82 



SPARGANIACEAE 



3. Sparganium greenei jNIorong. 

 California Bur-reed. Fig. 169. 



Spargaitiion grecnci Morong, Bull. Torrey Club 15: 77. 



1888. 

 Sparqanium eurycarpum greenei Graebner, in Engler 



Pflanzenreich"4": 13. 1900. 



Stem stout, erect, 6-18 dm. high. Leaves 3-15 

 dm. long, 8-12 mm. wide, keeled ; bracts similar 

 but smaller, margins not scarious at base ; in- 

 florescence branched ; the lower branches erect, 

 with usually 2 pistillate and 6-10 staminate heads; 

 fruiting heads 20-25 mm. in diameter ; scales with 

 a cuneate or rhombic blade decidedly broader 

 than the narrow claw ; achenes sessile, brown, 

 shining, obovoid with a rounded summit, 7-9 mm. 

 long, about 5 mm. thick, 3-5-angled ; beak about 

 2 mm. long; stigmas 1 or 2, filiform, about 1 mm. 

 long. 



In marshes of the Pacific Coast region; Transition to 

 Lower Sonoran Zones; Vancouver Island to northern 

 Lower California. Type locality: Olema, Marin County, 

 California. 



4. Sparganium simplex Hu.ds. 

 Simple-stemmed Bur-reed. Fig. 170. 



Spai-ganium simplex Huds. Fl. Aug. ed. 2, 401. 1788. 



Stem rather stout, 4-6 dm. high. Leaves 4-10 

 dm. long, 8-16 mm. wide, triangular-keeled ; bracts 

 flat or slightly keeled ; inflorescence usually sim- 

 ple, the pistillate heads 2-5, at least some of them 

 supra-axillary, the lower 1 or 2 peduncled, the 

 staminate heads 4-8 ; fruiting heads about 15 mm. 

 in diameter ; achenes brown or greenish brown, 

 stipitate, 5-6 mm. long, fusiform, often con- 

 stricted at the middle; stigma linear, about 1 

 mm. long. 



Widely distributed over the cooler regions of the 

 northern hemisphere; British Columbia to Humboldt 

 County, California, mainly in the Canadian Zone. Type 

 locality: Europe. 



5. Sparganium angustifolium Michx. 

 Narrow-leaved Bur-reed. Fig. 171. 



sparganium angnstifolitim Michx. Fl. Bor. Am. 2: 189. 1803. 

 Sparganium simplex angustifolium Torr. FL N. Y. 2: 249. 1843. 

 Sparganium simplex multipedunctilatiim Morong, Bull. Torrey 



Club 15: 79. 1888. 

 Sparganium multipedunculatum Rydb. Bull. Torrey Club 32: 598. 



1905. 



Stem floating and elongated, or erect and 30-50 cm. 

 high. Leaves narrow 4-10 mm. wide, flat not keeled, 

 dilated and scarious-margined at the base; inflorescence 

 usually simple, the pistillate heads 2-4, the lower 1 or 2 

 usually on supra-axillary peduncles, the staminate 

 heads usually approximate; fruit heads 7-10 mm. in di- 

 ameter ; achenes stipitate, about 4 mm. long, fusiform, 

 brown ; stigma linear, about 1 mm. long. 



Margins of slow-running streams and ponds; throughout the 

 cooler regions of North America; ranging from British Columbia 

 to the San Bernardino Mountains, California, mainly in the 

 Canadian Zone. Type locality: Canada. 



