario {Wibbe): 

 Ontario, Sarnia (Macoun 34,582) : Ohio, Licking Co. {Jones): 

 Indiana, Lake Michigan basin {HiJI, Lansing 962, A. Chase 2,\^)\ 

 Illinois, South Chicago {A. Chase 1628) : Romeo, Desplaines val- 

 ley just beyond Lake Michigan watershed {Umhach) : Wisconsin, 

 Lake Michigan basin {R. Bebb) : Missouri, Courtney {Bush 23): 

 Nebraska, Middle Loup River, Thomas Co. {Rydberg 1388 in part): 

 Montana, Madison River {Rydberg 2277) ; Madison River {Shear 

 521); Snake River {A. tS- E. Nelson 6571) : Wyoming, Little Mis- 

 souri Buttes {Griffiths 593): Colorado, Canon City {Brandegee)\ 

 Utah {Bis hof>): New Mkxico { Vasey) : Arizona {Rothrock 2>Zoa); 

 Santa Cruz {Pringle) ; ( Vasey) ; vicinity of Flagstaff {MacDougai 

 275) : British Columbia {Lyatl) : Washington, Cascade Mts. 

 {Tiveedy 2)\ Falcon Valley {Suksdorf d>c^) \ Lake Chelan {Gorman 

 697); Okanogan Co. {Elmer 539); {Vasey 11): Oregon {E. Ball 

 562); Wasco Co. {Leiberg 865); California, San Bernardino Val- 

 ley {Parish 956); Walkers Basin {Rothrock 280); Tulare Co. {Coville 

 6- Funston 1736); Placer Co, {Vase}'). 



Scirpus occidentalis is distinguished from .S". validus by achene J 

 larger, by scales J-J longer than the achene and nearly twice as long 

 as scales of S. validus, viscid-pubescent, overlapping \ their length 

 or more; by the cylindric, more densely fruited spikelets in capitate 

 clusters ; and by the denser umbels and harder culms. From .S'. 

 lacustris L. it is distinguished by the 2-cleft style, lenticular achene, 

 viscid-pubescent scales, cylindric, densely fruited spikelets, and by 

 the terete or obscurely 3-sided involucral bract. 



