GRAMIXEAE (GRASS FAMILY) 119 



rhachis villous; bristles slender, vpv'arcVy barbed, ustially 7-12 mm. long :^ 

 spikelets 2 mm. long ; second duine and sterile lemma equal, covering the obtus( 

 striate faintly wrinkled fertile lemma. — Cultivated grounds and 

 waste places, throughout. (Nat. from Eu.) Fig. 71. Var. hre- 

 YisETA (Doll) Hitchc. Bristles scarcely longer than the spikelets. — 

 Sterile soil, n. Me. and adjacent Que. 



5. S. iTALicA (L.) Beauv. Annual; panicle compound, inter- 

 rupted at base, thick, nodding, 8-20 cm. long, but in escaped speci- 

 mens smaller, yellowish or purplish ; bristles 2 or 3 in a cluster, 

 longer than the spikelets. — Cultivated under the name of Millet, 

 German Millet, or Huxgariax Grass, and rarely spontaneous, as 

 is also Var. germanica (Mill.) Richter, Goldex-Woxder Millet, -^ 5, ^....,. 



-which is more slender and has bristles shorter than the spikelets. Spikeletx4* 

 (Introd. from Eu.) 



6. S. magna Griseb. Probably perennial ; culm stout, erect, 1-3 m. high ; 

 sheaths loose, spreading, compressed, margins densely ciliate near the summit ; 

 blades 3-6 dm. long, 1-3 cm. v:ide, attenuate, scabrous; panicles usually inter- 

 rupted below, 2-5 cm. thick, tapering to both ends; rhachis densely pilose; 

 bristles 8-11 mm. long, upwardly scabrous; spikelets 2 mm. long; first glume 

 broad, about ^ as long as the second, which equals the sterile lemma and with 

 it covers the acute apiculate smooth and shining (not striate nor rugose) fertile 

 lemma. — Low grounds and marshes, Del., Ya., and south w. (Trop. Am.) 



15. CENCHRUS L. Sandbur. Bur Grass 



Spikelets 1 -flowered, acuminate, 2-6 together, subtended by a short-pediceled 

 ovoid or globular involucre of rigid connate spines which is deciduous with them 

 at maturity ; glumes shorter than the lemmas ; sterile lemma with a hyaline 

 palea, fertile lemma and palea less indurated than in Panicum, falcate-acuminate, 

 the lemma not inrolled at the margins. — Our species annual, with simple racemes 

 of spiny burs terminating the culm and branches. (An ancient Greek name of 

 Setaria italica.) 



1. C. carolinianus Walt. Cidms flattened, much branched, ascending or 

 spreading, ;>-8 dm. long; leaves flat ; racemes of 8-20 involucres, about S mm. 



thick, the 6-8 pubescent divisions spine-pointed, 

 spines spreading or reflexed ; spikelets 2-3. ( C. 

 tribuloides Am. auth., not L.) — Sandy soil, on river 

 banks, etc., s. Me. to Fla., and westw. across the 

 continent. Aug. (Trop. regions.) Fig. 72. 



2. C. tribuloides L. Culms more robust, often 



72 c carolinianus X 11/2 extensively branching or trailing, 3-9 dm. long; 



Closed involucre, at left Lon?i- f^heaths loose, Usually hirsute along the margins, 



tudinalsection'of same, at right, hgule conspicuously ciliate ; blades more or less 



Open spikelet, in middle. involute; racemes usually included at the base; 



involucres 12-14 mm. thick, densely long-pubescent ; 

 the stout spines spreading or ascending. (C. macrocephalus Scribn.) — Sands 

 along the coast, N.J. and southw. 



16. ZIZANIA [Gronov.] L. Water or Indian Rice 



Spikelets unisexual, 1-flowered. the pistillate linear, awned, articulated and 

 tardily deciduous on club-shaped pedicels on the appressed upper branches, 

 the staminate lanceolate, early deciduous, on the expanded lower branches of 

 the same panicle ; glumes none in the pistillate spikelet ; lemma closely clasp- 

 ing the palea by a pair of strong lateral nerves, a long hispid awn from the sum- 

 mit ; first glume of staminate spikelet 5-, the second 3 nerved ; stamens 6 ; grain 

 cylindrical, l.;')-2 cm. long, closely enveloped in the membranaceous lemma and 

 3-nerved i)alea. — A tall aquatic gra.^s with long leaves and large tenuMial pani- 

 cles. (Adapted from fifdnoj', the ancient name of some wild grain.) 



