horny, centrally-grooved, white-margined base, narrower than the 

 leaf, the tips soon incurving, the whole forming a narrow black 

 and white limb to the sheath. 



Uppermost sheath broadly campanulate ; spike included or a 

 little exserted, rounded at top, not apiculate as in the rest of the 

 sub-genus. Central cavity occupying four-fifths the diameter of 

 the stem, but not so wide as laevigatum; carinal and valle* 

 cular small and at times obsolete for a short distance, the inner 

 points of carinal and vellecular bast about equidistant from the 

 central cavity, the green parenchyma continuous under both cari- 

 nal and vallecular bast, the internal arrangement being similar to 

 ramosissimum. Parenchyma of sheaths in an oblong mass over 

 the blast, which occupies the place of the carinal cavity. 



Similar to both laevigatum and ramosissimum and naturally 

 comes between them. Differs from the former, with which it is 

 most likely to be confounded in its extreme roughness, shorter 

 sheaths, prominently incurved bases of the teeth, the stomata 

 often in two rows, the stem walls thicker and the green paren- 

 chyma contiuous. The carinal blast equals the vallecular, the 

 green parenchyma of the sheaths is massed, and the sheaths in 

 section are prominently 3-angled. 



This species has been collected under the following forms : 



1. Caespitosum. Stems up to 10 inches high, small, erect or 

 prostrate, usually persisting over winter, sometimes 100 in a 

 cluster, very rough ; teeth persistent, becoming white ; bases at 

 first variegated black and white, finally fading to white. Leaves 

 rounded on the back. Resembles laevigatum variegatoidcs. 

 Wash of the Santa Ana River 2 miles west of San Bernardino, 

 December 27, 1890. Coville and Funston, No. 13; Parish 16,668c. 

 National City, Calif., Miss L. F. Kimball. 



2. Nudum. Stems 1 to 2 feet high, about 20-angled, erect, 

 naked. The common form with aspect of laevigatum. San Ber- 

 nardino Coville and Funston, No. 13 (B. robustum Cont. Nat. 

 Herb. IV, 226). San Bernardino, Parish 2,058 and 16,668. One 

 mile east of San Bernardino, Coville and Funston, No. 27 as B. 

 variegatum 1. c) ; Pasadena Parish, National City, Cal. Miss Kim- 

 ball. Panamint Valley Coville and Funston, 689 as B. variegatum 

 1. c. (Somewhat variant; Johnson Canyon, Panamint Mts., 



