368 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
distant, ascending or appressed; pedicels slender, 3 to 5 mm. long, enlarged and 
pubescent toward the recurved tip; spikelets with one perfect floret, racemose, more 
or less secund along the main branches, shining white, 7 to 8 mm. long; first glume 
as long as the spikelet, oblong, obtuse, 5-nerved, the nerves anastomosing above, 
thin, the broad margin white and papery, infolding the base of the spikelet, flattened 
above, minutely scabrous; second glume similar to the first, somewhat narrower, 
3-nerved; lemma about as long as the glumes, narrower, firm except the obtuse scari- 
ous summit, many-nerved, the nerves not extending into the summit, tuberculate- 
roughened, bearing a group of flat, lax, twisted hairs toward the middle of each margin; 
palea shorter than the lemma, not scarious, the keels minutely ciliate above; rudiment 
oblong-cuneate, truncate, 2 to 3 mm. long, the stipe about as long. 
Type in the U. 8. National Herbarium, no. 691233, collected in ‘Shaded places, 
Santa Eulalia Mountains, Chihuahua,’’ Mexico, April 6, 1885, by ©. G. Pringle 
(no. 430). 
RanGeE: Mountains of northern Mexico. 
HERBARIUM SPECIMENS: 
Cuinuanua: Santa Eulalia Mountains, shaded places, Pringle 430. Chihuahua, 
Wilkinson 342. 
Coanuita: Sierra Mojada Mountains, Jones 482. San Lorenzo Canyon, Palmer 
551 in 1905. 
4. Melica frutescens Scribn. Proc. Acad. Phila. 1885: 45. pl. 1. f. 15, 16. 1886. 
Type locality, ‘Southern California,’’ the type specimen collected in the vicinity 
of San Diego by Parry and Lemmon (no. 401). 
RANGE: Coast Ranges, southern California and Lower California. 
HERBARIUM SPECIMENS FROM MExIco: 
Lower Cauirornia: Carysito, Orcutt 513. El Rancho Viejo, Brandegee 15 in 
1889. Near Tifa Juana, Jones 3748. 
111. SENITES Adans. Fam. PI. 2: 39, 604. 1763. 
KEY TO THE SPECIES. 
Blades oblong-lanceolate, over 10 cm. long. 
Spikelets nodding on capillary pedicels; petiole densely 
villous. ... 2.2.2... 222222222 eee eee eee eee 2. S. capillaris. 
Spikelets erect on short pedicels; petiole glabrate or sparse- 
ly pubescent. . 
Panicle densely flowered, the branches ascending; 
blades mostly 5 to 6 cm. wide, lanceolate... ... 1. &. latifolia. 
Panicle loosely flowered, the branches spreading; 
blades narrower, oblong-lanceolate...... we eeeeee la. S. latifolia pring- 
lei. 
Blades ovate. 
Blades about 10 cm. long, 7 to 8 cm. wide................. 3. S. smilacifolia. 
Blades 2 to 4 cm. long. 
Spikelets awned.............-....0.020202020200002. 4. S. pringlet. 
Spikelets awnless.........2..2022.0200-0 20. 00ee cece eee 5. S. mexicana. 
1. Senites latifolia (Fourn.). 
Krombholzia latifolia Fourn. Bull. Soc. Bot. Belg. 15: 463. 1876. 
Zeugites latifolia Hemsl. Biol. Centr. Amer. Bot. 3: 577. 1885. 
Zeugites pitttert Hack. Oesterr. Bot. Zeitschr. 52: 373. 1902. 
Type locality, ‘‘Dolores,’’ Oaxaca, the type specimen collected by Liebmann 
(no. 541). 
