88 GRAMINEAE 



Introduced from the Old "World. Occasional from Santa Barbara southward 

 along the coast. A valuable forage grass but having a tendency to become a 



troublesome weed. 



Locs. Santa Barbara, Chase 5612; Pasadena, Grant 4133; Santa Ana, Abrams 1765; 

 Escondido, Chandler 5351. 



Kefs. HOLCUS HALEPENSIS L. Sp. PL 1047. 1753. Andropogon halepensis Brot. Fl. Lusit. 

 1: 89. 1804. A. sorghum, Brot. var. halepensis Hack, in DC. Monogr. Phan. 6: 502. 1889; 

 Davy in Jepson, FL W. Mid. Cal. 29. 1901. Sorghum halepense Pers. Syn. 1: 101. 1805; 

 Abrams, Fl. Los Ang. 21. 1904. 



3. ANDROPOGON L. 



Spikelets in pairs (or the terminal in 3's) at each joint of the articulate and 

 usually hairy rachis, one sessile, perfect, 1-flowered, the other pedicellate, stam- 

 inate, neutral, or reduced to a pedicel. Glumes of fertile spikelet 2, the first 

 more or less indurated, flattened on the back, with 2 prominent nerves near 

 the margin, the central less prominent, the second glume as long as the first, 

 keeled. Sterile and fertile lemmas hyaline, the latter awned. Palea minute or 

 wanting. Annual or perennial, usually coarse grasses with terminal and often 

 axillary inflorescence of one to many spikes. Species numerous, probably 

 about 200, widely distributed in both hemispheres, except the colder regions. 

 (Greek, aner, man, and pogon, beard, referring to the hairy rachis.) 



1. A. barbinodis Lag. Culms tufted, erect or somewhat spreading at base, 

 2 to 4 feet high, glabrous except the densely ascending-hispid nodes; sheaths 

 glabrous; blades iy 2 to 3 lines wide, flat, scabrous above, the upper much 

 reduced ; panicle 2 to 3 inches long, consisting of several appressed or ascending 

 silky-white racemes, somewhat flabellately aggregated near the summit of the 

 culm; glumes of sessile spikelet 2y 2 lines long, the awn about 10 lines long, 

 geniculate at the middle, tightly twisted below the bend, loosely twisted above. 



Dry hills from Santa Barbara to San Diego, east to New Mexico and south 

 into Mexico. 



Locs. Santa Barbara, Elmer 3760; Los Angeles, Grant 3461; Santa Monica Mts., Abrams 

 3110; Santa Catalina Island, Trask; San Diego, BaTcer 3406. 



Eefs. ANDROPOGON BARBINODIS Lag. Gen. & Sp. Nov. 3. 1816. A. saccharoides [Swartz, 

 misapplied by] Abrams, Fl. Los Ang. 21. 1904. 



TRIBE II. ZOYSIEAE. 

 4. PLEURAPHIS Torr. 



Spikelets in 3's at each joint of the inarticulate rachis, villous at base, all sessile 

 and falling off together. Central spikelet 1-flowered, perfect ; glumes 2, the sum- 

 mit cleft into several awn-like divisions. Lateral spikelets staminate, 1 or 2- 

 flowered. Perennial, wiry or woody grasses with creeping rhizomes and terminal 

 spikes. Species 3, in the Sonoran region. (Greek pleura, side, and raphis, needle, 

 referring to the awn on the side of the glume in the type species, P. jamesii.) 



Culms felty-pubescent 1. P. rigida. 



Culms glabrous or slightly puberulent 2. P. jamesii. 



1. P. rigida Thurb. Culms numerous, felty-pubescent, glabrate and sca- 

 brous above, 1% to 3 feet high ; leaves felty or glabrous, usually woolly around 

 the top of the sheath; blades 1 to 2 inches long, or longer on sterile shoots, 

 1 to 2 lines wide, more or less involute, acuminate into a rigid coriaceous point ; 

 spikelets about 4 lines long; glumes of central spikelet broadened upward 

 from a narrow base, woolly-ciliate, several-awned from the tip, a stronger 

 dorsal awn from about the middle ; lemma 3-nerved, enclosing the palea and a 

 rudimentary second floret, the nerves villous on the back, extending into deli- 



