IO SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 
Los Angeles; Davidson. Pasadena; McClatchie. San Jacinto 
Mts.; 2286 Hall, Parish. San Bernardino; Parish. Through- 
out North America, from Nova Scotia and Manitoba to Colo- 
rado and California. 
S. atrovirens, Muhl. is reported in Abram’s Flora of Los 
Angeles on collections by Davidson. But the specimens in 
Davidson’s herbarium are not of this species, which is not to 
be expected in our region. It may be recognized by its larger 
and darker spikelets, 3-parted styles, and 3-angeled achenes. 
+ + Culms terete, sheathed at base; principal involucral leaf 
stiff and pungent, apparently continuous with the culm; stamens 3. 
++ Secondary involucral leaf scale-like, inconspicuous, cr want- 
ing, bristles 6, retrorsly barbed. 
8. Scirpus lacustris, Linn. Sp. Pl. 48. S. lacustris occident- 
alis, Watson, Bot. Cal. 2:218. Tule. 
Culm stout, rarely obtusely 3-angled above; sheaths leafless, 
or bearing a single short, broad leaf; involucral leaf triangular 
above, 2-3 em. long; bracts of the raylets scarious; umbel com- 
pound, the numerous spikelets many-flowered, oblong-conie, 
5-10 mm. long, in ultimate sessile clusters of 2-10; scales pale 
brown, marked with fine, short, purple lines, at maturity ruf- 
ous, smooth, or pubescent on the midvein, narrowly ovate, 4-5 
mm. long, the midvein excurrent as a short upwardly barbed 
awn from the ciliolate, obtuse or emarginate apex; achenes 
lead-colored, obovoid, mucronulate, 2 mm. long, exceeding the 
bristles. 
Very common in swamps of the Cismontane region, often 
covering large areas; it ascends the San Bernardino Mts. to 
7,400 ft. alt., and also occurs infrequently in the marshes of the 
desert. Witch Creek and Sweetwater Valleys, San Diego Co.; 
Alderson. Orange; Mrs. M. F. Bradshaw. Newport, Long 
Beach, Oceanside, San Bernardino; Parish. Bluff Lake, San 
Bernardino Mts.; Miss Nora Pettibone. Throughout North 
America. 
There appear to be no sufficient characters to separate the 
California plants from the species. 
++ ++ Secondary involucral leaves mostly more than one, euther 
pungent, or short and grass-like, bristles 4. short-plumose. 
9. Scirpus Tatora, Kunth. Enum. 2:166. Watson, Bot. Cal. 
2:218. SS. Californicus, Britton, Trans. N. Y. Acad. 11:79. 
Britis or Me 1267: 
Culms stout, 2-3 m. tall; umbel diffuse, deecompound; pri- 
mary rays flattened, up to 3 dm. lone: involucels of the second- 
ary rays grass-like or scarious, those of the ultimate raylets 
scarious; spikelets numerous, in sessile clusters of 2-4, or soli- 
tary, oblong-conic, 1 em. long; scales brown or fuscous, smooth, 
