. Gray's new manual of botany. A handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada. Botany. T. E. arvense. Crose- Bection of stem x 12. in threes ; centrum J eter.—Alluvial soil, N. S. and Que. to Alaska, southw. to w. Mass., N. J., and la., chiefly in calcareous re- gions. April, May. (Eurasia.) Figs. 8,9. 3. E. sylviticum L. Stems dm. high; both kinds developing com- pound branches; centrum half the diameter ; ridges 8-14, flat, with a row of recurved spinules on each side; sheaths green, with the papery brown teeth coherent;
. Gray's new manual of botany. A handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada. Botany. T. E. arvense. Crose- Bection of stem x 12. in threes ; centrum J eter.—Alluvial soil, N. S. and Que. to Alaska, southw. to w. Mass., N. J., and la., chiefly in calcareous re- gions. April, May. (Eurasia.) Figs. 8,9. 3. E. sylviticum L. Stems dm. high; both kinds developing com- pound branches; centrum half the diameter ; ridges 8-14, flat, with a row of recurved spinules on each side; sheaths green, with the papery brown teeth coherent; primary branches 4-5-angled, the secondary 3-ang1ed. - (Common H.) Fertile stems dm. high, with loose 8-12-toothed sheaths, not rarely developing a few branches in wet places; sterile stems prostrate or erect, dm. high, 10-14-furrowed, variously branched; silex in punctiform dots; branches 3-4-angled, mostly simple, solid, winged, the teeth of their sheaths triangu- lar-lanceolate, with sharp erect acuminate points; root- stocks tuberiferous, felted; centrum ^-| the total diameter of the stem. — Common. (Widely distr.) Fig. 7. 2. E. prat^nse Ehrh. Sterile and finally fertile stems developing simple horizontal triangular branches whose first in tern odes do not exceed the stem-sheaths; teeth of branch-sheaths deltoid, acute; stems 2-3 dm. high, 8-20-ridged,.beset with flat spines of silex, arranged the total diam-. E. pratense. Cross-section of stem X 12. 9. E. pratense. Epi- dermis Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gray, Asa, 1810-1888; Robinson, Benjamin Lincoln, 1864-1935; Fernald, Merritt Lyndon, 1873-1950. New York, American Book Co
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