No. 20. 
SPOROBOLUS WRIGHTII Munro in Herb. | 
Plant perennial, coarse, with thickened bulbous base. 
Culms erect, not branching, terete, smooth and shining, 2 to 4 feet tall. 
Leaves; radical, few, scarious sheaths at maturity; of culm 4 or 5; sheaths 
mostly exceeding internodes, closed, slightly hairy at the throat; blades flat or 
involute, 2 or 3 lines wide, 1 to 2 feet long; ligule a minute fringe. 
Inflorescence a slender, erect, lanceolate panicle, 10 to 13 inches long; branches 
mostly alternate, slender, erect-spreading, | to 4 inches long, bearing many shortly- 
pedicellate spikelets on the outer two-thirds. 
Spikelets lanceolate, 1-flowered, 1 line long; first glume ovate, barely acute, — 
membranaceous, 1-nerved, + to $ line long; second glume same, but twice as large; 
floral glume broadly lanceolate, acute, membranaceous, smooth, 1-nerved, ? line 
long; palet lanceolate, cleft at apex, slightly 2-keeled, } line long. 
Grain elliptical, compressed, brown, 4 line long. 
Puate XX; a, spikelet enlarged. : 
A tall coarse grass, growing in dense tufts, commonly called Saccaton or Zac- 
ate. Probably too coarse to be of agricultural value. 
Western Texas to southern California, 
