Echinochloa Colona (L.) Link (Poaceae)

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ISTA Universal List Echinochloa colona (L.) Link (Poaceae) SPIKELET ©2013 California Department of Food & Agriculture One sterile floret and one fertile floret, disarticulation below the glumes, falling as a unit from the plant General shape: elliptic or ovate to round; dorsal- 4 ventrally compressed, dorsal side arched and ventral side flat (D-shaped in profile view) Normal size: 2.0 – 3.0 mm long x 1.0 – 1.5 mm wide Color: Pale green to straw-colored, +/- with purple tinge 2 Texture: glumes and sterile floret membranous to 1 papery, surface +/- with soft short hairs, veins +/- 3 with short stiff hairs Distinguishing features: lower glume +/- ½ the length of the spikelet, broadly triangular, the outer 7 corners wrapping around the base of the upper glume; upper glume ovate, ca. equal to length of 5 spikelet, apex tipped with a short, sharp point; sterile floret equal to length of spikelet, unawned; palea +/- ©2013 California Department of Food & Agriculture equal in length to sterile lemma, hyaline, keels with short fine hairs 3 2 FERTILE FLORET General shape: ovate to elliptic; dorsal-ventrally compressed, dorsal side arched and ventral side flat (D-shaped in profile view) Normal size: 2.0 – 3.0 mm long Color: straw-colored to grayish-brown, +/- dark speckled, veins +/- lighter in color; palea similar in color 1 Texture: lemma and palea hardened, glabrous, Ventral view Dorsal view glossy; apex of lemma thinner and shriveled at Echinochloa colona spikelets consist of a triangular maturity lower glume (1), upper glume (2) and sterile Distinguishing features: lemma 5-veined, margins lemma (3) that are about equal in length, fertile in-rolled over margin of palea, apex tapered to a lemma (4) and fertile palea (5). point, at maturity the tip appears shriveled or laterally pinched ©2013 California Department of Food & Agriculture CARYOPSIS General shape: round to obovate, dorsal-ventrally compressed Normal size : 1.2 – 1.6 mm long x 1.0 – 1.3 mm wide 6 Color : light yellow to whitish Texture: smooth, glabrous 7 Embryo: ⅔ - ⅘ the length of the caryopsis Endosperm: solid Hilum: +/- round Caryopsis in dorsal view showing embryo (6) and ventral view showing hilum (7). Description by Deborah Meyer California Department of Food & Agriculture Images by Jim Effenberger & Deborah Meyer Page 1 of 1.

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Cytotaxonomy of the Genus Echinochloa in Louisiana. James Howard Brooks Louisiana State University and Agricultural & Mechanical College
Louisiana State University LSU Digital Commons LSU Historical Dissertations and Theses Graduate School 1969 Cytotaxonomy of the Genus Echinochloa in Louisiana. James Howard Brooks Louisiana State University and Agricultural & Mechanical College Follow this and additional works at: https://digitalcommons.lsu.edu/gradschool_disstheses Recommended Citation Brooks, James Howard, "Cytotaxonomy of the Genus Echinochloa in Louisiana." (1969). LSU Historical Dissertations and Theses. 1640. https://digitalcommons.lsu.edu/gradschool_disstheses/1640 This Dissertation is brought to you for free and open access by the Graduate School at LSU Digital Commons. It has been accepted for inclusion in LSU Historical Dissertations and Theses by an authorized administrator of LSU Digital Commons. For more information, please contact [email protected]. This dissertation has been microfilmed exactly as received 70-9040 BROOKS, James Howard, 1932- CYTOTAXONOMY OF THE GENUS ECHINOCHLOA i IN LOUISIANA. j The Louisiana State University and Agricultural and Mechanical College, Ph.D., 1969 Agronomy University Microfilms, Inc., Ann Arbor, Michigan CYTOTAXONOMY OF THE GENUS ECHINOCHLOA IN LOUISIANA A Dissertation Submitted to the Graduate Faculty of the Louisiana State University Agricultural and Mechanical College in partial fulfillment of the requirements for the degree of Doctor of Philosophy in The Department of Botany and Plant Pathology by James Howard Brooks B.S., Stephen F. Austin State College, 1957 M .S., Stephen F. Austin State College, 1964 ACKNOWLEDGEMENTS The author wishes to express his sincere appreciation to Dr. Clair A. Brown for serving as chairman of his committee, for aid in selecting the problem, guidance throughout the study, and helpful suggestions for improving the manuscript and companionship during some of the collecting trips.
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