A text-book of grasses with especial reference to the economic species of the United States . PANICE^ 187 222. Cenchrus L.—Sand-bur. Bur-grass. Low oftenweedy grasses, usually annuals, the spikelets, singlyor 2 or 3 together, inclosed by a bur formed ofcoalesced bristles or branchlets, theseusually retrorselybarbed. The burs areborne in a spike orraceme, and, detach-ing easily at maturity,are transported byanimals. The spikeletsremain permanentlyinclosed in the bur,germination of theseed taking placewithin it. The firstglume is much re-duced, sometimeswanting. The com-mon sand-bur of theUnited
A text-book of grasses with especial reference to the economic species of the United States . PANICE^ 187 222. Cenchrus L.—Sand-bur. Bur-grass. Low oftenweedy grasses, usually annuals, the spikelets, singlyor 2 or 3 together, inclosed by a bur formed ofcoalesced bristles or branchlets, theseusually retrorselybarbed. The burs areborne in a spike orraceme, and, detach-ing easily at maturity,are transported byanimals. The spikeletsremain permanentlyinclosed in the bur,germination of theseed taking placewithin it. The firstglume is much re-duced, sometimeswanting. The com-mon sand-bur of theUnited States is Cen-chrus carolinianusWalt. (Fig. 27). Theone with larger bursfound among the sand-dunes of the Atlanticseacoast is L. 223. StenotaphrumTnw.—The best-known species of this Fiq. 27. Cenchrus carolinianus. Upper , _, portion of plant with inflorescence, X%; genus IS the St. spikeiet, 188 A TEXT-BOOK OF GRASSES Augustine grass, S. secundatiim (Walt.) Kuntze (Fig. 28),a stoloniferous perennial with flat stems and spikes, thespikelets partly immersed in the thickened rachis. Thisspecies is grown as a lawn-grass near the seacoast fromNorth Carolina to Florida and Louisiana.
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Keywords: ., bookauthorhi, bookcentury1900, bookdecade1910, booksubjectgrasses
