Botanical print from Manual of Botany of the Northern United States, Asa Gray, 1889. Plate I, Genera of Cyperacea
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EXPLANATION OF PLATE I CYPERUS.—(1) Small plant of C. diandrus; (2) a spikelet magnified; (3) a piece of the rhachis with one scale enclosing its flower; (4) a separate flower more magnified.—(5) C. erythrorhizos, a spikelet magnified; the lower scales and flowers have fallen, showing the small internal scales of the section Papyrus, formed of the winged margins of the joints of the rhachis detached; (6) a separate one, more enlarged; (7) a flower; (8) an achene, cut in two.—(9) C. dentatus, a piece of the rhachis of a spike with the lower part of one scale, showing how it is decurrent on the joint beneath (cut across) to form scale-like wings. DULICHIUM.—(1) Upper part of a plant of D. spathaceum; (2) part of a spikelet somewhat enlarged; (3) piece of rhachis, and one scale decurrent on the joint beneath; (4) magnified flower. KYLLINGA.—(1) Plant of K. pumila; (2) one-flowered spikelet on a piece of the rhachis enlarged; (3) the same, more enlarged and open; (4) achene; and (5) section of same magnified.