Studies on Nutgrass (Cyperus Rotundus L.) And Its Control (Classic Reprint)

Excerpt from Studies on Nutgrass (Cyperus Rotundus L.) And Its Control

The nutgrass plant has been described as consisting Of an under ground system Of roots, tubers, basal bulbs, and connecting rhizomes, and aboveground of rosettes of leaves and umbel-bearing scapes (39) At the junction of the rhizome and leaves, a tuberous enlargement develops, which is termed a basal bulb. A diagram Of the. Plant is shown in figure 1.

There is a close resemblance in structure between the tuber and rhi zome. Buds and scale leaves are present on both the young rhizome and tuber; they are lost on the mature rhizome but persist on the tuber. The mature rhizome is a black, wiry strand about mm. In diameter that appears lifeless to the naked eye.

The basal bulb is a stemlike structure consisting Of a closely ap pressed series Of leaves, sheathing and arising from a tuberous base, and connected to the tubers by a rhizome. It is probable that all buds give rise to rhizomes, some only a millimeter or two long, others several centimeters long. The rhizome may terminate in a basal bulb or a tuber.

The leaves are linear in shape, Of the grass-sedge type, about 4 to 5 mm. In width, and up to 40 cm. Long. The flower is an inconspicuous panicle that seldom bears fertile seeds. The fruit is an achene. Al though each plant is small and seldom bears more than 10 leaves, it may, under favorable growing conditions, form a dense carpet on the soil. The plant gets its common name from the nuts or under ground tubers which sometimes grow very thickly. In fact, Over tubers have been found in a cubic foot Of Puerto Rican soil.

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